We should write transformed instruction encoding of the trapped
instruction in [m|h]tinst CSR at time of taking trap as defined
by the RISC-V privileged specification v1.12.
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
---
target/riscv/cpu_helper.c | 210 +++++++++++++++++++++++++++++++++++++-
target/riscv/instmap.h | 43 ++++++++
2 files changed, 249 insertions(+), 4 deletions(-)
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index d99fac9d2d..2a2b6776fb 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -22,6 +22,7 @@
#include "qemu/main-loop.h"
#include "cpu.h"
#include "exec/exec-all.h"
+#include "instmap.h"
#include "tcg/tcg-op.h"
#include "trace.h"
#include "semihosting/common-semi.h"
@@ -1316,6 +1317,200 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
return true;
}
+
+static target_ulong riscv_transformed_insn(CPURISCVState *env,
+ target_ulong insn)
+{
+ bool xinsn_has_addr_offset = false;
+ target_ulong xinsn = 0;
+
+ /*
+ * Only Quadrant 0 and Quadrant 2 of RVC instruction space need to
+ * be uncompressed. The Quadrant 1 of RVC instruction space need
+ * not be transformed because these instructions won't generate
+ * any load/store trap.
+ */
+
+ if ((insn & 0x3) != 0x3) {
+ /* Transform 16bit instruction into 32bit instruction */
+ switch (GET_C_OP(insn)) {
+ case OPC_RISC_C_OP_QUAD0: /* Quadrant 0 */
+ switch (GET_C_FUNC(insn)) {
+ case OPC_RISC_C_FUNC_FLD_LQ:
+ if (riscv_cpu_xlen(env) != 128) { /* C.FLD (RV32/64) */
+ xinsn = OPC_RISC_FLD;
+ xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
+ xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
+ xinsn = SET_I_IMM(xinsn, GET_C_LD_IMM(insn));
+ xinsn_has_addr_offset = true;
+ }
+ break;
+ case OPC_RISC_C_FUNC_LW: /* C.LW */
+ xinsn = OPC_RISC_LW;
+ xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
+ xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
+ xinsn = SET_I_IMM(xinsn, GET_C_LW_IMM(insn));
+ xinsn_has_addr_offset = true;
+ break;
+ case OPC_RISC_C_FUNC_FLW_LD:
+ if (riscv_cpu_xlen(env) == 32) { /* C.FLW (RV32) */
+ xinsn = OPC_RISC_FLW;
+ xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
+ xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
+ xinsn = SET_I_IMM(xinsn, GET_C_LW_IMM(insn));
+ xinsn_has_addr_offset = true;
+ } else { /* C.LD (RV64/RV128) */
+ xinsn = OPC_RISC_LD;
+ xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
+ xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
+ xinsn = SET_I_IMM(xinsn, GET_C_LD_IMM(insn));
+ xinsn_has_addr_offset = true;
+ }
+ break;
+ case OPC_RISC_C_FUNC_FSD_SQ:
+ if (riscv_cpu_xlen(env) != 128) { /* C.FSD (RV32/64) */
+ xinsn = OPC_RISC_FSD;
+ xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
+ xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
+ xinsn = SET_S_IMM(xinsn, GET_C_SD_IMM(insn));
+ xinsn_has_addr_offset = true;
+ }
+ break;
+ case OPC_RISC_C_FUNC_SW: /* C.SW */
+ xinsn = OPC_RISC_SW;
+ xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
+ xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
+ xinsn = SET_S_IMM(xinsn, GET_C_SW_IMM(insn));
+ xinsn_has_addr_offset = true;
+ break;
+ case OPC_RISC_C_FUNC_FSW_SD:
+ if (riscv_cpu_xlen(env) == 32) { /* C.FSW (RV32) */
+ xinsn = OPC_RISC_FSW;
+ xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
+ xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
+ xinsn = SET_S_IMM(xinsn, GET_C_SW_IMM(insn));
+ xinsn_has_addr_offset = true;
+ } else { /* C.SD (RV64/RV128) */
+ xinsn = OPC_RISC_SD;
+ xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
+ xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
+ xinsn = SET_S_IMM(xinsn, GET_C_SD_IMM(insn));
+ xinsn_has_addr_offset = true;
+ }
+ break;
+ default:
+ break;
+ }
+ break;
+ case OPC_RISC_C_OP_QUAD2: /* Quadrant 2 */
+ switch (GET_C_FUNC(insn)) {
+ case OPC_RISC_C_FUNC_FLDSP_LQSP:
+ if (riscv_cpu_xlen(env) != 128) { /* C.FLDSP (RV32/64) */
+ xinsn = OPC_RISC_FLD;
+ xinsn = SET_RD(xinsn, GET_C_RD(insn));
+ xinsn = SET_RS1(xinsn, 2);
+ xinsn = SET_I_IMM(xinsn, GET_C_LDSP_IMM(insn));
+ xinsn_has_addr_offset = true;
+ }
+ break;
+ case OPC_RISC_C_FUNC_LWSP: /* C.LWSP */
+ xinsn = OPC_RISC_LW;
+ xinsn = SET_RD(xinsn, GET_C_RD(insn));
+ xinsn = SET_RS1(xinsn, 2);
+ xinsn = SET_I_IMM(xinsn, GET_C_LWSP_IMM(insn));
+ xinsn_has_addr_offset = true;
+ break;
+ case OPC_RISC_C_FUNC_FLWSP_LDSP:
+ if (riscv_cpu_xlen(env) == 32) { /* C.FLWSP (RV32) */
+ xinsn = OPC_RISC_FLW;
+ xinsn = SET_RD(xinsn, GET_C_RD(insn));
+ xinsn = SET_RS1(xinsn, 2);
+ xinsn = SET_I_IMM(xinsn, GET_C_LWSP_IMM(insn));
+ xinsn_has_addr_offset = true;
+ } else { /* C.LDSP (RV64/RV128) */
+ xinsn = OPC_RISC_LD;
+ xinsn = SET_RD(xinsn, GET_C_RD(insn));
+ xinsn = SET_RS1(xinsn, 2);
+ xinsn = SET_I_IMM(xinsn, GET_C_LDSP_IMM(insn));
+ xinsn_has_addr_offset = true;
+ }
+ break;
+ case OPC_RISC_C_FUNC_FSDSP_SQSP:
+ if (riscv_cpu_xlen(env) != 128) { /* C.FSDSP (RV32/64) */
+ xinsn = OPC_RISC_FSD;
+ xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
+ xinsn = SET_RS1(xinsn, 2);
+ xinsn = SET_S_IMM(xinsn, GET_C_SDSP_IMM(insn));
+ xinsn_has_addr_offset = true;
+ }
+ break;
+ case OPC_RISC_C_FUNC_SWSP: /* C.SWSP */
+ xinsn = OPC_RISC_SW;
+ xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
+ xinsn = SET_RS1(xinsn, 2);
+ xinsn = SET_S_IMM(xinsn, GET_C_SWSP_IMM(insn));
+ xinsn_has_addr_offset = true;
+ break;
+ case 7:
+ if (riscv_cpu_xlen(env) == 32) { /* C.FSWSP (RV32) */
+ xinsn = OPC_RISC_FSW;
+ xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
+ xinsn = SET_RS1(xinsn, 2);
+ xinsn = SET_S_IMM(xinsn, GET_C_SWSP_IMM(insn));
+ xinsn_has_addr_offset = true;
+ } else { /* C.SDSP (RV64/RV128) */
+ xinsn = OPC_RISC_SD;
+ xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
+ xinsn = SET_RS1(xinsn, 2);
+ xinsn = SET_S_IMM(xinsn, GET_C_SDSP_IMM(insn));
+ xinsn_has_addr_offset = true;
+ }
+ break;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ /*
+ * Clear Bit1 of transformed instruction to indicate that
+ * original insruction was a 16bit instruction
+ */
+ xinsn &= ~((target_ulong)0x2);
+ } else {
+ /* No need to transform 32bit (or wider) instructions */
+ xinsn = insn;
+
+ /* Check for instructions which need address offset */
+ switch (MASK_OP_MAJOR(insn)) {
+ case OPC_RISC_LOAD:
+ case OPC_RISC_STORE:
+ case OPC_RISC_ATOMIC:
+ case OPC_RISC_FP_LOAD:
+ case OPC_RISC_FP_STORE:
+ xinsn_has_addr_offset = true;
+ break;
+ case OPC_RISC_SYSTEM:
+ if (MASK_OP_SYSTEM(insn) == OPC_RISC_HLVHSV) {
+ xinsn_has_addr_offset = true;
+ }
+ break;
+ }
+ }
+
+ if (xinsn_has_addr_offset) {
+ /*
+ * The "Addr. Offset" field in transformed instruction is non-zero
+ * only for misaligned load/store traps which are very unlikely on
+ * QEMU so for now always set "Addr. Offset" to zero.
+ */
+ xinsn = SET_RS1(xinsn, 0);
+ }
+
+ return xinsn;
+}
#endif /* !CONFIG_USER_ONLY */
/*
@@ -1340,6 +1535,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
target_ulong cause = cs->exception_index & RISCV_EXCP_INT_MASK;
uint64_t deleg = async ? env->mideleg : env->medeleg;
target_ulong tval = 0;
+ target_ulong tinst = 0;
target_ulong htval = 0;
target_ulong mtval2 = 0;
@@ -1355,18 +1551,22 @@ void riscv_cpu_do_interrupt(CPUState *cs)
if (!async) {
/* set tval to badaddr for traps with address information */
switch (cause) {
- case RISCV_EXCP_INST_GUEST_PAGE_FAULT:
case RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT:
case RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT:
- case RISCV_EXCP_INST_ADDR_MIS:
- case RISCV_EXCP_INST_ACCESS_FAULT:
case RISCV_EXCP_LOAD_ADDR_MIS:
case RISCV_EXCP_STORE_AMO_ADDR_MIS:
case RISCV_EXCP_LOAD_ACCESS_FAULT:
case RISCV_EXCP_STORE_AMO_ACCESS_FAULT:
- case RISCV_EXCP_INST_PAGE_FAULT:
case RISCV_EXCP_LOAD_PAGE_FAULT:
case RISCV_EXCP_STORE_PAGE_FAULT:
+ write_gva = env->two_stage_lookup;
+ tval = env->badaddr;
+ tinst = riscv_transformed_insn(env, env->bins);
+ break;
+ case RISCV_EXCP_INST_GUEST_PAGE_FAULT:
+ case RISCV_EXCP_INST_ADDR_MIS:
+ case RISCV_EXCP_INST_ACCESS_FAULT:
+ case RISCV_EXCP_INST_PAGE_FAULT:
write_gva = env->two_stage_lookup;
tval = env->badaddr;
break;
@@ -1448,6 +1648,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
env->sepc = env->pc;
env->stval = tval;
env->htval = htval;
+ env->htinst = tinst;
env->pc = (env->stvec >> 2 << 2) +
((async && (env->stvec & 3) == 1) ? cause * 4 : 0);
riscv_cpu_set_mode(env, PRV_S);
@@ -1478,6 +1679,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
env->mepc = env->pc;
env->mtval = tval;
env->mtval2 = mtval2;
+ env->mtinst = tinst;
env->pc = (env->mtvec >> 2 << 2) +
((async && (env->mtvec & 3) == 1) ? cause * 4 : 0);
riscv_cpu_set_mode(env, PRV_M);
diff --git a/target/riscv/instmap.h b/target/riscv/instmap.h
index 40b6d2b64d..f564a69d90 100644
--- a/target/riscv/instmap.h
+++ b/target/riscv/instmap.h
@@ -184,6 +184,8 @@ enum {
OPC_RISC_CSRRWI = OPC_RISC_SYSTEM | (0x5 << 12),
OPC_RISC_CSRRSI = OPC_RISC_SYSTEM | (0x6 << 12),
OPC_RISC_CSRRCI = OPC_RISC_SYSTEM | (0x7 << 12),
+
+ OPC_RISC_HLVHSV = OPC_RISC_SYSTEM | (0x4 << 12),
};
#define MASK_OP_FP_LOAD(op) (MASK_OP_MAJOR(op) | (op & (0x7 << 12)))
@@ -316,6 +318,12 @@ enum {
#define GET_RS2(inst) extract32(inst, 20, 5)
#define GET_RD(inst) extract32(inst, 7, 5)
#define GET_IMM(inst) sextract64(inst, 20, 12)
+#define SET_RS1(inst, val) deposit32(inst, 15, 5, val)
+#define SET_RS2(inst, val) deposit32(inst, 20, 5, val)
+#define SET_RD(inst, val) deposit32(inst, 7, 5, val)
+#define SET_I_IMM(inst, val) deposit32(inst, 20, 12, val)
+#define SET_S_IMM(inst, val) \
+ deposit32(deposit32(inst, 7, 5, val), 25, 7, (val) >> 5)
/* RVC decoding macros */
#define GET_C_IMM(inst) (extract32(inst, 2, 5) \
@@ -346,6 +354,8 @@ enum {
| (extract32(inst, 5, 1) << 6))
#define GET_C_LD_IMM(inst) ((extract16(inst, 10, 3) << 3) \
| (extract16(inst, 5, 2) << 6))
+#define GET_C_SW_IMM(inst) GET_C_LW_IMM(inst)
+#define GET_C_SD_IMM(inst) GET_C_LD_IMM(inst)
#define GET_C_J_IMM(inst) ((extract32(inst, 3, 3) << 1) \
| (extract32(inst, 11, 1) << 4) \
| (extract32(inst, 2, 1) << 5) \
@@ -366,4 +376,37 @@ enum {
#define GET_C_RS1S(inst) (8 + extract16(inst, 7, 3))
#define GET_C_RS2S(inst) (8 + extract16(inst, 2, 3))
+#define GET_C_FUNC(inst) extract32(inst, 13, 3)
+#define GET_C_OP(inst) extract32(inst, 0, 2)
+
+enum {
+ /* RVC Quadrants */
+ OPC_RISC_C_OP_QUAD0 = 0x0,
+ OPC_RISC_C_OP_QUAD1 = 0x1,
+ OPC_RISC_C_OP_QUAD2 = 0x2
+};
+
+enum {
+ /* RVC Quadrant 0 */
+ OPC_RISC_C_FUNC_ADDI4SPN = 0x0,
+ OPC_RISC_C_FUNC_FLD_LQ = 0x1,
+ OPC_RISC_C_FUNC_LW = 0x2,
+ OPC_RISC_C_FUNC_FLW_LD = 0x3,
+ OPC_RISC_C_FUNC_FSD_SQ = 0x5,
+ OPC_RISC_C_FUNC_SW = 0x6,
+ OPC_RISC_C_FUNC_FSW_SD = 0x7
+};
+
+enum {
+ /* RVC Quadrant 2 */
+ OPC_RISC_C_FUNC_SLLI_SLLI64 = 0x0,
+ OPC_RISC_C_FUNC_FLDSP_LQSP = 0x1,
+ OPC_RISC_C_FUNC_LWSP = 0x2,
+ OPC_RISC_C_FUNC_FLWSP_LDSP = 0x3,
+ OPC_RISC_C_FUNC_JR_MV_EBREAK_JALR_ADD = 0x4,
+ OPC_RISC_C_FUNC_FSDSP_SQSP = 0x5,
+ OPC_RISC_C_FUNC_SWSP = 0x6,
+ OPC_RISC_C_FUNC_FSWSP_SDSP = 0x7
+};
+
#endif
--
2.34.1On Thu, May 26, 2022 at 8:12 PM Anup Patel <apatel@ventanamicro.com> wrote:
>
> We should write transformed instruction encoding of the trapped
> instruction in [m|h]tinst CSR at time of taking trap as defined
> by the RISC-V privileged specification v1.12.
>
> Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Alistair
> ---
> target/riscv/cpu_helper.c | 210 +++++++++++++++++++++++++++++++++++++-
> target/riscv/instmap.h | 43 ++++++++
> 2 files changed, 249 insertions(+), 4 deletions(-)
>
> diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
> index d99fac9d2d..2a2b6776fb 100644
> --- a/target/riscv/cpu_helper.c
> +++ b/target/riscv/cpu_helper.c
> @@ -22,6 +22,7 @@
> #include "qemu/main-loop.h"
> #include "cpu.h"
> #include "exec/exec-all.h"
> +#include "instmap.h"
> #include "tcg/tcg-op.h"
> #include "trace.h"
> #include "semihosting/common-semi.h"
> @@ -1316,6 +1317,200 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
>
> return true;
> }
> +
> +static target_ulong riscv_transformed_insn(CPURISCVState *env,
> + target_ulong insn)
> +{
> + bool xinsn_has_addr_offset = false;
> + target_ulong xinsn = 0;
> +
> + /*
> + * Only Quadrant 0 and Quadrant 2 of RVC instruction space need to
> + * be uncompressed. The Quadrant 1 of RVC instruction space need
> + * not be transformed because these instructions won't generate
> + * any load/store trap.
> + */
> +
> + if ((insn & 0x3) != 0x3) {
> + /* Transform 16bit instruction into 32bit instruction */
> + switch (GET_C_OP(insn)) {
> + case OPC_RISC_C_OP_QUAD0: /* Quadrant 0 */
> + switch (GET_C_FUNC(insn)) {
> + case OPC_RISC_C_FUNC_FLD_LQ:
> + if (riscv_cpu_xlen(env) != 128) { /* C.FLD (RV32/64) */
> + xinsn = OPC_RISC_FLD;
> + xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
> + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> + xinsn = SET_I_IMM(xinsn, GET_C_LD_IMM(insn));
> + xinsn_has_addr_offset = true;
> + }
> + break;
> + case OPC_RISC_C_FUNC_LW: /* C.LW */
> + xinsn = OPC_RISC_LW;
> + xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
> + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> + xinsn = SET_I_IMM(xinsn, GET_C_LW_IMM(insn));
> + xinsn_has_addr_offset = true;
> + break;
> + case OPC_RISC_C_FUNC_FLW_LD:
> + if (riscv_cpu_xlen(env) == 32) { /* C.FLW (RV32) */
> + xinsn = OPC_RISC_FLW;
> + xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
> + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> + xinsn = SET_I_IMM(xinsn, GET_C_LW_IMM(insn));
> + xinsn_has_addr_offset = true;
> + } else { /* C.LD (RV64/RV128) */
> + xinsn = OPC_RISC_LD;
> + xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
> + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> + xinsn = SET_I_IMM(xinsn, GET_C_LD_IMM(insn));
> + xinsn_has_addr_offset = true;
> + }
> + break;
> + case OPC_RISC_C_FUNC_FSD_SQ:
> + if (riscv_cpu_xlen(env) != 128) { /* C.FSD (RV32/64) */
> + xinsn = OPC_RISC_FSD;
> + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
> + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> + xinsn = SET_S_IMM(xinsn, GET_C_SD_IMM(insn));
> + xinsn_has_addr_offset = true;
> + }
> + break;
> + case OPC_RISC_C_FUNC_SW: /* C.SW */
> + xinsn = OPC_RISC_SW;
> + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
> + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> + xinsn = SET_S_IMM(xinsn, GET_C_SW_IMM(insn));
> + xinsn_has_addr_offset = true;
> + break;
> + case OPC_RISC_C_FUNC_FSW_SD:
> + if (riscv_cpu_xlen(env) == 32) { /* C.FSW (RV32) */
> + xinsn = OPC_RISC_FSW;
> + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
> + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> + xinsn = SET_S_IMM(xinsn, GET_C_SW_IMM(insn));
> + xinsn_has_addr_offset = true;
> + } else { /* C.SD (RV64/RV128) */
> + xinsn = OPC_RISC_SD;
> + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
> + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> + xinsn = SET_S_IMM(xinsn, GET_C_SD_IMM(insn));
> + xinsn_has_addr_offset = true;
> + }
> + break;
> + default:
> + break;
> + }
> + break;
> + case OPC_RISC_C_OP_QUAD2: /* Quadrant 2 */
> + switch (GET_C_FUNC(insn)) {
> + case OPC_RISC_C_FUNC_FLDSP_LQSP:
> + if (riscv_cpu_xlen(env) != 128) { /* C.FLDSP (RV32/64) */
> + xinsn = OPC_RISC_FLD;
> + xinsn = SET_RD(xinsn, GET_C_RD(insn));
> + xinsn = SET_RS1(xinsn, 2);
> + xinsn = SET_I_IMM(xinsn, GET_C_LDSP_IMM(insn));
> + xinsn_has_addr_offset = true;
> + }
> + break;
> + case OPC_RISC_C_FUNC_LWSP: /* C.LWSP */
> + xinsn = OPC_RISC_LW;
> + xinsn = SET_RD(xinsn, GET_C_RD(insn));
> + xinsn = SET_RS1(xinsn, 2);
> + xinsn = SET_I_IMM(xinsn, GET_C_LWSP_IMM(insn));
> + xinsn_has_addr_offset = true;
> + break;
> + case OPC_RISC_C_FUNC_FLWSP_LDSP:
> + if (riscv_cpu_xlen(env) == 32) { /* C.FLWSP (RV32) */
> + xinsn = OPC_RISC_FLW;
> + xinsn = SET_RD(xinsn, GET_C_RD(insn));
> + xinsn = SET_RS1(xinsn, 2);
> + xinsn = SET_I_IMM(xinsn, GET_C_LWSP_IMM(insn));
> + xinsn_has_addr_offset = true;
> + } else { /* C.LDSP (RV64/RV128) */
> + xinsn = OPC_RISC_LD;
> + xinsn = SET_RD(xinsn, GET_C_RD(insn));
> + xinsn = SET_RS1(xinsn, 2);
> + xinsn = SET_I_IMM(xinsn, GET_C_LDSP_IMM(insn));
> + xinsn_has_addr_offset = true;
> + }
> + break;
> + case OPC_RISC_C_FUNC_FSDSP_SQSP:
> + if (riscv_cpu_xlen(env) != 128) { /* C.FSDSP (RV32/64) */
> + xinsn = OPC_RISC_FSD;
> + xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
> + xinsn = SET_RS1(xinsn, 2);
> + xinsn = SET_S_IMM(xinsn, GET_C_SDSP_IMM(insn));
> + xinsn_has_addr_offset = true;
> + }
> + break;
> + case OPC_RISC_C_FUNC_SWSP: /* C.SWSP */
> + xinsn = OPC_RISC_SW;
> + xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
> + xinsn = SET_RS1(xinsn, 2);
> + xinsn = SET_S_IMM(xinsn, GET_C_SWSP_IMM(insn));
> + xinsn_has_addr_offset = true;
> + break;
> + case 7:
> + if (riscv_cpu_xlen(env) == 32) { /* C.FSWSP (RV32) */
> + xinsn = OPC_RISC_FSW;
> + xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
> + xinsn = SET_RS1(xinsn, 2);
> + xinsn = SET_S_IMM(xinsn, GET_C_SWSP_IMM(insn));
> + xinsn_has_addr_offset = true;
> + } else { /* C.SDSP (RV64/RV128) */
> + xinsn = OPC_RISC_SD;
> + xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
> + xinsn = SET_RS1(xinsn, 2);
> + xinsn = SET_S_IMM(xinsn, GET_C_SDSP_IMM(insn));
> + xinsn_has_addr_offset = true;
> + }
> + break;
> + default:
> + break;
> + }
> + break;
> + default:
> + break;
> + }
> +
> + /*
> + * Clear Bit1 of transformed instruction to indicate that
> + * original insruction was a 16bit instruction
> + */
> + xinsn &= ~((target_ulong)0x2);
> + } else {
> + /* No need to transform 32bit (or wider) instructions */
> + xinsn = insn;
> +
> + /* Check for instructions which need address offset */
> + switch (MASK_OP_MAJOR(insn)) {
> + case OPC_RISC_LOAD:
> + case OPC_RISC_STORE:
> + case OPC_RISC_ATOMIC:
> + case OPC_RISC_FP_LOAD:
> + case OPC_RISC_FP_STORE:
> + xinsn_has_addr_offset = true;
> + break;
> + case OPC_RISC_SYSTEM:
> + if (MASK_OP_SYSTEM(insn) == OPC_RISC_HLVHSV) {
> + xinsn_has_addr_offset = true;
> + }
> + break;
> + }
> + }
> +
> + if (xinsn_has_addr_offset) {
> + /*
> + * The "Addr. Offset" field in transformed instruction is non-zero
> + * only for misaligned load/store traps which are very unlikely on
> + * QEMU so for now always set "Addr. Offset" to zero.
> + */
> + xinsn = SET_RS1(xinsn, 0);
> + }
> +
> + return xinsn;
> +}
> #endif /* !CONFIG_USER_ONLY */
>
> /*
> @@ -1340,6 +1535,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> target_ulong cause = cs->exception_index & RISCV_EXCP_INT_MASK;
> uint64_t deleg = async ? env->mideleg : env->medeleg;
> target_ulong tval = 0;
> + target_ulong tinst = 0;
> target_ulong htval = 0;
> target_ulong mtval2 = 0;
>
> @@ -1355,18 +1551,22 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> if (!async) {
> /* set tval to badaddr for traps with address information */
> switch (cause) {
> - case RISCV_EXCP_INST_GUEST_PAGE_FAULT:
> case RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT:
> case RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT:
> - case RISCV_EXCP_INST_ADDR_MIS:
> - case RISCV_EXCP_INST_ACCESS_FAULT:
> case RISCV_EXCP_LOAD_ADDR_MIS:
> case RISCV_EXCP_STORE_AMO_ADDR_MIS:
> case RISCV_EXCP_LOAD_ACCESS_FAULT:
> case RISCV_EXCP_STORE_AMO_ACCESS_FAULT:
> - case RISCV_EXCP_INST_PAGE_FAULT:
> case RISCV_EXCP_LOAD_PAGE_FAULT:
> case RISCV_EXCP_STORE_PAGE_FAULT:
> + write_gva = env->two_stage_lookup;
> + tval = env->badaddr;
> + tinst = riscv_transformed_insn(env, env->bins);
> + break;
> + case RISCV_EXCP_INST_GUEST_PAGE_FAULT:
> + case RISCV_EXCP_INST_ADDR_MIS:
> + case RISCV_EXCP_INST_ACCESS_FAULT:
> + case RISCV_EXCP_INST_PAGE_FAULT:
> write_gva = env->two_stage_lookup;
> tval = env->badaddr;
> break;
> @@ -1448,6 +1648,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> env->sepc = env->pc;
> env->stval = tval;
> env->htval = htval;
> + env->htinst = tinst;
> env->pc = (env->stvec >> 2 << 2) +
> ((async && (env->stvec & 3) == 1) ? cause * 4 : 0);
> riscv_cpu_set_mode(env, PRV_S);
> @@ -1478,6 +1679,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> env->mepc = env->pc;
> env->mtval = tval;
> env->mtval2 = mtval2;
> + env->mtinst = tinst;
> env->pc = (env->mtvec >> 2 << 2) +
> ((async && (env->mtvec & 3) == 1) ? cause * 4 : 0);
> riscv_cpu_set_mode(env, PRV_M);
> diff --git a/target/riscv/instmap.h b/target/riscv/instmap.h
> index 40b6d2b64d..f564a69d90 100644
> --- a/target/riscv/instmap.h
> +++ b/target/riscv/instmap.h
> @@ -184,6 +184,8 @@ enum {
> OPC_RISC_CSRRWI = OPC_RISC_SYSTEM | (0x5 << 12),
> OPC_RISC_CSRRSI = OPC_RISC_SYSTEM | (0x6 << 12),
> OPC_RISC_CSRRCI = OPC_RISC_SYSTEM | (0x7 << 12),
> +
> + OPC_RISC_HLVHSV = OPC_RISC_SYSTEM | (0x4 << 12),
> };
>
> #define MASK_OP_FP_LOAD(op) (MASK_OP_MAJOR(op) | (op & (0x7 << 12)))
> @@ -316,6 +318,12 @@ enum {
> #define GET_RS2(inst) extract32(inst, 20, 5)
> #define GET_RD(inst) extract32(inst, 7, 5)
> #define GET_IMM(inst) sextract64(inst, 20, 12)
> +#define SET_RS1(inst, val) deposit32(inst, 15, 5, val)
> +#define SET_RS2(inst, val) deposit32(inst, 20, 5, val)
> +#define SET_RD(inst, val) deposit32(inst, 7, 5, val)
> +#define SET_I_IMM(inst, val) deposit32(inst, 20, 12, val)
> +#define SET_S_IMM(inst, val) \
> + deposit32(deposit32(inst, 7, 5, val), 25, 7, (val) >> 5)
>
> /* RVC decoding macros */
> #define GET_C_IMM(inst) (extract32(inst, 2, 5) \
> @@ -346,6 +354,8 @@ enum {
> | (extract32(inst, 5, 1) << 6))
> #define GET_C_LD_IMM(inst) ((extract16(inst, 10, 3) << 3) \
> | (extract16(inst, 5, 2) << 6))
> +#define GET_C_SW_IMM(inst) GET_C_LW_IMM(inst)
> +#define GET_C_SD_IMM(inst) GET_C_LD_IMM(inst)
> #define GET_C_J_IMM(inst) ((extract32(inst, 3, 3) << 1) \
> | (extract32(inst, 11, 1) << 4) \
> | (extract32(inst, 2, 1) << 5) \
> @@ -366,4 +376,37 @@ enum {
> #define GET_C_RS1S(inst) (8 + extract16(inst, 7, 3))
> #define GET_C_RS2S(inst) (8 + extract16(inst, 2, 3))
>
> +#define GET_C_FUNC(inst) extract32(inst, 13, 3)
> +#define GET_C_OP(inst) extract32(inst, 0, 2)
> +
> +enum {
> + /* RVC Quadrants */
> + OPC_RISC_C_OP_QUAD0 = 0x0,
> + OPC_RISC_C_OP_QUAD1 = 0x1,
> + OPC_RISC_C_OP_QUAD2 = 0x2
> +};
> +
> +enum {
> + /* RVC Quadrant 0 */
> + OPC_RISC_C_FUNC_ADDI4SPN = 0x0,
> + OPC_RISC_C_FUNC_FLD_LQ = 0x1,
> + OPC_RISC_C_FUNC_LW = 0x2,
> + OPC_RISC_C_FUNC_FLW_LD = 0x3,
> + OPC_RISC_C_FUNC_FSD_SQ = 0x5,
> + OPC_RISC_C_FUNC_SW = 0x6,
> + OPC_RISC_C_FUNC_FSW_SD = 0x7
> +};
> +
> +enum {
> + /* RVC Quadrant 2 */
> + OPC_RISC_C_FUNC_SLLI_SLLI64 = 0x0,
> + OPC_RISC_C_FUNC_FLDSP_LQSP = 0x1,
> + OPC_RISC_C_FUNC_LWSP = 0x2,
> + OPC_RISC_C_FUNC_FLWSP_LDSP = 0x3,
> + OPC_RISC_C_FUNC_JR_MV_EBREAK_JALR_ADD = 0x4,
> + OPC_RISC_C_FUNC_FSDSP_SQSP = 0x5,
> + OPC_RISC_C_FUNC_SWSP = 0x6,
> + OPC_RISC_C_FUNC_FSWSP_SDSP = 0x7
> +};
> +
> #endif
> --
> 2.34.1
>
>
On Mon, Jun 6, 2022 at 11:48 AM Alistair Francis <alistair23@gmail.com> wrote:
>
> On Thu, May 26, 2022 at 8:12 PM Anup Patel <apatel@ventanamicro.com> wrote:
> >
> > We should write transformed instruction encoding of the trapped
> > instruction in [m|h]tinst CSR at time of taking trap as defined
> > by the RISC-V privileged specification v1.12.
> >
> > Signed-off-by: Anup Patel <apatel@ventanamicro.com>
>
> Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Whoops, I thought there was another patch. This doesn't seem to
implemented the guest-page fault pseudoinstructions which can be
generated while doing VS-stage translation
Alistair
>
> Alistair
>
> > ---
> > target/riscv/cpu_helper.c | 210 +++++++++++++++++++++++++++++++++++++-
> > target/riscv/instmap.h | 43 ++++++++
> > 2 files changed, 249 insertions(+), 4 deletions(-)
> >
> > diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
> > index d99fac9d2d..2a2b6776fb 100644
> > --- a/target/riscv/cpu_helper.c
> > +++ b/target/riscv/cpu_helper.c
> > @@ -22,6 +22,7 @@
> > #include "qemu/main-loop.h"
> > #include "cpu.h"
> > #include "exec/exec-all.h"
> > +#include "instmap.h"
> > #include "tcg/tcg-op.h"
> > #include "trace.h"
> > #include "semihosting/common-semi.h"
> > @@ -1316,6 +1317,200 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
> >
> > return true;
> > }
> > +
> > +static target_ulong riscv_transformed_insn(CPURISCVState *env,
> > + target_ulong insn)
> > +{
> > + bool xinsn_has_addr_offset = false;
> > + target_ulong xinsn = 0;
> > +
> > + /*
> > + * Only Quadrant 0 and Quadrant 2 of RVC instruction space need to
> > + * be uncompressed. The Quadrant 1 of RVC instruction space need
> > + * not be transformed because these instructions won't generate
> > + * any load/store trap.
> > + */
> > +
> > + if ((insn & 0x3) != 0x3) {
> > + /* Transform 16bit instruction into 32bit instruction */
> > + switch (GET_C_OP(insn)) {
> > + case OPC_RISC_C_OP_QUAD0: /* Quadrant 0 */
> > + switch (GET_C_FUNC(insn)) {
> > + case OPC_RISC_C_FUNC_FLD_LQ:
> > + if (riscv_cpu_xlen(env) != 128) { /* C.FLD (RV32/64) */
> > + xinsn = OPC_RISC_FLD;
> > + xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
> > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > + xinsn = SET_I_IMM(xinsn, GET_C_LD_IMM(insn));
> > + xinsn_has_addr_offset = true;
> > + }
> > + break;
> > + case OPC_RISC_C_FUNC_LW: /* C.LW */
> > + xinsn = OPC_RISC_LW;
> > + xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
> > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > + xinsn = SET_I_IMM(xinsn, GET_C_LW_IMM(insn));
> > + xinsn_has_addr_offset = true;
> > + break;
> > + case OPC_RISC_C_FUNC_FLW_LD:
> > + if (riscv_cpu_xlen(env) == 32) { /* C.FLW (RV32) */
> > + xinsn = OPC_RISC_FLW;
> > + xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
> > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > + xinsn = SET_I_IMM(xinsn, GET_C_LW_IMM(insn));
> > + xinsn_has_addr_offset = true;
> > + } else { /* C.LD (RV64/RV128) */
> > + xinsn = OPC_RISC_LD;
> > + xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
> > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > + xinsn = SET_I_IMM(xinsn, GET_C_LD_IMM(insn));
> > + xinsn_has_addr_offset = true;
> > + }
> > + break;
> > + case OPC_RISC_C_FUNC_FSD_SQ:
> > + if (riscv_cpu_xlen(env) != 128) { /* C.FSD (RV32/64) */
> > + xinsn = OPC_RISC_FSD;
> > + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
> > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > + xinsn = SET_S_IMM(xinsn, GET_C_SD_IMM(insn));
> > + xinsn_has_addr_offset = true;
> > + }
> > + break;
> > + case OPC_RISC_C_FUNC_SW: /* C.SW */
> > + xinsn = OPC_RISC_SW;
> > + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
> > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > + xinsn = SET_S_IMM(xinsn, GET_C_SW_IMM(insn));
> > + xinsn_has_addr_offset = true;
> > + break;
> > + case OPC_RISC_C_FUNC_FSW_SD:
> > + if (riscv_cpu_xlen(env) == 32) { /* C.FSW (RV32) */
> > + xinsn = OPC_RISC_FSW;
> > + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
> > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > + xinsn = SET_S_IMM(xinsn, GET_C_SW_IMM(insn));
> > + xinsn_has_addr_offset = true;
> > + } else { /* C.SD (RV64/RV128) */
> > + xinsn = OPC_RISC_SD;
> > + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
> > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > + xinsn = SET_S_IMM(xinsn, GET_C_SD_IMM(insn));
> > + xinsn_has_addr_offset = true;
> > + }
> > + break;
> > + default:
> > + break;
> > + }
> > + break;
> > + case OPC_RISC_C_OP_QUAD2: /* Quadrant 2 */
> > + switch (GET_C_FUNC(insn)) {
> > + case OPC_RISC_C_FUNC_FLDSP_LQSP:
> > + if (riscv_cpu_xlen(env) != 128) { /* C.FLDSP (RV32/64) */
> > + xinsn = OPC_RISC_FLD;
> > + xinsn = SET_RD(xinsn, GET_C_RD(insn));
> > + xinsn = SET_RS1(xinsn, 2);
> > + xinsn = SET_I_IMM(xinsn, GET_C_LDSP_IMM(insn));
> > + xinsn_has_addr_offset = true;
> > + }
> > + break;
> > + case OPC_RISC_C_FUNC_LWSP: /* C.LWSP */
> > + xinsn = OPC_RISC_LW;
> > + xinsn = SET_RD(xinsn, GET_C_RD(insn));
> > + xinsn = SET_RS1(xinsn, 2);
> > + xinsn = SET_I_IMM(xinsn, GET_C_LWSP_IMM(insn));
> > + xinsn_has_addr_offset = true;
> > + break;
> > + case OPC_RISC_C_FUNC_FLWSP_LDSP:
> > + if (riscv_cpu_xlen(env) == 32) { /* C.FLWSP (RV32) */
> > + xinsn = OPC_RISC_FLW;
> > + xinsn = SET_RD(xinsn, GET_C_RD(insn));
> > + xinsn = SET_RS1(xinsn, 2);
> > + xinsn = SET_I_IMM(xinsn, GET_C_LWSP_IMM(insn));
> > + xinsn_has_addr_offset = true;
> > + } else { /* C.LDSP (RV64/RV128) */
> > + xinsn = OPC_RISC_LD;
> > + xinsn = SET_RD(xinsn, GET_C_RD(insn));
> > + xinsn = SET_RS1(xinsn, 2);
> > + xinsn = SET_I_IMM(xinsn, GET_C_LDSP_IMM(insn));
> > + xinsn_has_addr_offset = true;
> > + }
> > + break;
> > + case OPC_RISC_C_FUNC_FSDSP_SQSP:
> > + if (riscv_cpu_xlen(env) != 128) { /* C.FSDSP (RV32/64) */
> > + xinsn = OPC_RISC_FSD;
> > + xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
> > + xinsn = SET_RS1(xinsn, 2);
> > + xinsn = SET_S_IMM(xinsn, GET_C_SDSP_IMM(insn));
> > + xinsn_has_addr_offset = true;
> > + }
> > + break;
> > + case OPC_RISC_C_FUNC_SWSP: /* C.SWSP */
> > + xinsn = OPC_RISC_SW;
> > + xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
> > + xinsn = SET_RS1(xinsn, 2);
> > + xinsn = SET_S_IMM(xinsn, GET_C_SWSP_IMM(insn));
> > + xinsn_has_addr_offset = true;
> > + break;
> > + case 7:
> > + if (riscv_cpu_xlen(env) == 32) { /* C.FSWSP (RV32) */
> > + xinsn = OPC_RISC_FSW;
> > + xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
> > + xinsn = SET_RS1(xinsn, 2);
> > + xinsn = SET_S_IMM(xinsn, GET_C_SWSP_IMM(insn));
> > + xinsn_has_addr_offset = true;
> > + } else { /* C.SDSP (RV64/RV128) */
> > + xinsn = OPC_RISC_SD;
> > + xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
> > + xinsn = SET_RS1(xinsn, 2);
> > + xinsn = SET_S_IMM(xinsn, GET_C_SDSP_IMM(insn));
> > + xinsn_has_addr_offset = true;
> > + }
> > + break;
> > + default:
> > + break;
> > + }
> > + break;
> > + default:
> > + break;
> > + }
> > +
> > + /*
> > + * Clear Bit1 of transformed instruction to indicate that
> > + * original insruction was a 16bit instruction
> > + */
> > + xinsn &= ~((target_ulong)0x2);
> > + } else {
> > + /* No need to transform 32bit (or wider) instructions */
> > + xinsn = insn;
> > +
> > + /* Check for instructions which need address offset */
> > + switch (MASK_OP_MAJOR(insn)) {
> > + case OPC_RISC_LOAD:
> > + case OPC_RISC_STORE:
> > + case OPC_RISC_ATOMIC:
> > + case OPC_RISC_FP_LOAD:
> > + case OPC_RISC_FP_STORE:
> > + xinsn_has_addr_offset = true;
> > + break;
> > + case OPC_RISC_SYSTEM:
> > + if (MASK_OP_SYSTEM(insn) == OPC_RISC_HLVHSV) {
> > + xinsn_has_addr_offset = true;
> > + }
> > + break;
> > + }
> > + }
> > +
> > + if (xinsn_has_addr_offset) {
> > + /*
> > + * The "Addr. Offset" field in transformed instruction is non-zero
> > + * only for misaligned load/store traps which are very unlikely on
> > + * QEMU so for now always set "Addr. Offset" to zero.
> > + */
> > + xinsn = SET_RS1(xinsn, 0);
> > + }
> > +
> > + return xinsn;
> > +}
> > #endif /* !CONFIG_USER_ONLY */
> >
> > /*
> > @@ -1340,6 +1535,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> > target_ulong cause = cs->exception_index & RISCV_EXCP_INT_MASK;
> > uint64_t deleg = async ? env->mideleg : env->medeleg;
> > target_ulong tval = 0;
> > + target_ulong tinst = 0;
> > target_ulong htval = 0;
> > target_ulong mtval2 = 0;
> >
> > @@ -1355,18 +1551,22 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> > if (!async) {
> > /* set tval to badaddr for traps with address information */
> > switch (cause) {
> > - case RISCV_EXCP_INST_GUEST_PAGE_FAULT:
> > case RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT:
> > case RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT:
> > - case RISCV_EXCP_INST_ADDR_MIS:
> > - case RISCV_EXCP_INST_ACCESS_FAULT:
> > case RISCV_EXCP_LOAD_ADDR_MIS:
> > case RISCV_EXCP_STORE_AMO_ADDR_MIS:
> > case RISCV_EXCP_LOAD_ACCESS_FAULT:
> > case RISCV_EXCP_STORE_AMO_ACCESS_FAULT:
> > - case RISCV_EXCP_INST_PAGE_FAULT:
> > case RISCV_EXCP_LOAD_PAGE_FAULT:
> > case RISCV_EXCP_STORE_PAGE_FAULT:
> > + write_gva = env->two_stage_lookup;
> > + tval = env->badaddr;
> > + tinst = riscv_transformed_insn(env, env->bins);
> > + break;
> > + case RISCV_EXCP_INST_GUEST_PAGE_FAULT:
> > + case RISCV_EXCP_INST_ADDR_MIS:
> > + case RISCV_EXCP_INST_ACCESS_FAULT:
> > + case RISCV_EXCP_INST_PAGE_FAULT:
> > write_gva = env->two_stage_lookup;
> > tval = env->badaddr;
> > break;
> > @@ -1448,6 +1648,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> > env->sepc = env->pc;
> > env->stval = tval;
> > env->htval = htval;
> > + env->htinst = tinst;
> > env->pc = (env->stvec >> 2 << 2) +
> > ((async && (env->stvec & 3) == 1) ? cause * 4 : 0);
> > riscv_cpu_set_mode(env, PRV_S);
> > @@ -1478,6 +1679,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> > env->mepc = env->pc;
> > env->mtval = tval;
> > env->mtval2 = mtval2;
> > + env->mtinst = tinst;
> > env->pc = (env->mtvec >> 2 << 2) +
> > ((async && (env->mtvec & 3) == 1) ? cause * 4 : 0);
> > riscv_cpu_set_mode(env, PRV_M);
> > diff --git a/target/riscv/instmap.h b/target/riscv/instmap.h
> > index 40b6d2b64d..f564a69d90 100644
> > --- a/target/riscv/instmap.h
> > +++ b/target/riscv/instmap.h
> > @@ -184,6 +184,8 @@ enum {
> > OPC_RISC_CSRRWI = OPC_RISC_SYSTEM | (0x5 << 12),
> > OPC_RISC_CSRRSI = OPC_RISC_SYSTEM | (0x6 << 12),
> > OPC_RISC_CSRRCI = OPC_RISC_SYSTEM | (0x7 << 12),
> > +
> > + OPC_RISC_HLVHSV = OPC_RISC_SYSTEM | (0x4 << 12),
> > };
> >
> > #define MASK_OP_FP_LOAD(op) (MASK_OP_MAJOR(op) | (op & (0x7 << 12)))
> > @@ -316,6 +318,12 @@ enum {
> > #define GET_RS2(inst) extract32(inst, 20, 5)
> > #define GET_RD(inst) extract32(inst, 7, 5)
> > #define GET_IMM(inst) sextract64(inst, 20, 12)
> > +#define SET_RS1(inst, val) deposit32(inst, 15, 5, val)
> > +#define SET_RS2(inst, val) deposit32(inst, 20, 5, val)
> > +#define SET_RD(inst, val) deposit32(inst, 7, 5, val)
> > +#define SET_I_IMM(inst, val) deposit32(inst, 20, 12, val)
> > +#define SET_S_IMM(inst, val) \
> > + deposit32(deposit32(inst, 7, 5, val), 25, 7, (val) >> 5)
> >
> > /* RVC decoding macros */
> > #define GET_C_IMM(inst) (extract32(inst, 2, 5) \
> > @@ -346,6 +354,8 @@ enum {
> > | (extract32(inst, 5, 1) << 6))
> > #define GET_C_LD_IMM(inst) ((extract16(inst, 10, 3) << 3) \
> > | (extract16(inst, 5, 2) << 6))
> > +#define GET_C_SW_IMM(inst) GET_C_LW_IMM(inst)
> > +#define GET_C_SD_IMM(inst) GET_C_LD_IMM(inst)
> > #define GET_C_J_IMM(inst) ((extract32(inst, 3, 3) << 1) \
> > | (extract32(inst, 11, 1) << 4) \
> > | (extract32(inst, 2, 1) << 5) \
> > @@ -366,4 +376,37 @@ enum {
> > #define GET_C_RS1S(inst) (8 + extract16(inst, 7, 3))
> > #define GET_C_RS2S(inst) (8 + extract16(inst, 2, 3))
> >
> > +#define GET_C_FUNC(inst) extract32(inst, 13, 3)
> > +#define GET_C_OP(inst) extract32(inst, 0, 2)
> > +
> > +enum {
> > + /* RVC Quadrants */
> > + OPC_RISC_C_OP_QUAD0 = 0x0,
> > + OPC_RISC_C_OP_QUAD1 = 0x1,
> > + OPC_RISC_C_OP_QUAD2 = 0x2
> > +};
> > +
> > +enum {
> > + /* RVC Quadrant 0 */
> > + OPC_RISC_C_FUNC_ADDI4SPN = 0x0,
> > + OPC_RISC_C_FUNC_FLD_LQ = 0x1,
> > + OPC_RISC_C_FUNC_LW = 0x2,
> > + OPC_RISC_C_FUNC_FLW_LD = 0x3,
> > + OPC_RISC_C_FUNC_FSD_SQ = 0x5,
> > + OPC_RISC_C_FUNC_SW = 0x6,
> > + OPC_RISC_C_FUNC_FSW_SD = 0x7
> > +};
> > +
> > +enum {
> > + /* RVC Quadrant 2 */
> > + OPC_RISC_C_FUNC_SLLI_SLLI64 = 0x0,
> > + OPC_RISC_C_FUNC_FLDSP_LQSP = 0x1,
> > + OPC_RISC_C_FUNC_LWSP = 0x2,
> > + OPC_RISC_C_FUNC_FLWSP_LDSP = 0x3,
> > + OPC_RISC_C_FUNC_JR_MV_EBREAK_JALR_ADD = 0x4,
> > + OPC_RISC_C_FUNC_FSDSP_SQSP = 0x5,
> > + OPC_RISC_C_FUNC_SWSP = 0x6,
> > + OPC_RISC_C_FUNC_FSWSP_SDSP = 0x7
> > +};
> > +
> > #endif
> > --
> > 2.34.1
> >
> >
On Mon, Jun 6, 2022 at 7:23 AM Alistair Francis <alistair23@gmail.com> wrote:
>
> On Mon, Jun 6, 2022 at 11:48 AM Alistair Francis <alistair23@gmail.com> wrote:
> >
> > On Thu, May 26, 2022 at 8:12 PM Anup Patel <apatel@ventanamicro.com> wrote:
> > >
> > > We should write transformed instruction encoding of the trapped
> > > instruction in [m|h]tinst CSR at time of taking trap as defined
> > > by the RISC-V privileged specification v1.12.
> > >
> > > Signed-off-by: Anup Patel <apatel@ventanamicro.com>
> >
> > Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
>
> Whoops, I thought there was another patch. This doesn't seem to
> implemented the guest-page fault pseudoinstructions which can be
> generated while doing VS-stage translation
I did not understand. Which guest-page fault pseudo-instructions ?
Regards,
Anup
>
> Alistair
>
> >
> > Alistair
> >
> > > ---
> > > target/riscv/cpu_helper.c | 210 +++++++++++++++++++++++++++++++++++++-
> > > target/riscv/instmap.h | 43 ++++++++
> > > 2 files changed, 249 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
> > > index d99fac9d2d..2a2b6776fb 100644
> > > --- a/target/riscv/cpu_helper.c
> > > +++ b/target/riscv/cpu_helper.c
> > > @@ -22,6 +22,7 @@
> > > #include "qemu/main-loop.h"
> > > #include "cpu.h"
> > > #include "exec/exec-all.h"
> > > +#include "instmap.h"
> > > #include "tcg/tcg-op.h"
> > > #include "trace.h"
> > > #include "semihosting/common-semi.h"
> > > @@ -1316,6 +1317,200 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
> > >
> > > return true;
> > > }
> > > +
> > > +static target_ulong riscv_transformed_insn(CPURISCVState *env,
> > > + target_ulong insn)
> > > +{
> > > + bool xinsn_has_addr_offset = false;
> > > + target_ulong xinsn = 0;
> > > +
> > > + /*
> > > + * Only Quadrant 0 and Quadrant 2 of RVC instruction space need to
> > > + * be uncompressed. The Quadrant 1 of RVC instruction space need
> > > + * not be transformed because these instructions won't generate
> > > + * any load/store trap.
> > > + */
> > > +
> > > + if ((insn & 0x3) != 0x3) {
> > > + /* Transform 16bit instruction into 32bit instruction */
> > > + switch (GET_C_OP(insn)) {
> > > + case OPC_RISC_C_OP_QUAD0: /* Quadrant 0 */
> > > + switch (GET_C_FUNC(insn)) {
> > > + case OPC_RISC_C_FUNC_FLD_LQ:
> > > + if (riscv_cpu_xlen(env) != 128) { /* C.FLD (RV32/64) */
> > > + xinsn = OPC_RISC_FLD;
> > > + xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
> > > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > > + xinsn = SET_I_IMM(xinsn, GET_C_LD_IMM(insn));
> > > + xinsn_has_addr_offset = true;
> > > + }
> > > + break;
> > > + case OPC_RISC_C_FUNC_LW: /* C.LW */
> > > + xinsn = OPC_RISC_LW;
> > > + xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
> > > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > > + xinsn = SET_I_IMM(xinsn, GET_C_LW_IMM(insn));
> > > + xinsn_has_addr_offset = true;
> > > + break;
> > > + case OPC_RISC_C_FUNC_FLW_LD:
> > > + if (riscv_cpu_xlen(env) == 32) { /* C.FLW (RV32) */
> > > + xinsn = OPC_RISC_FLW;
> > > + xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
> > > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > > + xinsn = SET_I_IMM(xinsn, GET_C_LW_IMM(insn));
> > > + xinsn_has_addr_offset = true;
> > > + } else { /* C.LD (RV64/RV128) */
> > > + xinsn = OPC_RISC_LD;
> > > + xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
> > > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > > + xinsn = SET_I_IMM(xinsn, GET_C_LD_IMM(insn));
> > > + xinsn_has_addr_offset = true;
> > > + }
> > > + break;
> > > + case OPC_RISC_C_FUNC_FSD_SQ:
> > > + if (riscv_cpu_xlen(env) != 128) { /* C.FSD (RV32/64) */
> > > + xinsn = OPC_RISC_FSD;
> > > + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
> > > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > > + xinsn = SET_S_IMM(xinsn, GET_C_SD_IMM(insn));
> > > + xinsn_has_addr_offset = true;
> > > + }
> > > + break;
> > > + case OPC_RISC_C_FUNC_SW: /* C.SW */
> > > + xinsn = OPC_RISC_SW;
> > > + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
> > > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > > + xinsn = SET_S_IMM(xinsn, GET_C_SW_IMM(insn));
> > > + xinsn_has_addr_offset = true;
> > > + break;
> > > + case OPC_RISC_C_FUNC_FSW_SD:
> > > + if (riscv_cpu_xlen(env) == 32) { /* C.FSW (RV32) */
> > > + xinsn = OPC_RISC_FSW;
> > > + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
> > > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > > + xinsn = SET_S_IMM(xinsn, GET_C_SW_IMM(insn));
> > > + xinsn_has_addr_offset = true;
> > > + } else { /* C.SD (RV64/RV128) */
> > > + xinsn = OPC_RISC_SD;
> > > + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
> > > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > > + xinsn = SET_S_IMM(xinsn, GET_C_SD_IMM(insn));
> > > + xinsn_has_addr_offset = true;
> > > + }
> > > + break;
> > > + default:
> > > + break;
> > > + }
> > > + break;
> > > + case OPC_RISC_C_OP_QUAD2: /* Quadrant 2 */
> > > + switch (GET_C_FUNC(insn)) {
> > > + case OPC_RISC_C_FUNC_FLDSP_LQSP:
> > > + if (riscv_cpu_xlen(env) != 128) { /* C.FLDSP (RV32/64) */
> > > + xinsn = OPC_RISC_FLD;
> > > + xinsn = SET_RD(xinsn, GET_C_RD(insn));
> > > + xinsn = SET_RS1(xinsn, 2);
> > > + xinsn = SET_I_IMM(xinsn, GET_C_LDSP_IMM(insn));
> > > + xinsn_has_addr_offset = true;
> > > + }
> > > + break;
> > > + case OPC_RISC_C_FUNC_LWSP: /* C.LWSP */
> > > + xinsn = OPC_RISC_LW;
> > > + xinsn = SET_RD(xinsn, GET_C_RD(insn));
> > > + xinsn = SET_RS1(xinsn, 2);
> > > + xinsn = SET_I_IMM(xinsn, GET_C_LWSP_IMM(insn));
> > > + xinsn_has_addr_offset = true;
> > > + break;
> > > + case OPC_RISC_C_FUNC_FLWSP_LDSP:
> > > + if (riscv_cpu_xlen(env) == 32) { /* C.FLWSP (RV32) */
> > > + xinsn = OPC_RISC_FLW;
> > > + xinsn = SET_RD(xinsn, GET_C_RD(insn));
> > > + xinsn = SET_RS1(xinsn, 2);
> > > + xinsn = SET_I_IMM(xinsn, GET_C_LWSP_IMM(insn));
> > > + xinsn_has_addr_offset = true;
> > > + } else { /* C.LDSP (RV64/RV128) */
> > > + xinsn = OPC_RISC_LD;
> > > + xinsn = SET_RD(xinsn, GET_C_RD(insn));
> > > + xinsn = SET_RS1(xinsn, 2);
> > > + xinsn = SET_I_IMM(xinsn, GET_C_LDSP_IMM(insn));
> > > + xinsn_has_addr_offset = true;
> > > + }
> > > + break;
> > > + case OPC_RISC_C_FUNC_FSDSP_SQSP:
> > > + if (riscv_cpu_xlen(env) != 128) { /* C.FSDSP (RV32/64) */
> > > + xinsn = OPC_RISC_FSD;
> > > + xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
> > > + xinsn = SET_RS1(xinsn, 2);
> > > + xinsn = SET_S_IMM(xinsn, GET_C_SDSP_IMM(insn));
> > > + xinsn_has_addr_offset = true;
> > > + }
> > > + break;
> > > + case OPC_RISC_C_FUNC_SWSP: /* C.SWSP */
> > > + xinsn = OPC_RISC_SW;
> > > + xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
> > > + xinsn = SET_RS1(xinsn, 2);
> > > + xinsn = SET_S_IMM(xinsn, GET_C_SWSP_IMM(insn));
> > > + xinsn_has_addr_offset = true;
> > > + break;
> > > + case 7:
> > > + if (riscv_cpu_xlen(env) == 32) { /* C.FSWSP (RV32) */
> > > + xinsn = OPC_RISC_FSW;
> > > + xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
> > > + xinsn = SET_RS1(xinsn, 2);
> > > + xinsn = SET_S_IMM(xinsn, GET_C_SWSP_IMM(insn));
> > > + xinsn_has_addr_offset = true;
> > > + } else { /* C.SDSP (RV64/RV128) */
> > > + xinsn = OPC_RISC_SD;
> > > + xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
> > > + xinsn = SET_RS1(xinsn, 2);
> > > + xinsn = SET_S_IMM(xinsn, GET_C_SDSP_IMM(insn));
> > > + xinsn_has_addr_offset = true;
> > > + }
> > > + break;
> > > + default:
> > > + break;
> > > + }
> > > + break;
> > > + default:
> > > + break;
> > > + }
> > > +
> > > + /*
> > > + * Clear Bit1 of transformed instruction to indicate that
> > > + * original insruction was a 16bit instruction
> > > + */
> > > + xinsn &= ~((target_ulong)0x2);
> > > + } else {
> > > + /* No need to transform 32bit (or wider) instructions */
> > > + xinsn = insn;
> > > +
> > > + /* Check for instructions which need address offset */
> > > + switch (MASK_OP_MAJOR(insn)) {
> > > + case OPC_RISC_LOAD:
> > > + case OPC_RISC_STORE:
> > > + case OPC_RISC_ATOMIC:
> > > + case OPC_RISC_FP_LOAD:
> > > + case OPC_RISC_FP_STORE:
> > > + xinsn_has_addr_offset = true;
> > > + break;
> > > + case OPC_RISC_SYSTEM:
> > > + if (MASK_OP_SYSTEM(insn) == OPC_RISC_HLVHSV) {
> > > + xinsn_has_addr_offset = true;
> > > + }
> > > + break;
> > > + }
> > > + }
> > > +
> > > + if (xinsn_has_addr_offset) {
> > > + /*
> > > + * The "Addr. Offset" field in transformed instruction is non-zero
> > > + * only for misaligned load/store traps which are very unlikely on
> > > + * QEMU so for now always set "Addr. Offset" to zero.
> > > + */
> > > + xinsn = SET_RS1(xinsn, 0);
> > > + }
> > > +
> > > + return xinsn;
> > > +}
> > > #endif /* !CONFIG_USER_ONLY */
> > >
> > > /*
> > > @@ -1340,6 +1535,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> > > target_ulong cause = cs->exception_index & RISCV_EXCP_INT_MASK;
> > > uint64_t deleg = async ? env->mideleg : env->medeleg;
> > > target_ulong tval = 0;
> > > + target_ulong tinst = 0;
> > > target_ulong htval = 0;
> > > target_ulong mtval2 = 0;
> > >
> > > @@ -1355,18 +1551,22 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> > > if (!async) {
> > > /* set tval to badaddr for traps with address information */
> > > switch (cause) {
> > > - case RISCV_EXCP_INST_GUEST_PAGE_FAULT:
> > > case RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT:
> > > case RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT:
> > > - case RISCV_EXCP_INST_ADDR_MIS:
> > > - case RISCV_EXCP_INST_ACCESS_FAULT:
> > > case RISCV_EXCP_LOAD_ADDR_MIS:
> > > case RISCV_EXCP_STORE_AMO_ADDR_MIS:
> > > case RISCV_EXCP_LOAD_ACCESS_FAULT:
> > > case RISCV_EXCP_STORE_AMO_ACCESS_FAULT:
> > > - case RISCV_EXCP_INST_PAGE_FAULT:
> > > case RISCV_EXCP_LOAD_PAGE_FAULT:
> > > case RISCV_EXCP_STORE_PAGE_FAULT:
> > > + write_gva = env->two_stage_lookup;
> > > + tval = env->badaddr;
> > > + tinst = riscv_transformed_insn(env, env->bins);
> > > + break;
> > > + case RISCV_EXCP_INST_GUEST_PAGE_FAULT:
> > > + case RISCV_EXCP_INST_ADDR_MIS:
> > > + case RISCV_EXCP_INST_ACCESS_FAULT:
> > > + case RISCV_EXCP_INST_PAGE_FAULT:
> > > write_gva = env->two_stage_lookup;
> > > tval = env->badaddr;
> > > break;
> > > @@ -1448,6 +1648,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> > > env->sepc = env->pc;
> > > env->stval = tval;
> > > env->htval = htval;
> > > + env->htinst = tinst;
> > > env->pc = (env->stvec >> 2 << 2) +
> > > ((async && (env->stvec & 3) == 1) ? cause * 4 : 0);
> > > riscv_cpu_set_mode(env, PRV_S);
> > > @@ -1478,6 +1679,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> > > env->mepc = env->pc;
> > > env->mtval = tval;
> > > env->mtval2 = mtval2;
> > > + env->mtinst = tinst;
> > > env->pc = (env->mtvec >> 2 << 2) +
> > > ((async && (env->mtvec & 3) == 1) ? cause * 4 : 0);
> > > riscv_cpu_set_mode(env, PRV_M);
> > > diff --git a/target/riscv/instmap.h b/target/riscv/instmap.h
> > > index 40b6d2b64d..f564a69d90 100644
> > > --- a/target/riscv/instmap.h
> > > +++ b/target/riscv/instmap.h
> > > @@ -184,6 +184,8 @@ enum {
> > > OPC_RISC_CSRRWI = OPC_RISC_SYSTEM | (0x5 << 12),
> > > OPC_RISC_CSRRSI = OPC_RISC_SYSTEM | (0x6 << 12),
> > > OPC_RISC_CSRRCI = OPC_RISC_SYSTEM | (0x7 << 12),
> > > +
> > > + OPC_RISC_HLVHSV = OPC_RISC_SYSTEM | (0x4 << 12),
> > > };
> > >
> > > #define MASK_OP_FP_LOAD(op) (MASK_OP_MAJOR(op) | (op & (0x7 << 12)))
> > > @@ -316,6 +318,12 @@ enum {
> > > #define GET_RS2(inst) extract32(inst, 20, 5)
> > > #define GET_RD(inst) extract32(inst, 7, 5)
> > > #define GET_IMM(inst) sextract64(inst, 20, 12)
> > > +#define SET_RS1(inst, val) deposit32(inst, 15, 5, val)
> > > +#define SET_RS2(inst, val) deposit32(inst, 20, 5, val)
> > > +#define SET_RD(inst, val) deposit32(inst, 7, 5, val)
> > > +#define SET_I_IMM(inst, val) deposit32(inst, 20, 12, val)
> > > +#define SET_S_IMM(inst, val) \
> > > + deposit32(deposit32(inst, 7, 5, val), 25, 7, (val) >> 5)
> > >
> > > /* RVC decoding macros */
> > > #define GET_C_IMM(inst) (extract32(inst, 2, 5) \
> > > @@ -346,6 +354,8 @@ enum {
> > > | (extract32(inst, 5, 1) << 6))
> > > #define GET_C_LD_IMM(inst) ((extract16(inst, 10, 3) << 3) \
> > > | (extract16(inst, 5, 2) << 6))
> > > +#define GET_C_SW_IMM(inst) GET_C_LW_IMM(inst)
> > > +#define GET_C_SD_IMM(inst) GET_C_LD_IMM(inst)
> > > #define GET_C_J_IMM(inst) ((extract32(inst, 3, 3) << 1) \
> > > | (extract32(inst, 11, 1) << 4) \
> > > | (extract32(inst, 2, 1) << 5) \
> > > @@ -366,4 +376,37 @@ enum {
> > > #define GET_C_RS1S(inst) (8 + extract16(inst, 7, 3))
> > > #define GET_C_RS2S(inst) (8 + extract16(inst, 2, 3))
> > >
> > > +#define GET_C_FUNC(inst) extract32(inst, 13, 3)
> > > +#define GET_C_OP(inst) extract32(inst, 0, 2)
> > > +
> > > +enum {
> > > + /* RVC Quadrants */
> > > + OPC_RISC_C_OP_QUAD0 = 0x0,
> > > + OPC_RISC_C_OP_QUAD1 = 0x1,
> > > + OPC_RISC_C_OP_QUAD2 = 0x2
> > > +};
> > > +
> > > +enum {
> > > + /* RVC Quadrant 0 */
> > > + OPC_RISC_C_FUNC_ADDI4SPN = 0x0,
> > > + OPC_RISC_C_FUNC_FLD_LQ = 0x1,
> > > + OPC_RISC_C_FUNC_LW = 0x2,
> > > + OPC_RISC_C_FUNC_FLW_LD = 0x3,
> > > + OPC_RISC_C_FUNC_FSD_SQ = 0x5,
> > > + OPC_RISC_C_FUNC_SW = 0x6,
> > > + OPC_RISC_C_FUNC_FSW_SD = 0x7
> > > +};
> > > +
> > > +enum {
> > > + /* RVC Quadrant 2 */
> > > + OPC_RISC_C_FUNC_SLLI_SLLI64 = 0x0,
> > > + OPC_RISC_C_FUNC_FLDSP_LQSP = 0x1,
> > > + OPC_RISC_C_FUNC_LWSP = 0x2,
> > > + OPC_RISC_C_FUNC_FLWSP_LDSP = 0x3,
> > > + OPC_RISC_C_FUNC_JR_MV_EBREAK_JALR_ADD = 0x4,
> > > + OPC_RISC_C_FUNC_FSDSP_SQSP = 0x5,
> > > + OPC_RISC_C_FUNC_SWSP = 0x6,
> > > + OPC_RISC_C_FUNC_FSWSP_SDSP = 0x7
> > > +};
> > > +
> > > #endif
> > > --
> > > 2.34.1
> > >
> > >
On Tue, Jun 7, 2022 at 8:31 AM Anup Patel <anup@brainfault.org> wrote:
>
> On Mon, Jun 6, 2022 at 7:23 AM Alistair Francis <alistair23@gmail.com> wrote:
> >
> > On Mon, Jun 6, 2022 at 11:48 AM Alistair Francis <alistair23@gmail.com> wrote:
> > >
> > > On Thu, May 26, 2022 at 8:12 PM Anup Patel <apatel@ventanamicro.com> wrote:
> > > >
> > > > We should write transformed instruction encoding of the trapped
> > > > instruction in [m|h]tinst CSR at time of taking trap as defined
> > > > by the RISC-V privileged specification v1.12.
> > > >
> > > > Signed-off-by: Anup Patel <apatel@ventanamicro.com>
> > >
> > > Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
> >
> > Whoops, I thought there was another patch. This doesn't seem to
> > implemented the guest-page fault pseudoinstructions which can be
> > generated while doing VS-stage translation
>
> I did not understand. Which guest-page fault pseudo-instructions ?
Nevermind, I see what you meant. Let me check.
Regards,
Anup
>
> Regards,
> Anup
>
> >
> > Alistair
> >
> > >
> > > Alistair
> > >
> > > > ---
> > > > target/riscv/cpu_helper.c | 210 +++++++++++++++++++++++++++++++++++++-
> > > > target/riscv/instmap.h | 43 ++++++++
> > > > 2 files changed, 249 insertions(+), 4 deletions(-)
> > > >
> > > > diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
> > > > index d99fac9d2d..2a2b6776fb 100644
> > > > --- a/target/riscv/cpu_helper.c
> > > > +++ b/target/riscv/cpu_helper.c
> > > > @@ -22,6 +22,7 @@
> > > > #include "qemu/main-loop.h"
> > > > #include "cpu.h"
> > > > #include "exec/exec-all.h"
> > > > +#include "instmap.h"
> > > > #include "tcg/tcg-op.h"
> > > > #include "trace.h"
> > > > #include "semihosting/common-semi.h"
> > > > @@ -1316,6 +1317,200 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
> > > >
> > > > return true;
> > > > }
> > > > +
> > > > +static target_ulong riscv_transformed_insn(CPURISCVState *env,
> > > > + target_ulong insn)
> > > > +{
> > > > + bool xinsn_has_addr_offset = false;
> > > > + target_ulong xinsn = 0;
> > > > +
> > > > + /*
> > > > + * Only Quadrant 0 and Quadrant 2 of RVC instruction space need to
> > > > + * be uncompressed. The Quadrant 1 of RVC instruction space need
> > > > + * not be transformed because these instructions won't generate
> > > > + * any load/store trap.
> > > > + */
> > > > +
> > > > + if ((insn & 0x3) != 0x3) {
> > > > + /* Transform 16bit instruction into 32bit instruction */
> > > > + switch (GET_C_OP(insn)) {
> > > > + case OPC_RISC_C_OP_QUAD0: /* Quadrant 0 */
> > > > + switch (GET_C_FUNC(insn)) {
> > > > + case OPC_RISC_C_FUNC_FLD_LQ:
> > > > + if (riscv_cpu_xlen(env) != 128) { /* C.FLD (RV32/64) */
> > > > + xinsn = OPC_RISC_FLD;
> > > > + xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
> > > > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > > > + xinsn = SET_I_IMM(xinsn, GET_C_LD_IMM(insn));
> > > > + xinsn_has_addr_offset = true;
> > > > + }
> > > > + break;
> > > > + case OPC_RISC_C_FUNC_LW: /* C.LW */
> > > > + xinsn = OPC_RISC_LW;
> > > > + xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
> > > > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > > > + xinsn = SET_I_IMM(xinsn, GET_C_LW_IMM(insn));
> > > > + xinsn_has_addr_offset = true;
> > > > + break;
> > > > + case OPC_RISC_C_FUNC_FLW_LD:
> > > > + if (riscv_cpu_xlen(env) == 32) { /* C.FLW (RV32) */
> > > > + xinsn = OPC_RISC_FLW;
> > > > + xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
> > > > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > > > + xinsn = SET_I_IMM(xinsn, GET_C_LW_IMM(insn));
> > > > + xinsn_has_addr_offset = true;
> > > > + } else { /* C.LD (RV64/RV128) */
> > > > + xinsn = OPC_RISC_LD;
> > > > + xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
> > > > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > > > + xinsn = SET_I_IMM(xinsn, GET_C_LD_IMM(insn));
> > > > + xinsn_has_addr_offset = true;
> > > > + }
> > > > + break;
> > > > + case OPC_RISC_C_FUNC_FSD_SQ:
> > > > + if (riscv_cpu_xlen(env) != 128) { /* C.FSD (RV32/64) */
> > > > + xinsn = OPC_RISC_FSD;
> > > > + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
> > > > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > > > + xinsn = SET_S_IMM(xinsn, GET_C_SD_IMM(insn));
> > > > + xinsn_has_addr_offset = true;
> > > > + }
> > > > + break;
> > > > + case OPC_RISC_C_FUNC_SW: /* C.SW */
> > > > + xinsn = OPC_RISC_SW;
> > > > + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
> > > > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > > > + xinsn = SET_S_IMM(xinsn, GET_C_SW_IMM(insn));
> > > > + xinsn_has_addr_offset = true;
> > > > + break;
> > > > + case OPC_RISC_C_FUNC_FSW_SD:
> > > > + if (riscv_cpu_xlen(env) == 32) { /* C.FSW (RV32) */
> > > > + xinsn = OPC_RISC_FSW;
> > > > + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
> > > > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > > > + xinsn = SET_S_IMM(xinsn, GET_C_SW_IMM(insn));
> > > > + xinsn_has_addr_offset = true;
> > > > + } else { /* C.SD (RV64/RV128) */
> > > > + xinsn = OPC_RISC_SD;
> > > > + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
> > > > + xinsn = SET_RS1(xinsn, GET_C_RS1S(insn));
> > > > + xinsn = SET_S_IMM(xinsn, GET_C_SD_IMM(insn));
> > > > + xinsn_has_addr_offset = true;
> > > > + }
> > > > + break;
> > > > + default:
> > > > + break;
> > > > + }
> > > > + break;
> > > > + case OPC_RISC_C_OP_QUAD2: /* Quadrant 2 */
> > > > + switch (GET_C_FUNC(insn)) {
> > > > + case OPC_RISC_C_FUNC_FLDSP_LQSP:
> > > > + if (riscv_cpu_xlen(env) != 128) { /* C.FLDSP (RV32/64) */
> > > > + xinsn = OPC_RISC_FLD;
> > > > + xinsn = SET_RD(xinsn, GET_C_RD(insn));
> > > > + xinsn = SET_RS1(xinsn, 2);
> > > > + xinsn = SET_I_IMM(xinsn, GET_C_LDSP_IMM(insn));
> > > > + xinsn_has_addr_offset = true;
> > > > + }
> > > > + break;
> > > > + case OPC_RISC_C_FUNC_LWSP: /* C.LWSP */
> > > > + xinsn = OPC_RISC_LW;
> > > > + xinsn = SET_RD(xinsn, GET_C_RD(insn));
> > > > + xinsn = SET_RS1(xinsn, 2);
> > > > + xinsn = SET_I_IMM(xinsn, GET_C_LWSP_IMM(insn));
> > > > + xinsn_has_addr_offset = true;
> > > > + break;
> > > > + case OPC_RISC_C_FUNC_FLWSP_LDSP:
> > > > + if (riscv_cpu_xlen(env) == 32) { /* C.FLWSP (RV32) */
> > > > + xinsn = OPC_RISC_FLW;
> > > > + xinsn = SET_RD(xinsn, GET_C_RD(insn));
> > > > + xinsn = SET_RS1(xinsn, 2);
> > > > + xinsn = SET_I_IMM(xinsn, GET_C_LWSP_IMM(insn));
> > > > + xinsn_has_addr_offset = true;
> > > > + } else { /* C.LDSP (RV64/RV128) */
> > > > + xinsn = OPC_RISC_LD;
> > > > + xinsn = SET_RD(xinsn, GET_C_RD(insn));
> > > > + xinsn = SET_RS1(xinsn, 2);
> > > > + xinsn = SET_I_IMM(xinsn, GET_C_LDSP_IMM(insn));
> > > > + xinsn_has_addr_offset = true;
> > > > + }
> > > > + break;
> > > > + case OPC_RISC_C_FUNC_FSDSP_SQSP:
> > > > + if (riscv_cpu_xlen(env) != 128) { /* C.FSDSP (RV32/64) */
> > > > + xinsn = OPC_RISC_FSD;
> > > > + xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
> > > > + xinsn = SET_RS1(xinsn, 2);
> > > > + xinsn = SET_S_IMM(xinsn, GET_C_SDSP_IMM(insn));
> > > > + xinsn_has_addr_offset = true;
> > > > + }
> > > > + break;
> > > > + case OPC_RISC_C_FUNC_SWSP: /* C.SWSP */
> > > > + xinsn = OPC_RISC_SW;
> > > > + xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
> > > > + xinsn = SET_RS1(xinsn, 2);
> > > > + xinsn = SET_S_IMM(xinsn, GET_C_SWSP_IMM(insn));
> > > > + xinsn_has_addr_offset = true;
> > > > + break;
> > > > + case 7:
> > > > + if (riscv_cpu_xlen(env) == 32) { /* C.FSWSP (RV32) */
> > > > + xinsn = OPC_RISC_FSW;
> > > > + xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
> > > > + xinsn = SET_RS1(xinsn, 2);
> > > > + xinsn = SET_S_IMM(xinsn, GET_C_SWSP_IMM(insn));
> > > > + xinsn_has_addr_offset = true;
> > > > + } else { /* C.SDSP (RV64/RV128) */
> > > > + xinsn = OPC_RISC_SD;
> > > > + xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
> > > > + xinsn = SET_RS1(xinsn, 2);
> > > > + xinsn = SET_S_IMM(xinsn, GET_C_SDSP_IMM(insn));
> > > > + xinsn_has_addr_offset = true;
> > > > + }
> > > > + break;
> > > > + default:
> > > > + break;
> > > > + }
> > > > + break;
> > > > + default:
> > > > + break;
> > > > + }
> > > > +
> > > > + /*
> > > > + * Clear Bit1 of transformed instruction to indicate that
> > > > + * original insruction was a 16bit instruction
> > > > + */
> > > > + xinsn &= ~((target_ulong)0x2);
> > > > + } else {
> > > > + /* No need to transform 32bit (or wider) instructions */
> > > > + xinsn = insn;
> > > > +
> > > > + /* Check for instructions which need address offset */
> > > > + switch (MASK_OP_MAJOR(insn)) {
> > > > + case OPC_RISC_LOAD:
> > > > + case OPC_RISC_STORE:
> > > > + case OPC_RISC_ATOMIC:
> > > > + case OPC_RISC_FP_LOAD:
> > > > + case OPC_RISC_FP_STORE:
> > > > + xinsn_has_addr_offset = true;
> > > > + break;
> > > > + case OPC_RISC_SYSTEM:
> > > > + if (MASK_OP_SYSTEM(insn) == OPC_RISC_HLVHSV) {
> > > > + xinsn_has_addr_offset = true;
> > > > + }
> > > > + break;
> > > > + }
> > > > + }
> > > > +
> > > > + if (xinsn_has_addr_offset) {
> > > > + /*
> > > > + * The "Addr. Offset" field in transformed instruction is non-zero
> > > > + * only for misaligned load/store traps which are very unlikely on
> > > > + * QEMU so for now always set "Addr. Offset" to zero.
> > > > + */
> > > > + xinsn = SET_RS1(xinsn, 0);
> > > > + }
> > > > +
> > > > + return xinsn;
> > > > +}
> > > > #endif /* !CONFIG_USER_ONLY */
> > > >
> > > > /*
> > > > @@ -1340,6 +1535,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> > > > target_ulong cause = cs->exception_index & RISCV_EXCP_INT_MASK;
> > > > uint64_t deleg = async ? env->mideleg : env->medeleg;
> > > > target_ulong tval = 0;
> > > > + target_ulong tinst = 0;
> > > > target_ulong htval = 0;
> > > > target_ulong mtval2 = 0;
> > > >
> > > > @@ -1355,18 +1551,22 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> > > > if (!async) {
> > > > /* set tval to badaddr for traps with address information */
> > > > switch (cause) {
> > > > - case RISCV_EXCP_INST_GUEST_PAGE_FAULT:
> > > > case RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT:
> > > > case RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT:
> > > > - case RISCV_EXCP_INST_ADDR_MIS:
> > > > - case RISCV_EXCP_INST_ACCESS_FAULT:
> > > > case RISCV_EXCP_LOAD_ADDR_MIS:
> > > > case RISCV_EXCP_STORE_AMO_ADDR_MIS:
> > > > case RISCV_EXCP_LOAD_ACCESS_FAULT:
> > > > case RISCV_EXCP_STORE_AMO_ACCESS_FAULT:
> > > > - case RISCV_EXCP_INST_PAGE_FAULT:
> > > > case RISCV_EXCP_LOAD_PAGE_FAULT:
> > > > case RISCV_EXCP_STORE_PAGE_FAULT:
> > > > + write_gva = env->two_stage_lookup;
> > > > + tval = env->badaddr;
> > > > + tinst = riscv_transformed_insn(env, env->bins);
> > > > + break;
> > > > + case RISCV_EXCP_INST_GUEST_PAGE_FAULT:
> > > > + case RISCV_EXCP_INST_ADDR_MIS:
> > > > + case RISCV_EXCP_INST_ACCESS_FAULT:
> > > > + case RISCV_EXCP_INST_PAGE_FAULT:
> > > > write_gva = env->two_stage_lookup;
> > > > tval = env->badaddr;
> > > > break;
> > > > @@ -1448,6 +1648,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> > > > env->sepc = env->pc;
> > > > env->stval = tval;
> > > > env->htval = htval;
> > > > + env->htinst = tinst;
> > > > env->pc = (env->stvec >> 2 << 2) +
> > > > ((async && (env->stvec & 3) == 1) ? cause * 4 : 0);
> > > > riscv_cpu_set_mode(env, PRV_S);
> > > > @@ -1478,6 +1679,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> > > > env->mepc = env->pc;
> > > > env->mtval = tval;
> > > > env->mtval2 = mtval2;
> > > > + env->mtinst = tinst;
> > > > env->pc = (env->mtvec >> 2 << 2) +
> > > > ((async && (env->mtvec & 3) == 1) ? cause * 4 : 0);
> > > > riscv_cpu_set_mode(env, PRV_M);
> > > > diff --git a/target/riscv/instmap.h b/target/riscv/instmap.h
> > > > index 40b6d2b64d..f564a69d90 100644
> > > > --- a/target/riscv/instmap.h
> > > > +++ b/target/riscv/instmap.h
> > > > @@ -184,6 +184,8 @@ enum {
> > > > OPC_RISC_CSRRWI = OPC_RISC_SYSTEM | (0x5 << 12),
> > > > OPC_RISC_CSRRSI = OPC_RISC_SYSTEM | (0x6 << 12),
> > > > OPC_RISC_CSRRCI = OPC_RISC_SYSTEM | (0x7 << 12),
> > > > +
> > > > + OPC_RISC_HLVHSV = OPC_RISC_SYSTEM | (0x4 << 12),
> > > > };
> > > >
> > > > #define MASK_OP_FP_LOAD(op) (MASK_OP_MAJOR(op) | (op & (0x7 << 12)))
> > > > @@ -316,6 +318,12 @@ enum {
> > > > #define GET_RS2(inst) extract32(inst, 20, 5)
> > > > #define GET_RD(inst) extract32(inst, 7, 5)
> > > > #define GET_IMM(inst) sextract64(inst, 20, 12)
> > > > +#define SET_RS1(inst, val) deposit32(inst, 15, 5, val)
> > > > +#define SET_RS2(inst, val) deposit32(inst, 20, 5, val)
> > > > +#define SET_RD(inst, val) deposit32(inst, 7, 5, val)
> > > > +#define SET_I_IMM(inst, val) deposit32(inst, 20, 12, val)
> > > > +#define SET_S_IMM(inst, val) \
> > > > + deposit32(deposit32(inst, 7, 5, val), 25, 7, (val) >> 5)
> > > >
> > > > /* RVC decoding macros */
> > > > #define GET_C_IMM(inst) (extract32(inst, 2, 5) \
> > > > @@ -346,6 +354,8 @@ enum {
> > > > | (extract32(inst, 5, 1) << 6))
> > > > #define GET_C_LD_IMM(inst) ((extract16(inst, 10, 3) << 3) \
> > > > | (extract16(inst, 5, 2) << 6))
> > > > +#define GET_C_SW_IMM(inst) GET_C_LW_IMM(inst)
> > > > +#define GET_C_SD_IMM(inst) GET_C_LD_IMM(inst)
> > > > #define GET_C_J_IMM(inst) ((extract32(inst, 3, 3) << 1) \
> > > > | (extract32(inst, 11, 1) << 4) \
> > > > | (extract32(inst, 2, 1) << 5) \
> > > > @@ -366,4 +376,37 @@ enum {
> > > > #define GET_C_RS1S(inst) (8 + extract16(inst, 7, 3))
> > > > #define GET_C_RS2S(inst) (8 + extract16(inst, 2, 3))
> > > >
> > > > +#define GET_C_FUNC(inst) extract32(inst, 13, 3)
> > > > +#define GET_C_OP(inst) extract32(inst, 0, 2)
> > > > +
> > > > +enum {
> > > > + /* RVC Quadrants */
> > > > + OPC_RISC_C_OP_QUAD0 = 0x0,
> > > > + OPC_RISC_C_OP_QUAD1 = 0x1,
> > > > + OPC_RISC_C_OP_QUAD2 = 0x2
> > > > +};
> > > > +
> > > > +enum {
> > > > + /* RVC Quadrant 0 */
> > > > + OPC_RISC_C_FUNC_ADDI4SPN = 0x0,
> > > > + OPC_RISC_C_FUNC_FLD_LQ = 0x1,
> > > > + OPC_RISC_C_FUNC_LW = 0x2,
> > > > + OPC_RISC_C_FUNC_FLW_LD = 0x3,
> > > > + OPC_RISC_C_FUNC_FSD_SQ = 0x5,
> > > > + OPC_RISC_C_FUNC_SW = 0x6,
> > > > + OPC_RISC_C_FUNC_FSW_SD = 0x7
> > > > +};
> > > > +
> > > > +enum {
> > > > + /* RVC Quadrant 2 */
> > > > + OPC_RISC_C_FUNC_SLLI_SLLI64 = 0x0,
> > > > + OPC_RISC_C_FUNC_FLDSP_LQSP = 0x1,
> > > > + OPC_RISC_C_FUNC_LWSP = 0x2,
> > > > + OPC_RISC_C_FUNC_FLWSP_LDSP = 0x3,
> > > > + OPC_RISC_C_FUNC_JR_MV_EBREAK_JALR_ADD = 0x4,
> > > > + OPC_RISC_C_FUNC_FSDSP_SQSP = 0x5,
> > > > + OPC_RISC_C_FUNC_SWSP = 0x6,
> > > > + OPC_RISC_C_FUNC_FSWSP_SDSP = 0x7
> > > > +};
> > > > +
> > > > #endif
> > > > --
> > > > 2.34.1
> > > >
> > > >
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