This commit implements the stubs to handle the qIsAddressTagged,
qMemTag, and QMemTag GDB packets, allowing all GDB 'memory-tag'
subcommands to work with QEMU gdbstub on aarch64 user mode. It also
implements the get/set functions for the special GDB MTE register
'tag_ctl', used to control the MTE fault type at runtime.
Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org>
---
configs/targets/aarch64-linux-user.mak | 2 +-
gdb-xml/aarch64-mte.xml | 11 ++
target/arm/cpu.c | 1 +
target/arm/gdbstub.c | 46 +++++
target/arm/gdbstub64.c | 223 +++++++++++++++++++++++++
target/arm/internals.h | 6 +
6 files changed, 288 insertions(+), 1 deletion(-)
create mode 100644 gdb-xml/aarch64-mte.xml
diff --git a/configs/targets/aarch64-linux-user.mak b/configs/targets/aarch64-linux-user.mak
index ba8bc5fe3f..8f0ed21d76 100644
--- a/configs/targets/aarch64-linux-user.mak
+++ b/configs/targets/aarch64-linux-user.mak
@@ -1,6 +1,6 @@
TARGET_ARCH=aarch64
TARGET_BASE_ARCH=arm
-TARGET_XML_FILES= gdb-xml/aarch64-core.xml gdb-xml/aarch64-fpu.xml gdb-xml/aarch64-pauth.xml
+TARGET_XML_FILES= gdb-xml/aarch64-core.xml gdb-xml/aarch64-fpu.xml gdb-xml/aarch64-pauth.xml gdb-xml/aarch64-mte.xml
TARGET_HAS_BFLT=y
CONFIG_SEMIHOSTING=y
CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/gdb-xml/aarch64-mte.xml b/gdb-xml/aarch64-mte.xml
new file mode 100644
index 0000000000..4b70b4f17a
--- /dev/null
+++ b/gdb-xml/aarch64-mte.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0"?>
+<!-- Copyright (C) 2021-2023 Free Software Foundation, Inc.
+
+ Copying and distribution of this file, with or without modification,
+ are permitted in any medium without royalty provided the copyright
+ notice and this notice are preserved. -->
+
+<!DOCTYPE feature SYSTEM "gdb-target.dtd">
+<feature name="org.gnu.gdb.aarch64.mte">
+ <reg name="tag_ctl" bitsize="64" type="uint64" group="system" save-restore="no"/>
+</feature>
diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index 35fa281f1b..14d4eca127 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -2518,6 +2518,7 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp)
register_cp_regs_for_features(cpu);
arm_cpu_register_gdb_regs_for_features(cpu);
+ arm_cpu_register_gdb_commands(cpu);
init_cpreg_list(cpu);
diff --git a/target/arm/gdbstub.c b/target/arm/gdbstub.c
index a3bb73cfa7..c3a9b5eb1e 100644
--- a/target/arm/gdbstub.c
+++ b/target/arm/gdbstub.c
@@ -21,6 +21,7 @@
#include "cpu.h"
#include "exec/gdbstub.h"
#include "gdbstub/helpers.h"
+#include "gdbstub/commands.h"
#include "sysemu/tcg.h"
#include "internals.h"
#include "cpu-features.h"
@@ -474,6 +475,41 @@ static GDBFeature *arm_gen_dynamic_m_secextreg_feature(CPUState *cs,
#endif
#endif /* CONFIG_TCG */
+void arm_cpu_register_gdb_commands(ARMCPU *cpu)
+{
+ GArray *query_table =
+ g_array_new(FALSE, FALSE, sizeof(GdbCmdParseEntry));
+ GArray *set_table =
+ g_array_new(FALSE, FALSE, sizeof(GdbCmdParseEntry));
+ GString *qsupported_features = g_string_new(NULL);
+
+ if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {
+ #ifdef TARGET_AARCH64
+ aarch64_cpu_register_gdb_commands(cpu, qsupported_features, query_table,
+ set_table);
+ #endif
+ }
+
+ /* Set arch-specific handlers for 'q' commands. */
+ if (query_table->len) {
+ gdb_extend_query_table(&g_array_index(query_table,
+ GdbCmdParseEntry, 0),
+ query_table->len);
+ }
+
+ /* Set arch-specific handlers for 'Q' commands. */
+ if (set_table->len) {
+ gdb_extend_set_table(&g_array_index(set_table,
+ GdbCmdParseEntry, 0),
+ set_table->len);
+ }
+
+ /* Set arch-specific qSupported feature. */
+ if (qsupported_features->len) {
+ gdb_extend_qsupported_features(qsupported_features->str);
+ }
+}
+
void arm_cpu_register_gdb_regs_for_features(ARMCPU *cpu)
{
CPUState *cs = CPU(cpu);
@@ -507,6 +543,16 @@ void arm_cpu_register_gdb_regs_for_features(ARMCPU *cpu)
gdb_find_static_feature("aarch64-pauth.xml"),
0);
}
+
+#ifdef CONFIG_USER_ONLY
+ /* Memory Tagging Extension (MTE) 'tag_ctl' pseudo-register. */
+ if (cpu_isar_feature(aa64_mte, cpu)) {
+ gdb_register_coprocessor(cs, aarch64_gdb_get_tag_ctl_reg,
+ aarch64_gdb_set_tag_ctl_reg,
+ gdb_find_static_feature("aarch64-mte.xml"),
+ 0);
+ }
+#endif
#endif
} else {
if (arm_feature(env, ARM_FEATURE_NEON)) {
diff --git a/target/arm/gdbstub64.c b/target/arm/gdbstub64.c
index caa31ff3fa..2e2bc2700b 100644
--- a/target/arm/gdbstub64.c
+++ b/target/arm/gdbstub64.c
@@ -21,6 +21,12 @@
#include "cpu.h"
#include "internals.h"
#include "gdbstub/helpers.h"
+#include "gdbstub/commands.h"
+#include "tcg/mte_helper.h"
+#if defined(CONFIG_USER_ONLY) && defined(CONFIG_LINUX)
+#include <sys/prctl.h>
+#include "mte_user_helper.h"
+#endif
int aarch64_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
{
@@ -381,3 +387,220 @@ GDBFeature *arm_gen_dynamic_svereg_feature(CPUState *cs, int base_reg)
return &cpu->dyn_svereg_feature.desc;
}
+
+#ifdef CONFIG_USER_ONLY
+int aarch64_gdb_get_tag_ctl_reg(CPUState *cs, GByteArray *buf, int reg)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+ uint64_t tcf0;
+
+ assert(reg == 0);
+
+ tcf0 = extract64(env->cp15.sctlr_el[1], 38, 2);
+
+ return gdb_get_reg64(buf, tcf0);
+}
+
+int aarch64_gdb_set_tag_ctl_reg(CPUState *cs, uint8_t *buf, int reg)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+
+ uint8_t tcf;
+
+ assert(reg == 0);
+
+ tcf = *buf << PR_MTE_TCF_SHIFT;
+
+ if (!tcf) {
+ return 0;
+ }
+
+ /*
+ * 'tag_ctl' register is actually a "pseudo-register" provided by GDB to
+ * expose options regarding the type of MTE fault that can be controlled at
+ * runtime.
+ */
+ arm_set_mte_tcf0(env, tcf);
+
+ return 1;
+}
+
+static void handle_q_memtag(GArray *params, void *user_ctx)
+{
+ ARMCPU *cpu = ARM_CPU(user_ctx);
+ CPUARMState *env = &cpu->env;
+
+ uint64_t addr = gdb_get_cmd_param(params, 0)->val_ull;
+ uint64_t len = gdb_get_cmd_param(params, 1)->val_ul;
+ int type = gdb_get_cmd_param(params, 2)->val_ul;
+
+ uint8_t *tags;
+ uint8_t addr_tag;
+
+ g_autoptr(GString) str_buf = g_string_new(NULL);
+
+ /*
+ * GDB does not query multiple tags for a memory range on remote targets, so
+ * that's not supported either by gdbstub.
+ */
+ if (len != 1) {
+ gdb_put_packet("E02");
+ }
+
+ /* GDB never queries a tag different from an allocation tag (type 1). */
+ if (type != 1) {
+ gdb_put_packet("E03");
+ }
+
+ /* Note that tags are packed here (2 tags packed in one byte). */
+ tags = allocation_tag_mem_probe(env, 0, addr, MMU_DATA_LOAD, 8 /* 64-bit */,
+ MMU_DATA_LOAD, true, 0);
+ if (!tags) {
+ /* Address is not in a tagged region. */
+ gdb_put_packet("E04");
+ return;
+ }
+
+ /* Unpack tag from byte. */
+ addr_tag = load_tag1(addr, tags);
+ g_string_printf(str_buf, "m%.2x", addr_tag);
+
+ gdb_put_packet(str_buf->str);
+}
+
+static void handle_q_isaddresstagged(GArray *params, void *user_ctx)
+{
+ ARMCPU *cpu = ARM_CPU(user_ctx);
+ CPUARMState *env = &cpu->env;
+
+ uint64_t addr = gdb_get_cmd_param(params, 0)->val_ull;
+
+ uint8_t *tags;
+ const char *reply;
+
+ tags = allocation_tag_mem_probe(env, 0, addr, MMU_DATA_LOAD, 8 /* 64-bit */,
+ MMU_DATA_LOAD, true, 0);
+ reply = tags ? "01" : "00";
+
+ gdb_put_packet(reply);
+}
+
+static void handle_Q_memtag(GArray *params, void *user_ctx)
+{
+ ARMCPU *cpu = ARM_CPU(user_ctx);
+ CPUARMState *env = &cpu->env;
+
+ uint64_t start_addr = gdb_get_cmd_param(params, 0)->val_ull;
+ uint64_t len = gdb_get_cmd_param(params, 1)->val_ul;
+ int type = gdb_get_cmd_param(params, 2)->val_ul;
+ char const *new_tags_str = gdb_get_cmd_param(params, 3)->data;
+
+ uint64_t end_addr;
+
+ int num_new_tags;
+ uint8_t *tags;
+
+ g_autoptr(GByteArray) new_tags = g_byte_array_new();
+
+ /*
+ * Only the allocation tag (i.e. type 1) can be set at the stub side.
+ */
+ if (type != 1) {
+ gdb_put_packet("E02");
+ return;
+ }
+
+ end_addr = start_addr + (len - 1); /* 'len' is always >= 1 */
+ /* Check if request's memory range does not cross page boundaries. */
+ if ((start_addr ^ end_addr) & TARGET_PAGE_MASK) {
+ gdb_put_packet("E03");
+ return;
+ }
+
+ /*
+ * Get all tags in the page starting from the tag of the start address.
+ * Note that there are two tags packed into a single byte here.
+ */
+ tags = allocation_tag_mem_probe(env, 0, start_addr, MMU_DATA_STORE,
+ 8 /* 64-bit */, MMU_DATA_STORE, true, 0);
+ if (!tags) {
+ /* Address is not in a tagged region. */
+ gdb_put_packet("E04");
+ return;
+ }
+
+ /* Convert tags provided by GDB, 2 hex digits per tag. */
+ num_new_tags = strlen(new_tags_str) / 2;
+ gdb_hextomem(new_tags, new_tags_str, num_new_tags);
+
+ uint64_t address = start_addr;
+ int new_tag_index = 0;
+ while (address <= end_addr) {
+ uint8_t new_tag;
+ int packed_index;
+
+ /*
+ * Find packed tag index from unpacked tag index. There are two tags
+ * in one packed index (one tag per nibble).
+ */
+ packed_index = new_tag_index / 2;
+
+ new_tag = new_tags->data[new_tag_index % num_new_tags];
+ store_tag1(address, tags + packed_index, new_tag);
+
+ address += TAG_GRANULE;
+ new_tag_index++;
+ }
+
+ gdb_put_packet("OK");
+}
+
+enum Command {
+ qMemTags,
+ qIsAddressTagged,
+ QMemTags,
+ NUM_CMDS
+};
+
+static GdbCmdParseEntry cmd_handler_table[NUM_CMDS] = {
+ [qMemTags] = {
+ .handler = handle_q_memtag,
+ .cmd_startswith = true,
+ .cmd = "MemTags:",
+ .schema = "L,l:l0",
+ .need_cpu_context = true
+ },
+ [qIsAddressTagged] = {
+ .handler = handle_q_isaddresstagged,
+ .cmd_startswith = true,
+ .cmd = "IsAddressTagged:",
+ .schema = "L0",
+ .need_cpu_context = true
+ },
+ [QMemTags] = {
+ .handler = handle_Q_memtag,
+ .cmd_startswith = true,
+ .cmd = "MemTags:",
+ .schema = "L,l:l:s0",
+ .need_cpu_context = true
+ },
+};
+#endif /* CONFIG_USER_ONLY */
+
+void aarch64_cpu_register_gdb_commands(ARMCPU *cpu, GString *qsupported,
+ GArray *qtable, GArray *stable)
+{
+#ifdef CONFIG_USER_ONLY
+ /* MTE */
+ if (cpu_isar_feature(aa64_mte, cpu)) {
+ g_string_append(qsupported, ";memory-tagging+");
+
+ g_array_append_val(qtable, cmd_handler_table[qMemTags]);
+ g_array_append_val(qtable, cmd_handler_table[qIsAddressTagged]);
+
+ g_array_append_val(stable, cmd_handler_table[QMemTags]);
+ }
+#endif
+}
diff --git a/target/arm/internals.h b/target/arm/internals.h
index 11b5da2562..e1aa1a63b9 100644
--- a/target/arm/internals.h
+++ b/target/arm/internals.h
@@ -358,6 +358,10 @@ void init_cpreg_list(ARMCPU *cpu);
void arm_cpu_register_gdb_regs_for_features(ARMCPU *cpu);
void arm_translate_init(void);
+void arm_cpu_register_gdb_commands(ARMCPU *cpu);
+void aarch64_cpu_register_gdb_commands(ARMCPU *cpu, GString *, GArray *,
+ GArray *);
+
void arm_restore_state_to_opc(CPUState *cs,
const TranslationBlock *tb,
const uint64_t *data);
@@ -1640,6 +1644,8 @@ int aarch64_gdb_get_fpu_reg(CPUState *cs, GByteArray *buf, int reg);
int aarch64_gdb_set_fpu_reg(CPUState *cs, uint8_t *buf, int reg);
int aarch64_gdb_get_pauth_reg(CPUState *cs, GByteArray *buf, int reg);
int aarch64_gdb_set_pauth_reg(CPUState *cs, uint8_t *buf, int reg);
+int aarch64_gdb_get_tag_ctl_reg(CPUState *cs, GByteArray *buf, int reg);
+int aarch64_gdb_set_tag_ctl_reg(CPUState *cs, uint8_t *buf, int reg);
void arm_cpu_sve_finalize(ARMCPU *cpu, Error **errp);
void arm_cpu_sme_finalize(ARMCPU *cpu, Error **errp);
void arm_cpu_pauth_finalize(ARMCPU *cpu, Error **errp);
--
2.34.1© 2016 - 2024 Red Hat, Inc.