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X-Received-From: 216.71.153.144 Subject: [Qemu-devel] [PATCH v1 10/23] riscv: tcg-target: Add the relocation functions X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "alistair23@gmail.com" , "richard.henderson@linaro.org" , Alistair Francis Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (found 2 invalid signatures) Content-Type: text/plain; charset="utf-8" Signed-off-by: Alistair Francis Signed-off-by: Michael Clark Signed-off-by: Richard Henderson --- tcg/riscv/tcg-target.inc.c | 75 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) diff --git a/tcg/riscv/tcg-target.inc.c b/tcg/riscv/tcg-target.inc.c index d198cfd5f7..e6ad5f8e4c 100644 --- a/tcg/riscv/tcg-target.inc.c +++ b/tcg/riscv/tcg-target.inc.c @@ -422,3 +422,78 @@ static void tcg_out_nop_fill(tcg_insn_unit *p, int cou= nt) p[i] =3D encode_i(OPC_ADDI, TCG_REG_ZERO, TCG_REG_ZERO, 0); } } + +/* + * Relocations + */ + +static void reloc_sbimm12(tcg_insn_unit *code_ptr, tcg_insn_unit *target) +{ + intptr_t offset =3D (intptr_t)target - (intptr_t)code_ptr; + tcg_debug_assert(offset =3D=3D sextreg(offset, 1, 12) << 1); + + code_ptr[0] |=3D encode_sbimm12(offset); +} + +static void reloc_jimm20(tcg_insn_unit *code_ptr, tcg_insn_unit *target) +{ + intptr_t offset =3D (intptr_t)target - (intptr_t)code_ptr; + tcg_debug_assert(offset =3D=3D sextreg(offset, 1, 20) << 1); + + code_ptr[0] |=3D encode_ujimm20(offset); +} + +static void reloc_call(tcg_insn_unit *code_ptr, tcg_insn_unit *target) +{ + intptr_t offset =3D (intptr_t)target - (intptr_t)code_ptr; + int32_t lo =3D sextreg(offset, 0, 12); + int32_t hi =3D offset - lo; + + tcg_debug_assert(offset =3D=3D hi + lo); + + code_ptr[0] |=3D encode_uimm20(hi); + code_ptr[1] |=3D encode_imm12(lo); +} + +static void patch_reloc(tcg_insn_unit *code_ptr, int type, + intptr_t value, intptr_t addend) +{ + uint32_t insn =3D *code_ptr; + intptr_t diff; + bool short_jmp; + + tcg_debug_assert(addend =3D=3D 0); + + switch (type) { + case R_RISCV_BRANCH: + diff =3D value - (uintptr_t)code_ptr; + short_jmp =3D diff =3D=3D sextreg(diff, 0, 12); + if (short_jmp) { + reloc_sbimm12(code_ptr, (tcg_insn_unit *)value); + } else { + /* Invert the condition */ + insn =3D insn ^ (1 << 12); + /* Clear the offset */ + insn &=3D 0x01fff07f; + /* Set the offset to the PC + 8 */ + insn |=3D encode_sbimm12(8); + + /* Move forward */ + code_ptr[0] =3D insn; + + /* Overwrite the NOP with jal x0,value */ + diff =3D value - (uintptr_t)(code_ptr + 1); + insn =3D encode_uj(OPC_JAL, TCG_REG_ZERO, diff); + code_ptr[1] =3D insn; + } + break; + case R_RISCV_JAL: + reloc_jimm20(code_ptr, (tcg_insn_unit *)value); + break; + case R_RISCV_CALL: + reloc_call(code_ptr, (tcg_insn_unit *)value); + break; + default: + tcg_abort(); + } +} --=20 2.19.1