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[PATCH v3 17/25] target/mips: Extract break code into env->error_code
From: |
Richard Henderson |
Subject: |
[PATCH v3 17/25] target/mips: Extract break code into env->error_code |
Date: |
Sat, 18 Sep 2021 18:57:10 -0700 |
Simplify cpu_loop by doing all of the decode in translate.
This fixes a bug in that cpu_loop was not handling the
different layout of the R6 version of break16. This fixes
a bug in that cpu_loop extracted the wrong bits for the
mips16e break16 instruction.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/mips/tcg/translate.h | 1 +
linux-user/mips/cpu_loop.c | 73 +++--------------------
target/mips/tcg/translate.c | 12 +++-
target/mips/tcg/micromips_translate.c.inc | 6 +-
target/mips/tcg/mips16e_translate.c.inc | 2 +-
5 files changed, 25 insertions(+), 69 deletions(-)
diff --git a/target/mips/tcg/translate.h b/target/mips/tcg/translate.h
index 6111493651..ae01515efe 100644
--- a/target/mips/tcg/translate.h
+++ b/target/mips/tcg/translate.h
@@ -129,6 +129,7 @@ enum {
void generate_exception(DisasContext *ctx, int excp);
void generate_exception_err(DisasContext *ctx, int excp, int err);
void generate_exception_end(DisasContext *ctx, int excp);
+void generate_exception_break(DisasContext *ctx, int code);
void gen_reserved_instruction(DisasContext *ctx);
void check_insn(DisasContext *ctx, uint64_t flags);
diff --git a/linux-user/mips/cpu_loop.c b/linux-user/mips/cpu_loop.c
index e9d9208e83..c105b00eac 100644
--- a/linux-user/mips/cpu_loop.c
+++ b/linux-user/mips/cpu_loop.c
@@ -64,6 +64,7 @@ void cpu_loop(CPUMIPSState *env)
{
CPUState *cs = env_cpu(env);
int trapnr, si_code;
+ unsigned int code;
abi_long ret;
# ifdef TARGET_ABI_MIPSO32
unsigned int syscall_num;
@@ -184,71 +185,15 @@ done_syscall:
* handling code in arch/mips/kernel/traps.c.
*/
case EXCP_BREAK:
- {
- abi_ulong trap_instr;
- unsigned int code;
-
- /*
- * FIXME: It would be better to decode the trap number
- * during translate, and store it in error_code while
- * raising the exception. We should not be re-reading
- * the opcode here.
- */
-
- if (env->hflags & MIPS_HFLAG_M16) {
- if (env->insn_flags & ASE_MICROMIPS) {
- /* microMIPS mode */
- ret = get_user_u16(trap_instr, env->active_tc.PC);
- if (ret != 0) {
- goto error;
- }
-
- if ((trap_instr >> 10) == 0x11) {
- /* 16-bit instruction */
- code = trap_instr & 0xf;
- } else {
- /* 32-bit instruction */
- abi_ulong instr_lo;
-
- ret = get_user_u16(instr_lo,
- env->active_tc.PC + 2);
- if (ret != 0) {
- goto error;
- }
- trap_instr = (trap_instr << 16) | instr_lo;
- code = ((trap_instr >> 6) & ((1 << 20) - 1));
- /* Unfortunately, microMIPS also suffers from
- the old assembler bug... */
- if (code >= (1 << 10)) {
- code >>= 10;
- }
- }
- } else {
- /* MIPS16e mode */
- ret = get_user_u16(trap_instr, env->active_tc.PC);
- if (ret != 0) {
- goto error;
- }
- code = (trap_instr >> 6) & 0x3f;
- }
- } else {
- ret = get_user_u32(trap_instr, env->active_tc.PC);
- if (ret != 0) {
- goto error;
- }
-
- /* As described in the original Linux kernel code, the
- * below checks on 'code' are to work around an old
- * assembly bug.
- */
- code = ((trap_instr >> 6) & ((1 << 20) - 1));
- if (code >= (1 << 10)) {
- code >>= 10;
- }
- }
-
- do_tr_or_bp(env, code, false);
+ /*
+ * As described in the original Linux kernel code, the below
+ * checks on 'code' are to work around an old assembly bug.
+ */
+ code = env->error_code;
+ if (code >= (1 << 10)) {
+ code >>= 10;
}
+ do_tr_or_bp(env, code, false);
break;
case EXCP_TRAP:
{
diff --git a/target/mips/tcg/translate.c b/target/mips/tcg/translate.c
index 148afec9dc..e17bcd24db 100644
--- a/target/mips/tcg/translate.c
+++ b/target/mips/tcg/translate.c
@@ -1367,6 +1367,16 @@ void generate_exception_end(DisasContext *ctx, int excp)
generate_exception_err(ctx, excp, 0);
}
+void generate_exception_break(DisasContext *ctx, int code)
+{
+#ifdef CONFIG_USER_ONLY
+ /* Pass the break code along to cpu_loop. */
+ tcg_gen_st_i32(tcg_constant_i32(code), cpu_env,
+ offsetof(CPUMIPSState, error_code));
+#endif
+ generate_exception_end(ctx, EXCP_BREAK);
+}
+
void gen_reserved_instruction(DisasContext *ctx)
{
generate_exception_end(ctx, EXCP_RI);
@@ -14176,7 +14186,7 @@ static void decode_opc_special(CPUMIPSState *env,
DisasContext *ctx)
generate_exception_end(ctx, EXCP_SYSCALL);
break;
case OPC_BREAK:
- generate_exception_end(ctx, EXCP_BREAK);
+ generate_exception_break(ctx, extract32(ctx->opcode, 6, 20));
break;
case OPC_SYNC:
check_insn(ctx, ISA_MIPS2);
diff --git a/target/mips/tcg/micromips_translate.c.inc
b/target/mips/tcg/micromips_translate.c.inc
index 0da4c802a3..f91f7a96cd 100644
--- a/target/mips/tcg/micromips_translate.c.inc
+++ b/target/mips/tcg/micromips_translate.c.inc
@@ -822,7 +822,7 @@ static void gen_pool16c_insn(DisasContext *ctx)
gen_HILO(ctx, OPC_MFLO, 0, uMIPS_RS5(ctx->opcode));
break;
case BREAK16:
- generate_exception_end(ctx, EXCP_BREAK);
+ generate_exception_break(ctx, extract32(ctx->opcode, 0, 4));
break;
case SDBBP16:
if (is_uhi(extract32(ctx->opcode, 0, 4))) {
@@ -937,7 +937,7 @@ static void gen_pool16c_r6_insn(DisasContext *ctx)
break;
case R6_BREAK16:
/* BREAK16 */
- generate_exception(ctx, EXCP_BREAK);
+ generate_exception_break(ctx, extract32(ctx->opcode, 6, 4));
break;
case R6_SDBBP16:
/* SDBBP16 */
@@ -1812,7 +1812,7 @@ static void decode_micromips32_opc(CPUMIPSState *env,
DisasContext *ctx)
gen_pool32axf(env, ctx, rt, rs);
break;
case BREAK32:
- generate_exception_end(ctx, EXCP_BREAK);
+ generate_exception_break(ctx, extract32(ctx->opcode, 6, 20));
break;
case SIGRIE:
check_insn(ctx, ISA_MIPS_R6);
diff --git a/target/mips/tcg/mips16e_translate.c.inc
b/target/mips/tcg/mips16e_translate.c.inc
index 84d816603a..f57e0a5f2a 100644
--- a/target/mips/tcg/mips16e_translate.c.inc
+++ b/target/mips/tcg/mips16e_translate.c.inc
@@ -969,7 +969,7 @@ static int decode_ase_mips16e(CPUMIPSState *env,
DisasContext *ctx)
gen_slt(ctx, OPC_SLTU, 24, rx, ry);
break;
case RR_BREAK:
- generate_exception_end(ctx, EXCP_BREAK);
+ generate_exception_break(ctx, extract32(ctx->opcode, 5, 6));
break;
case RR_SLLV:
gen_shift(ctx, OPC_SLLV, ry, rx, ry);
--
2.25.1
- [PATCH v3 04/25] linux-user/alpha: Set FPE_FLTUNK for gentrap ROPRAND, (continued)
- [PATCH v3 04/25] linux-user/alpha: Set FPE_FLTUNK for gentrap ROPRAND, Richard Henderson, 2021/09/18
- [PATCH v3 02/25] linux-user/aarch64: Use force_sig_fault(), Richard Henderson, 2021/09/18
- [PATCH v3 05/25] linux-user/alpha: Use force_sig_fault, Richard Henderson, 2021/09/18
- [PATCH v3 06/25] linux-user/cris: Use force_sig_fault, Richard Henderson, 2021/09/18
- [PATCH v3 10/25] linux-user/i386: Split out maybe_handle_vm86_trap, Richard Henderson, 2021/09/18
- [PATCH v3 07/25] linux-user/hppa: Use force_sig_fault, Richard Henderson, 2021/09/18
- [PATCH v3 08/25] linux-user/hppa: Use the proper si_code for PRIV_OPR, PRIV_REG, OVERFLOW, Richard Henderson, 2021/09/18
- [PATCH v3 11/25] linux-user/i386: Use force_sig, force_sig_fault, Richard Henderson, 2021/09/18
- [PATCH v3 14/25] linux-user/microblaze: Fix SIGFPE si_codes, Richard Henderson, 2021/09/18
- [PATCH v3 09/25] linux-user/hppa: Set FPE_CONDTRAP for COND, Richard Henderson, 2021/09/18
- [PATCH v3 17/25] target/mips: Extract break code into env->error_code,
Richard Henderson <=
- [PATCH v3 12/25] linux-user/m68k: Use force_sig_fault, Richard Henderson, 2021/09/18
- [PATCH v3 13/25] linux-user/microblaze: Use force_sig_fault, Richard Henderson, 2021/09/18
- [PATCH v3 16/25] linux-user/mips: Use force_sig_fault, Richard Henderson, 2021/09/18
- [PATCH v3 22/25] linux-user/s390x: Use force_sig_fault, Richard Henderson, 2021/09/18
- [PATCH v3 24/25] linux-user/sparc: Use force_sig_fault, Richard Henderson, 2021/09/18
- [PATCH v3 15/25] linux-user/mips: Improve do_break, Richard Henderson, 2021/09/18
- [PATCH v3 19/25] linux-user/openrisc: Use force_sig_fault, Richard Henderson, 2021/09/18
- [PATCH v3 18/25] target/mips: Extract trap code into env->error_code, Richard Henderson, 2021/09/18
- [PATCH v3 23/25] linux-user/sh4: Use force_sig_fault, Richard Henderson, 2021/09/18
- [PATCH v3 21/25] linux-user/riscv: Use force_sig_fault, Richard Henderson, 2021/09/18