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target/mips: Extract trap code into env->error_code 

Simplify cpu_loop by doing all of the decode in translate.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220107213243.212806-18-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
staging
Richard Henderson 2022-01-07 13:32:36 -08:00 committed by Laurent Vivier
parent 6f3533dd1b
commit 0a3336f6fd
4 changed files with 25 additions and 48 deletions
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41
linux-user/mips/cpu_loop.c
View File

@ -197,51 +197,12 @@ done_syscall:
do_tr_or_bp(env, code, false);
break;
case EXCP_TRAP:
{
abi_ulong trap_instr;
unsigned int code = 0;
/*
* 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) {
/* microMIPS mode */
abi_ulong instr[2];
ret = get_user_u16(instr[0], env->active_tc.PC) ||
get_user_u16(instr[1], env->active_tc.PC + 2);
trap_instr = (instr[0] << 16) | instr[1];
} else {
ret = get_user_u32(trap_instr, env->active_tc.PC);
}
if (ret != 0) {
goto error;
}
/* The immediate versions don't provide a code. */
if (!(trap_instr & 0xFC000000)) {
if (env->hflags & MIPS_HFLAG_M16) {
/* microMIPS mode */
code = ((trap_instr >> 12) & ((1 << 4) - 1));
} else {
code = ((trap_instr >> 6) & ((1 << 10) - 1));
}
}
do_tr_or_bp(env, code, true);
}
do_tr_or_bp(env, env->error_code, true);
break;
case EXCP_ATOMIC:
cpu_exec_step_atomic(cs);
break;
default:
error:
EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
abort();
}

4
target/mips/tcg/micromips_translate.c.inc
View File

@ -1047,7 +1047,7 @@ static void gen_pool32axf(CPUMIPSState *env, DisasContext *ctx, int rt, int rs)
case TNE:
mips32_op = OPC_TNE;
do_trap:
gen_trap(ctx, mips32_op, rs, rt, -1);
gen_trap(ctx, mips32_op, rs, rt, -1, extract32(ctx->opcode, 12, 4));
break;
#ifndef CONFIG_USER_ONLY
case MFC0:
@ -2439,7 +2439,7 @@ static void decode_micromips32_opc(CPUMIPSState *env, DisasContext *ctx)
check_insn_opc_removed(ctx, ISA_MIPS_R6);
mips32_op = OPC_TEQI;
do_trapi:
gen_trap(ctx, mips32_op, rs, -1, imm);
gen_trap(ctx, mips32_op, rs, -1, imm, 0);
break;
case BNEZC:

4
target/mips/tcg/nanomips_translate.c.inc
View File

@ -1268,11 +1268,11 @@ static void gen_pool32a0_nanomips_insn(CPUMIPSState *env, DisasContext *ctx)
switch (extract32(ctx->opcode, 10, 1)) {
case NM_TEQ:
check_nms(ctx);
gen_trap(ctx, OPC_TEQ, rs, rt, -1);
gen_trap(ctx, OPC_TEQ, rs, rt, -1, rd);
break;
case NM_TNE:
check_nms(ctx);
gen_trap(ctx, OPC_TNE, rs, rt, -1);
gen_trap(ctx, OPC_TNE, rs, rt, -1, rd);
break;
}
break;

24
target/mips/tcg/translate.c
View File

@ -4733,7 +4733,7 @@ static void gen_loongson_lsdc2(DisasContext *ctx, int rt,
/* Traps */
static void gen_trap(DisasContext *ctx, uint32_t opc,
int rs, int rt, int16_t imm)
int rs, int rt, int16_t imm, int code)
{
int cond;
TCGv t0 = tcg_temp_new();
@ -4778,6 +4778,11 @@ static void gen_trap(DisasContext *ctx, uint32_t opc,
case OPC_TGEU: /* rs >= rs unsigned */
case OPC_TGEIU: /* r0 >= 0 unsigned */
/* Always trap */
#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_TRAP);
break;
case OPC_TLT: /* rs < rs */
@ -4818,6 +4823,18 @@ static void gen_trap(DisasContext *ctx, uint32_t opc,
tcg_gen_brcond_tl(TCG_COND_EQ, t0, t1, l1);
break;
}
#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
/* Like save_cpu_state, only don't update saved values. */
if (ctx->base.pc_next != ctx->saved_pc) {
gen_save_pc(ctx->base.pc_next);
}
if (ctx->hflags != ctx->saved_hflags) {
tcg_gen_movi_i32(hflags, ctx->hflags);
}
generate_exception(ctx, EXCP_TRAP);
gen_set_label(l1);
}
@ -14155,7 +14172,7 @@ static void decode_opc_special(CPUMIPSState *env, DisasContext *ctx)
case OPC_TEQ:
case OPC_TNE:
check_insn(ctx, ISA_MIPS2);
gen_trap(ctx, op1, rs, rt, -1);
gen_trap(ctx, op1, rs, rt, -1, extract32(ctx->opcode, 6, 10));
break;
case OPC_PMON:
/* Pmon entry point, also R4010 selsl */
@ -15289,11 +15306,10 @@ static bool decode_opc_legacy(CPUMIPSState *env, DisasContext *ctx)
case OPC_TLTI:
case OPC_TLTIU:
case OPC_TEQI:
case OPC_TNEI:
check_insn(ctx, ISA_MIPS2);
check_insn_opc_removed(ctx, ISA_MIPS_R6);
gen_trap(ctx, op1, rs, -1, imm);
gen_trap(ctx, op1, rs, -1, imm, 0);
break;
case OPC_SIGRIE:
check_insn(ctx, ISA_MIPS_R6);