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m68k: Fix regression causing Single-Step via GDB/RSP to not single step

Browse source 
A regression that was introduced, with the refactor to TranslatorOps,
drops two lines that update the PC when single-stepping is being performed.

Fixes: 11ab74b01e0a ("target/m68k: Convert to TranslatorOps")

Backports commit 322f244aaa80a5208090d41481c1c09c6face66b from qemu
This commit is contained in:
Laurent Vivier 2020-03-21 12:13:19 -04:00 committed by Lioncash
parent dc9733e555
commit 066f619b02
1 changed files with 29 additions and 15 deletions
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44
qemu/target/m68k/translate.c
View file

@ -288,18 +288,25 @@ static void gen_jmp(DisasContext *s, TCGv dest)
s->base.is_jmp = DISAS_JUMP;
}
static void gen_exception(DisasContext *s, uint32_t dest, int nr)
static void gen_raise_exception(DisasContext *s, int nr)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
TCGv_i32 tmp;
update_cc_op(s);
tcg_gen_movi_i32(tcg_ctx, tcg_ctx->QREG_PC, dest);
tmp = tcg_const_i32(tcg_ctx, nr);
gen_helper_raise_exception(tcg_ctx, tcg_ctx->cpu_env, tmp);
tcg_temp_free_i32(tcg_ctx, tmp);
}
static void gen_exception(DisasContext *s, uint32_t dest, int nr)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
update_cc_op(s);
tcg_gen_movi_i32(tcg_ctx, tcg_ctx->QREG_PC, dest);
gen_raise_exception(s, nr);
s->base.is_jmp = DISAS_NORETURN;
}
@ -6461,29 +6468,36 @@ static void m68k_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
DisasContext *dc = container_of(dcbase, DisasContext, base);
TCGContext *tcg_ctx = dc->uc->tcg_ctx;
if (dc->base.is_jmp == DISAS_NORETURN) {
return;
}
if (dc->base.singlestep_enabled) {
gen_helper_raise_exception(tcg_ctx, tcg_ctx->cpu_env, tcg_const_i32(tcg_ctx, EXCP_DEBUG));
return;
}
switch (dc->base.is_jmp) {
case DISAS_NORETURN:
break;
case DISAS_TOO_MANY:
update_cc_op(dc);
gen_jmp_tb(dc, 0, dc->pc);
if (dc->base.singlestep_enabled) {
tcg_gen_movi_i32(tcg_ctx, tcg_ctx->QREG_PC, dc->pc);
gen_raise_exception(dc, EXCP_DEBUG);
} else {
gen_jmp_tb(dc, 0, dc->pc);
}
break;
case DISAS_JUMP:
/* We updated CC_OP and PC in gen_jmp/gen_jmp_im. */
tcg_gen_lookup_and_goto_ptr(tcg_ctx);
if (dc->base.singlestep_enabled) {
gen_raise_exception(dc, EXCP_DEBUG);
} else {
tcg_gen_lookup_and_goto_ptr(tcg_ctx);
}
break;
case DISAS_EXIT:
/*
* We updated CC_OP and PC in gen_exit_tb, but also modified
* other state that may require returning to the main loop.
*/
tcg_gen_exit_tb(tcg_ctx, NULL, 0);
if (dc->base.singlestep_enabled) {
gen_raise_exception(dc, EXCP_DEBUG);
} else {
tcg_gen_exit_tb(tcg_ctx, NULL, 0);
}
break;
default:
g_assert_not_reached();