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

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

Fixes: 11ab74b01e ("target/m68k: Convert to TranslatorOps")
Reported-by: Lucien Murray-Pitts <lucienmp_antispam@yahoo.com>
Suggested-by: Lucien Murray-Pitts <lucienmp_antispam@yahoo.com>
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20200116165454.2076265-1-laurent@vivier.eu>
(cherry picked from commit 322f244aaa)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
stable-4.2
Laurent Vivier 2020-01-16 17:54:54 +01:00 committed by Michael Roth
parent b5ba361d8f
commit c44015c50c
1 changed files with 27 additions and 15 deletions
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42
target/m68k/translate.c
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@ -289,16 +289,21 @@ 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(int nr)
{
TCGv_i32 tmp;
update_cc_op(s);
tcg_gen_movi_i32(QREG_PC, dest);
tmp = tcg_const_i32(nr);
gen_helper_raise_exception(cpu_env, tmp);
tcg_temp_free_i32(tmp);
}
static void gen_exception(DisasContext *s, uint32_t dest, int nr)
{
update_cc_op(s);
tcg_gen_movi_i32(QREG_PC, dest);
gen_raise_exception(nr);
s->base.is_jmp = DISAS_NORETURN;
}
@ -6198,29 +6203,36 @@ static void m68k_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
{
DisasContext *dc = container_of(dcbase, DisasContext, base);
if (dc->base.is_jmp == DISAS_NORETURN) {
return;
}
if (dc->base.singlestep_enabled) {
gen_helper_raise_exception(cpu_env, tcg_const_i32(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(QREG_PC, dc->pc);
gen_raise_exception(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();
if (dc->base.singlestep_enabled) {
gen_raise_exception(EXCP_DEBUG);
} else {
tcg_gen_lookup_and_goto_ptr();
}
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(NULL, 0);
if (dc->base.singlestep_enabled) {
gen_raise_exception(EXCP_DEBUG);
} else {
tcg_gen_exit_tb(NULL, 0);
}
break;
default:
g_assert_not_reached();