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target/ppc: Drop exit checks for singlestep_enabled 

GDB single-stepping is now handled generically.
Reuse gen_debug_exception to handle architectural debug exceptions.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-07-19 14:26:48 -10:00
parent b21fce536c
commit 9498d1032c
1 changed files with 8 additions and 30 deletions
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38
target/ppc/translate.c
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@ -42,7 +42,6 @@
#define CPU_SINGLE_STEP 0x1
#define CPU_BRANCH_STEP 0x2
#define GDBSTUB_SINGLE_STEP 0x4
/* Include definitions for instructions classes and implementations flags */
/* #define PPC_DEBUG_DISAS */
@ -333,7 +332,7 @@ static uint32_t gen_prep_dbgex(DisasContext *ctx)
static void gen_debug_exception(DisasContext *ctx)
{
gen_helper_raise_exception(cpu_env, tcg_constant_i32(EXCP_DEBUG));
gen_helper_raise_exception(cpu_env, tcg_constant_i32(gen_prep_dbgex(ctx)));
ctx->base.is_jmp = DISAS_NORETURN;
}
@ -4309,15 +4308,8 @@ static inline bool use_goto_tb(DisasContext *ctx, target_ulong dest)
static void gen_lookup_and_goto_ptr(DisasContext *ctx)
{
int sse = ctx->singlestep_enabled;
if (unlikely(sse)) {
if (sse & GDBSTUB_SINGLE_STEP) {
gen_debug_exception(ctx);
} else if (sse & (CPU_SINGLE_STEP | CPU_BRANCH_STEP)) {
gen_helper_raise_exception(cpu_env, tcg_constant_i32(gen_prep_dbgex(ctx)));
} else {
tcg_gen_exit_tb(NULL, 0);
}
if (unlikely(ctx->singlestep_enabled)) {
gen_debug_exception(ctx);
} else {
tcg_gen_lookup_and_goto_ptr();
}
@ -8563,17 +8555,11 @@ static void ppc_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
ctx->singlestep_enabled = 0;
if ((hflags >> HFLAGS_SE) & 1) {
ctx->singlestep_enabled |= CPU_SINGLE_STEP;
ctx->base.max_insns = 1;
}
if ((hflags >> HFLAGS_BE) & 1) {
ctx->singlestep_enabled |= CPU_BRANCH_STEP;
}
if (unlikely(ctx->base.singlestep_enabled)) {
ctx->singlestep_enabled |= GDBSTUB_SINGLE_STEP;
}
if (ctx->singlestep_enabled & (CPU_SINGLE_STEP | GDBSTUB_SINGLE_STEP)) {
ctx->base.max_insns = 1;
}
}
static void ppc_tr_tb_start(DisasContextBase *db, CPUState *cs)
@ -8642,7 +8628,6 @@ static void ppc_tr_tb_stop(DisasContextBase *dcbase, CPUState *cs)
DisasContext *ctx = container_of(dcbase, DisasContext, base);
DisasJumpType is_jmp = ctx->base.is_jmp;
target_ulong nip = ctx->base.pc_next;
int sse;
if (is_jmp == DISAS_NORETURN) {
/* We have already exited the TB. */
@ -8650,8 +8635,8 @@ static void ppc_tr_tb_stop(DisasContextBase *dcbase, CPUState *cs)
}
/* Honor single stepping. */
sse = ctx->singlestep_enabled & (CPU_SINGLE_STEP | GDBSTUB_SINGLE_STEP);
if (unlikely(sse)) {
if (unlikely(ctx->singlestep_enabled & CPU_SINGLE_STEP)
&& (nip <= 0x100 || nip > 0xf00)) {
switch (is_jmp) {
case DISAS_TOO_MANY:
case DISAS_EXIT_UPDATE:
@ -8665,15 +8650,8 @@ static void ppc_tr_tb_stop(DisasContextBase *dcbase, CPUState *cs)
g_assert_not_reached();
}
if (sse & GDBSTUB_SINGLE_STEP) {
gen_debug_exception(ctx);
return;
}
/* else CPU_SINGLE_STEP... */
if (nip <= 0x100 || nip > 0xf00) {
gen_helper_raise_exception(cpu_env, tcg_constant_i32(gen_prep_dbgex(ctx)));
return;
}
gen_debug_exception(ctx);
return;
}
switch (is_jmp) {