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target/ppc: check tb_env != 0 before printing TBU/TBL/DECR

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When using "-machine none", env->tb_env is not allocated, causing the
segmentation fault reported in issue #85 (launchpad bug #811683). To
avoid this problem, check if the pointer != NULL before calling the
methods to print TBU/TBL/DECR.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/85
Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <20220714172343.80539-1-matheus.ferst@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
This commit is contained in:
Matheus Ferst 2022-07-14 14:23:43 -03:00 committed by Daniel Henrique Barboza
parent 491a25535c
commit 3778aa970f
2 changed files with 17 additions and 10 deletions
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18
target/ppc/cpu_init.c
View file

@ -7471,17 +7471,15 @@ void ppc_cpu_dump_state(CPUState *cs, FILE *f, int flags)
"%08x iidx %d didx %d\n",
env->msr, env->spr[SPR_HID0], env->hflags,
cpu_mmu_index(env, true), cpu_mmu_index(env, false));
#if !defined(NO_TIMER_DUMP)
qemu_fprintf(f, "TB %08" PRIu32 " %08" PRIu64
#if !defined(CONFIG_USER_ONLY)
" DECR " TARGET_FMT_lu
#endif
"\n",
cpu_ppc_load_tbu(env), cpu_ppc_load_tbl(env)
#if !defined(CONFIG_USER_ONLY)
, cpu_ppc_load_decr(env)
#endif
);
if (env->tb_env) {
qemu_fprintf(f, "TB %08" PRIu32 " %08" PRIu64
" DECR " TARGET_FMT_lu "\n", cpu_ppc_load_tbu(env),
cpu_ppc_load_tbl(env), cpu_ppc_load_decr(env));
}
#else
qemu_fprintf(f, "TB %08" PRIu32 " %08" PRIu64 "\n", cpu_ppc_load_tbu(env),
cpu_ppc_load_tbl(env));
#endif
for (i = 0; i < 32; i++) {
if ((i & (RGPL - 1)) == 0) {

9
target/ppc/monitor.c
View file

@ -55,6 +55,9 @@ static target_long monitor_get_decr(Monitor *mon, const struct MonitorDef *md,
int val)
{
CPUArchState *env = mon_get_cpu_env(mon);
if (!env->tb_env) {
return 0;
}
return cpu_ppc_load_decr(env);
}
@ -62,6 +65,9 @@ static target_long monitor_get_tbu(Monitor *mon, const struct MonitorDef *md,
int val)
{
CPUArchState *env = mon_get_cpu_env(mon);
if (!env->tb_env) {
return 0;
}
return cpu_ppc_load_tbu(env);
}
@ -69,6 +75,9 @@ static target_long monitor_get_tbl(Monitor *mon, const struct MonitorDef *md,
int val)
{
CPUArchState *env = mon_get_cpu_env(mon);
if (!env->tb_env) {
return 0;
}
return cpu_ppc_load_tbl(env);
}