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qemu-patch-raspberry4
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user: fix accidental AREG0 use 

Global register AREG0 was always assumed to be usable in user-exec.c,
but this is incorrect for several targets.

Fix with #ifdeffery and by using other variables.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
stable-1.2
Blue Swirl 2012-07-30 15:51:17 +00:00
parent 427a1a2cb1
commit 1846ec2c6a
1 changed files with 12 additions and 5 deletions
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17
user-exec.c
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@ -18,7 +18,9 @@
*/
#include "config.h"
#include "cpu.h"
#ifndef CONFIG_TCG_PASS_AREG0
#include "dyngen-exec.h"
#endif
#include "disas.h"
#include "tcg.h"
@ -58,9 +60,11 @@ void cpu_resume_from_signal(CPUArchState *env1, void *puc)
struct sigcontext *uc = puc;
#endif
#ifndef CONFIG_TCG_PASS_AREG0
env = env1;
/* XXX: restore cpu registers saved in host registers */
#endif
if (puc) {
/* XXX: use siglongjmp ? */
@ -74,8 +78,8 @@ void cpu_resume_from_signal(CPUArchState *env1, void *puc)
sigprocmask(SIG_SETMASK, &uc->sc_mask, NULL);
#endif
}
env->exception_index = -1;
longjmp(env->jmp_env, 1);
env1->exception_index = -1;
longjmp(env1->jmp_env, 1);
}
/* 'pc' is the host PC at which the exception was raised. 'address' is
@ -89,9 +93,11 @@ static inline int handle_cpu_signal(uintptr_t pc, unsigned long address,
TranslationBlock *tb;
int ret;
#ifndef CONFIG_TCG_PASS_AREG0
if (cpu_single_env) {
env = cpu_single_env; /* XXX: find a correct solution for multithread */
}
#endif
#if defined(DEBUG_SIGNAL)
qemu_printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
pc, address, is_write, *(unsigned long *)old_set);
@ -103,7 +109,8 @@ static inline int handle_cpu_signal(uintptr_t pc, unsigned long address,
}
/* see if it is an MMU fault */
ret = cpu_handle_mmu_fault(env, address, is_write, MMU_USER_IDX);
ret = cpu_handle_mmu_fault(cpu_single_env, address, is_write,
MMU_USER_IDX);
if (ret < 0) {
return 0; /* not an MMU fault */
}
@ -115,13 +122,13 @@ static inline int handle_cpu_signal(uintptr_t pc, unsigned long address,
if (tb) {
/* the PC is inside the translated code. It means that we have
a virtual CPU fault */
cpu_restore_state(tb, env, pc);
cpu_restore_state(tb, cpu_single_env, pc);
}
/* we restore the process signal mask as the sigreturn should
do it (XXX: use sigsetjmp) */
sigprocmask(SIG_SETMASK, old_set, NULL);
exception_action(env);
exception_action(cpu_single_env);
/* never comes here */
return 1;