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linux-user: Add cpu_loop_exit_sigsegv

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This is a new interface to be provided by the os emulator for
raising SIGSEGV on fault.  Use the new record_sigsegv target hook.

Reviewed by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-09-17 17:32:56 -07:00
parent 09e94676ad
commit 72d2bbf9ff
3 changed files with 55 additions and 23 deletions
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33
accel/tcg/user-exec.c
View file

@ -141,35 +141,38 @@ static int probe_access_internal(CPUArchState *env, target_ulong addr,
int fault_size, MMUAccessType access_type,
bool nonfault, uintptr_t ra)
{
int flags;
int acc_flag;
bool maperr;
switch (access_type) {
case MMU_DATA_STORE:
flags = PAGE_WRITE;
acc_flag = PAGE_WRITE_ORG;
break;
case MMU_DATA_LOAD:
flags = PAGE_READ;
acc_flag = PAGE_READ;
break;
case MMU_INST_FETCH:
flags = PAGE_EXEC;
acc_flag = PAGE_EXEC;
break;
default:
g_assert_not_reached();
}
if (!guest_addr_valid_untagged(addr) ||
page_check_range(addr, 1, flags) < 0) {
if (nonfault) {
return TLB_INVALID_MASK;
} else {
CPUState *cpu = env_cpu(env);
CPUClass *cc = CPU_GET_CLASS(cpu);
cc->tcg_ops->tlb_fill(cpu, addr, fault_size, access_type,
MMU_USER_IDX, false, ra);
g_assert_not_reached();
if (guest_addr_valid_untagged(addr)) {
int page_flags = page_get_flags(addr);
if (page_flags & acc_flag) {
return 0; /* success */
}
maperr = !(page_flags & PAGE_VALID);
} else {
maperr = true;
}
return 0;
if (nonfault) {
return TLB_INVALID_MASK;
}
cpu_loop_exit_sigsegv(env_cpu(env), addr, access_type, maperr, ra);
}
int probe_access_flags(CPUArchState *env, target_ulong addr,