From: Timothy E Baldwin <t.e.baldwi...@members.leeds.ac.uk>
Update the Alpha main loop and sigreturn code:
* on TARGET_ERESTARTSYS, wind guest PC backwards to repeat syscall insn
* handle TARGET_QEMU_ESIGRETURN in the main loop as the indication
that the main loop should not touch any guest CPU state
Signed-off-by: Timothy Edward Baldwin <t.e.baldwi...@members.leeds.ac.uk>
Message-id: 1441497448-32489-13-git-send-email-t.e.baldwi...@members.leeds.ac.uk
Reviewed-by: Peter Maydell <peter.mayd...@linaro.org>
[PMM: tweak commit message; drop TARGET_USE_ERESTARTSYS define;
PC is env->pc, not env->ir[IR_PV]]
Signed-off-by: Peter Maydell <peter.mayd...@linaro.org>
Signed-off-by: Riku Voipio <riku.voi...@linaro.org>
---
linux-user/alpha/target_signal.h | 1 +
linux-user/main.c | 7 +++++--
linux-user/signal.c | 4 ++--
3 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/linux-user/alpha/target_signal.h b/linux-user/alpha/target_signal.h
index d3822da..4c78319 100644
--- a/linux-user/alpha/target_signal.h
+++ b/linux-user/alpha/target_signal.h
@@ -27,6 +27,7 @@ static inline abi_ulong get_sp_from_cpustate(CPUAlphaState
*state)
return state->ir[IR_SP];
}
+
/* From <asm/gentrap.h>. */
#define TARGET_GEN_INTOVF -1 /* integer overflow */
#define TARGET_GEN_INTDIV -2 /* integer division by zero */
diff --git a/linux-user/main.c b/linux-user/main.c
index 75552a0..cc7f2aa 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -3267,8 +3267,11 @@ void cpu_loop(CPUAlphaState *env)
env->ir[IR_A2], env->ir[IR_A3],
env->ir[IR_A4], env->ir[IR_A5],
0, 0);
- if (trapnr == TARGET_NR_sigreturn
- || trapnr == TARGET_NR_rt_sigreturn) {
+ if (sysret == -TARGET_ERESTARTSYS) {
+ env->pc -= 4;
+ break;
+ }
+ if (sysret == -TARGET_QEMU_ESIGRETURN) {
break;
}
/* Syscall writes 0 to V0 to bypass error check, similar
diff --git a/linux-user/signal.c b/linux-user/signal.c
index 8b5ddf2..559e764 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -5527,7 +5527,7 @@ long do_sigreturn(CPUAlphaState *env)
restore_sigcontext(env, sc);
unlock_user_struct(sc, sc_addr, 0);
- return env->ir[IR_V0];
+ return -TARGET_QEMU_ESIGRETURN;
badframe:
force_sig(TARGET_SIGSEGV);
@@ -5554,7 +5554,7 @@ long do_rt_sigreturn(CPUAlphaState *env)
}
unlock_user_struct(frame, frame_addr, 0);
- return env->ir[IR_V0];
+ return -TARGET_QEMU_ESIGRETURN;
badframe:
--
2.1.4
