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[Qemu-devel] [PATCH v2 12/28] linux-user: Support for restarting system
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [PATCH v2 12/28] linux-user: Support for restarting system calls for Alpha targets |
Date: |
Thu, 12 May 2016 18:47:36 +0100 |
From: Timothy E Baldwin <address@hidden>
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 <address@hidden>
Message-id: address@hidden
Reviewed-by: Peter Maydell <address@hidden>
[PMM: tweak commit message; drop TARGET_USE_ERESTARTSYS define;
PC is env->pc, not env->ir[IR_PV]]
Signed-off-by: Peter Maydell <address@hidden>
---
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 c2dc4b2..94dc2d4 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -3266,8 +3266,11 @@ 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:
--
1.9.1
- [Qemu-devel] [PATCH v2 13/28] linux-user: Support for restarting system calls for UniCore32 targets, (continued)
- [Qemu-devel] [PATCH v2 13/28] linux-user: Support for restarting system calls for UniCore32 targets, Peter Maydell, 2016/05/12
- [Qemu-devel] [PATCH v2 04/28] linux-user: Define TARGET_ERESTART* errno values, Peter Maydell, 2016/05/12
- [Qemu-devel] [PATCH v2 22/28] linux-user: Provide safe_syscall for fixing races between signals and syscalls, Peter Maydell, 2016/05/12
- [Qemu-devel] [PATCH v2 06/28] linux-user: Support for restarting system calls for x86 targets, Peter Maydell, 2016/05/12
- [Qemu-devel] [PATCH v2 02/28] linux-user: Consistently return host errnos from do_openat(), Peter Maydell, 2016/05/12
- [Qemu-devel] [PATCH v2 27/28] linux-user: Use safe_syscall for pselect, select syscalls, Peter Maydell, 2016/05/12
- [Qemu-devel] [PATCH v2 24/28] linux-user: Use safe_syscall for open and openat system calls, Peter Maydell, 2016/05/12
- [Qemu-devel] [PATCH v2 14/28] linux-user: Support for restarting system calls for OpenRISC targets, Peter Maydell, 2016/05/12
- [Qemu-devel] [PATCH v2 19/28] linux-user: Set r14 on exit from microblaze syscall, Peter Maydell, 2016/05/12
- [Qemu-devel] [PATCH v2 12/28] linux-user: Support for restarting system calls for Alpha targets,
Peter Maydell <=
- [Qemu-devel] [PATCH v2 23/28] linux-user: Use safe_syscall for read and write system calls, Peter Maydell, 2016/05/12
- [Qemu-devel] [PATCH v2 08/28] linux-user: Support for restarting system calls for MIPS targets, Peter Maydell, 2016/05/12
- [Qemu-devel] [PATCH v2 16/28] linux-user: Support for restarting system calls for S390 targets, Peter Maydell, 2016/05/12
- [Qemu-devel] [PATCH v2 03/28] linux-user: Reindent signal handling, Peter Maydell, 2016/05/12
- [Qemu-devel] [PATCH v2 10/28] linux-user: Support for restarting system calls for SPARC targets, Peter Maydell, 2016/05/12
- [Qemu-devel] [PATCH v2 26/28] linux-user: Use safe_syscall for execve syscall, Peter Maydell, 2016/05/12
- [Qemu-devel] [PATCH v2 28/28] linux-user: Use safe_syscall for futex syscall, Peter Maydell, 2016/05/12