diff options
| author | Timothy E Baldwin <T.E.Baldwin99@members.leeds.ac.uk> | 2016-05-12 18:47:36 +0100 |
|---|---|---|
| committer | Riku Voipio <riku.voipio@linaro.org> | 2016-05-27 14:49:50 +0300 |
| commit | 338c858c946017cd3ec8c2be06d817e001d94bc3 (patch) | |
| tree | 7fd5c85bda977aeb2e73c016cc2843324928b5e8 /linux-user | |
| parent | ba41249678f8c1504bf07706ddb0eda0d36cccc2 (diff) | |
linux-user: Support for restarting system calls for Alpha targets
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.Baldwin99@members.leeds.ac.uk>
Message-id: 1441497448-32489-13-git-send-email-T.E.Baldwin99@members.leeds.ac.uk
Reviewed-by: Peter Maydell <peter.maydell@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.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Diffstat (limited to 'linux-user')
| -rw-r--r-- | linux-user/alpha/target_signal.h | 1 | ||||
| -rw-r--r-- | linux-user/main.c | 7 | ||||
| -rw-r--r-- | 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 d3822da60e..4c78319145 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 75552a050c..cc7f2aa3c3 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 8b5ddf2ad3..559e7640a5 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: |