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[Qemu-devel] [RFC 11/11] linux-user: Implement signal handling for mipsn
From: |
Andreas Färber |
Subject: |
[Qemu-devel] [RFC 11/11] linux-user: Implement signal handling for mipsn32 |
Date: |
Thu, 29 Dec 2011 16:55:49 +0100 |
Mostly adapted from o32.
Linux no longer seems to have sf_code/rs_code for any of the ABIs.
It's u32 {sf,rt}_pad[2] /* Was: signal trampoline */ now...
Signed-off-by: Andreas Färber <address@hidden>
Cc: Richard Henderson <address@hidden>
Cc: Khansa Butt <address@hidden>
---
linux-user/signal.c | 104 +++++++++++++++++++++++++++++++++++++++++++++++++--
1 files changed, 100 insertions(+), 4 deletions(-)
diff --git a/linux-user/signal.c b/linux-user/signal.c
index b33f8cb..82ce4ac 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -2673,7 +2673,20 @@ long do_rt_sigreturn(CPUState *env)
#elif defined(TARGET_ABI_MIPSN32)
-# warning signal handling not implemented
+struct target_ucontext {
+ uint32_t tuc_flags;
+ int32_t tuc_link;
+ target_stack_t tuc_stack;
+ struct target_sigcontext tuc_mcontext;
+ target_sigset_t tuc_sigmask;
+};
+
+struct target_rt_sigframe {
+ uint32_t rs_ass[4]; /* argument save space for o32 */
+ uint32_t rs_pad[2]; /* Was: signal trampoline */
+ struct target_siginfo rs_info;
+ struct target_ucontext rs_uc;
+};
static void setup_frame(int sig, struct target_sigaction *ka,
target_sigset_t *set, CPUState *env)
@@ -2685,7 +2698,61 @@ static void setup_rt_frame(int sig, struct
target_sigaction *ka,
target_siginfo_t *info,
target_sigset_t *set, CPUState *env)
{
- fprintf(stderr, "setup_rt_frame: not implemented\n");
+ struct target_rt_sigframe *frame;
+ abi_ulong frame_addr;
+ int i;
+
+ frame_addr = get_sigframe(ka, env, sizeof(*frame));
+ if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0))
+ goto give_sigsegv;
+
+ //install_sigtramp(frame->rs_pad, TARGET_NR_rt_sigreturn);
+
+ /* Create siginfo. */
+ copy_siginfo_to_user(&frame->rs_info, info);
+
+ /* Create the ucontext. */
+ __put_user(0, &frame->rs_uc.tuc_flags);
+ __put_user(0, &frame->rs_uc.tuc_link);
+ __put_user(target_sigaltstack_used.ss_sp, &frame->rs_uc.tuc_stack.ss_sp);
+ __put_user(target_sigaltstack_used.ss_size,
&frame->rs_uc.tuc_stack.ss_size);
+ __put_user(sas_ss_flags(get_sp_from_cpustate(env)),
+ &frame->rs_uc.tuc_stack.ss_flags);
+
+ setup_sigcontext(env, &frame->rs_uc.tuc_mcontext);
+
+ for(i = 0; i < TARGET_NSIG_WORDS; i++) {
+ __put_user(set->sig[i], &frame->rs_uc.tuc_sigmask.sig[i]);
+ }
+
+ /*
+ * Arguments to signal handler:
+ *
+ * a0 = signal number
+ * a1 = pointer to struct siginfo
+ * a2 = pointer to struct ucontext
+ *
+ * $25 and PC point to the signal handler, $29 points to the
+ * struct sigframe.
+ */
+ env->active_tc.gpr[ 4] = sig;
+ env->active_tc.gpr[ 5] = frame_addr
+ + offsetof(struct target_rt_sigframe, rs_info);
+ env->active_tc.gpr[ 6] = frame_addr
+ + offsetof(struct target_rt_sigframe, rs_uc);
+ env->active_tc.gpr[29] = frame_addr;
+ //env->active_tc.gpr[31] = frame_addr
+ // + offsetof(struct target_rt_sigframe, rs_pad);
+ /* The original kernel code sets CP0_EPC to the handler
+ * since it returns to userland using eret
+ * we cannot do this here, and we must set PC directly */
+ env->active_tc.PC = env->active_tc.gpr[25] = ka->_sa_handler;
+ unlock_user_struct(frame, frame_addr, 1);
+ return;
+
+give_sigsegv:
+ unlock_user_struct(frame, frame_addr, 1);
+ force_sig(TARGET_SIGSEGV/*, current*/);
}
long do_sigreturn(CPUState *env)
@@ -2696,8 +2763,37 @@ long do_sigreturn(CPUState *env)
long do_rt_sigreturn(CPUState *env)
{
- fprintf(stderr, "do_rt_sigreturn: not implemented\n");
- return -TARGET_ENOSYS;
+ struct target_rt_sigframe *frame;
+ abi_ulong frame_addr;
+ sigset_t blocked;
+
+#if defined(DEBUG_SIGNAL)
+ fprintf(stderr, "do_rt_sigreturn\n");
+#endif
+ frame_addr = env->active_tc.gpr[29];
+ if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1))
+ goto badframe;
+
+ target_to_host_sigset(&blocked, &frame->rs_uc.tuc_sigmask);
+ sigprocmask(SIG_SETMASK, &blocked, NULL);
+
+ if (restore_sigcontext(env, &frame->rs_uc.tuc_mcontext))
+ goto badframe;
+
+ if (do_sigaltstack(frame_addr +
+ offsetof(struct target_rt_sigframe, rs_uc.tuc_stack),
+ 0, get_sp_from_cpustate(env)) == -EFAULT)
+ goto badframe;
+
+ env->active_tc.PC = env->CP0_EPC;
+ /* I am not sure this is right, but it seems to work
+ * maybe a problem with nested signals ? */
+ env->CP0_EPC = 0;
+ return -TARGET_QEMU_ESIGRETURN;
+
+badframe:
+ force_sig(TARGET_SIGSEGV/*, current*/);
+ return 0;
}
#elif defined(TARGET_ABI_MIPSO32)
--
1.7.7
- [Qemu-devel] [RFC 00/11] linux-user: Sort out signal handling for MIPS n32 and n64, Andreas Färber, 2011/12/29
- [Qemu-devel] [PATCH 01/11] linux-user: Add default-configs for mipsn32[el], Andreas Färber, 2011/12/29
- [Qemu-devel] [RFC 06/11] linux-user: Unify signal handling for mips, Andreas Färber, 2011/12/29
- [Qemu-devel] [PATCH 04/11] linux-user: Define TARGET_QEMU_ESIGRETURN for mips64, Andreas Färber, 2011/12/29
- [Qemu-devel] [RFC 11/11] linux-user: Implement signal handling for mipsn32,
Andreas Färber <=
- [Qemu-devel] [PATCH 05/11] linux-user: Fix sa_flags byte swaps for mips, Andreas Färber, 2011/12/29
- [Qemu-devel] [PATCH 10/11] linux-user: mipsn32 does not support non-RT signals, Andreas Färber, 2011/12/29
- [Qemu-devel] [RFC 07/11] linux-user: target_sigcontext for mipsn32 and mips64, Andreas Färber, 2011/12/29
- [Qemu-devel] [PATCH 03/11] linux-user: Define TARGET_QEMU_ESIGRETURN for mipsn32, Andreas Färber, 2011/12/29
- [Qemu-devel] [RFC 08/11] linux-user: Share {setup, restore}_sigcontext() for mips ABIs, Andreas Färber, 2011/12/29
- [Qemu-devel] [PATCH 02/11] linux-user: Add default configs for mips64[el], Andreas Färber, 2011/12/29
- [Qemu-devel] [RFC 09/11] linux-user: Setup/restore sc_acx for mips and mipsn32, Andreas Färber, 2011/12/29