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authorRichard Henderson <richard.henderson@linaro.org>2020-10-10 12:04:32 -0500
committerRichard Henderson <richard.henderson@linaro.org>2020-10-14 21:19:53 -0700
commit4fa3876ebb98889f076152f70b885234ff237ec1 (patch)
tree14a1587bc42a264faabef12463523ff776640cf8 /linux-user/microblaze
parent51f22c195b644d6ec0a175c2a3790495e1993d9d (diff)
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linux-user/microblaze: Implement rt signal frames
Allows microblaze to pass tests/tcg/multiarch/linux-test.c. Tested-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'linux-user/microblaze')
-rw-r--r--linux-user/microblaze/signal.c91
1 files changed, 82 insertions, 9 deletions
diff --git a/linux-user/microblaze/signal.c b/linux-user/microblaze/signal.c
index b4eeef4..3d316a2 100644
--- a/linux-user/microblaze/signal.c
+++ b/linux-user/microblaze/signal.c
@@ -35,9 +35,9 @@ struct target_stack_t {
struct target_ucontext {
abi_ulong tuc_flags;
abi_ulong tuc_link;
- struct target_stack_t tuc_stack;
+ target_stack_t tuc_stack;
struct target_sigcontext tuc_mcontext;
- uint32_t tuc_extramask[TARGET_NSIG_WORDS - 1];
+ target_sigset_t tuc_sigmask;
};
/* Signal frames. */
@@ -47,9 +47,9 @@ struct target_signal_frame {
uint32_t tramp[2];
};
-struct rt_signal_frame {
- siginfo_t info;
- ucontext_t uc;
+struct target_rt_sigframe {
+ target_siginfo_t info;
+ struct target_ucontext uc;
uint32_t tramp[2];
};
@@ -200,7 +200,55 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
target_siginfo_t *info,
target_sigset_t *set, CPUMBState *env)
{
- qemu_log_mask(LOG_UNIMP, "setup_rt_frame: not implemented\n");
+ struct target_rt_sigframe *frame;
+ abi_ulong frame_addr;
+
+ frame_addr = get_sigframe(ka, env, sizeof *frame);
+ trace_user_setup_rt_frame(env, frame_addr);
+
+ if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
+ force_sigsegv(sig);
+ return;
+ }
+
+ tswap_siginfo(&frame->info, info);
+
+ __put_user(0, &frame->uc.tuc_flags);
+ __put_user(0, &frame->uc.tuc_link);
+
+ target_save_altstack(&frame->uc.tuc_stack, env);
+ setup_sigcontext(&frame->uc.tuc_mcontext, env);
+
+ for (int i = 0; i < TARGET_NSIG_WORDS; i++) {
+ __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
+ }
+
+ /* Kernel does not use SA_RESTORER. */
+
+ /* addi r12, r0, __NR_sigreturn */
+ __put_user(0x31800000U | TARGET_NR_rt_sigreturn, frame->tramp + 0);
+ /* brki r14, 0x8 */
+ __put_user(0xb9cc0008U, frame->tramp + 1);
+
+ /*
+ * Return from sighandler will jump to the tramp.
+ * Negative 8 offset because return is rtsd r15, 8
+ */
+ env->regs[15] =
+ frame_addr + offsetof(struct target_rt_sigframe, tramp) - 8;
+
+ /* Set up registers for signal handler */
+ env->regs[1] = frame_addr;
+
+ /* Signal handler args: */
+ env->regs[5] = sig;
+ env->regs[6] = frame_addr + offsetof(struct target_rt_sigframe, info);
+ env->regs[7] = frame_addr + offsetof(struct target_rt_sigframe, uc);
+
+ /* Offset to handle microblaze rtid r14, 0 */
+ env->pc = (unsigned long)ka->_sa_handler;
+
+ unlock_user_struct(frame, frame_addr, 1);
}
long do_sigreturn(CPUMBState *env)
@@ -239,7 +287,32 @@ badframe:
long do_rt_sigreturn(CPUMBState *env)
{
- trace_user_do_rt_sigreturn(env, 0);
- qemu_log_mask(LOG_UNIMP, "do_rt_sigreturn: not implemented\n");
- return -TARGET_ENOSYS;
+ struct target_rt_sigframe *frame = NULL;
+ abi_ulong frame_addr = env->regs[1];
+ sigset_t set;
+
+ trace_user_do_rt_sigreturn(env, frame_addr);
+
+ if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
+ goto badframe;
+ }
+
+ target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
+ set_sigmask(&set);
+
+ restore_sigcontext(&frame->uc.tuc_mcontext, env);
+
+ if (do_sigaltstack(frame_addr +
+ offsetof(struct target_rt_sigframe, uc.tuc_stack),
+ 0, get_sp_from_cpustate(env)) == -EFAULT) {
+ goto badframe;
+ }
+
+ unlock_user_struct(frame, frame_addr, 0);
+ return -TARGET_QEMU_ESIGRETURN;
+
+ badframe:
+ unlock_user_struct(frame, frame_addr, 0);
+ force_sig(TARGET_SIGSEGV);
+ return -TARGET_QEMU_ESIGRETURN;
}