linux-user: Use target_restore_altstack in all sigreturn
Note that target_restore_altstack uses the host memory
pointer that we have already verified, so TARGET_EFAULT
is not a possible return value.
Note that using -EFAULT was a bug.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210426025334.1168495-3-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
diff --git a/linux-user/aarch64/signal.c b/linux-user/aarch64/signal.c
index b591790..2a1b7db 100644
--- a/linux-user/aarch64/signal.c
+++ b/linux-user/aarch64/signal.c
@@ -561,11 +561,7 @@
goto badframe;
}
- if (do_sigaltstack(frame_addr +
- offsetof(struct target_rt_sigframe, uc.tuc_stack),
- 0, get_sp_from_cpustate(env)) == -EFAULT) {
- goto badframe;
- }
+ target_restore_altstack(&frame->uc.tuc_stack, get_sp_from_cpustate(env));
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/alpha/signal.c b/linux-user/alpha/signal.c
index c5c27ce..0af0227 100644
--- a/linux-user/alpha/signal.c
+++ b/linux-user/alpha/signal.c
@@ -257,11 +257,7 @@
set_sigmask(&set);
restore_sigcontext(env, &frame->uc.tuc_mcontext);
- if (do_sigaltstack(frame_addr + offsetof(struct target_rt_sigframe,
- uc.tuc_stack),
- 0, env->ir[IR_SP]) == -EFAULT) {
- goto badframe;
- }
+ target_restore_altstack(&frame->uc.tuc_stack, env->ir[IR_SP]);
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/arm/signal.c b/linux-user/arm/signal.c
index f21d153..b7a7723 100644
--- a/linux-user/arm/signal.c
+++ b/linux-user/arm/signal.c
@@ -685,11 +685,7 @@
}
}
- if (do_sigaltstack(context_addr
- + offsetof(struct target_ucontext_v2, tuc_stack),
- 0, get_sp_from_cpustate(env)) == -EFAULT) {
- return 1;
- }
+ target_restore_altstack(&uc->tuc_stack, get_sp_from_cpustate(env));
#if 0
/* Send SIGTRAP if we're single-stepping */
@@ -773,8 +769,7 @@
goto badframe;
}
- if (do_sigaltstack(frame_addr + offsetof(struct rt_sigframe_v1, uc.tuc_stack), 0, get_sp_from_cpustate(env)) == -EFAULT)
- goto badframe;
+ target_restore_altstack(&frame->uc.tuc_stack, get_sp_from_cpustate(env));
#if 0
/* Send SIGTRAP if we're single-stepping */
diff --git a/linux-user/hexagon/signal.c b/linux-user/hexagon/signal.c
index fde8dc9..3854eb4 100644
--- a/linux-user/hexagon/signal.c
+++ b/linux-user/hexagon/signal.c
@@ -260,11 +260,7 @@
}
restore_ucontext(env, &frame->uc);
-
- if (do_sigaltstack(frame_addr + offsetof(struct target_rt_sigframe,
- uc.uc_stack), 0, get_sp_from_cpustate(env)) == -EFAULT) {
- goto badframe;
- }
+ target_restore_altstack(&frame->uc.uc_stack, get_sp_from_cpustate(env));
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/hppa/signal.c b/linux-user/hppa/signal.c
index d1a58fe..578874c 100644
--- a/linux-user/hppa/signal.c
+++ b/linux-user/hppa/signal.c
@@ -187,13 +187,7 @@
set_sigmask(&set);
restore_sigcontext(env, &frame->uc.tuc_mcontext);
- unlock_user_struct(frame, frame_addr, 0);
-
- if (do_sigaltstack(frame_addr + offsetof(struct target_rt_sigframe,
- uc.tuc_stack),
- 0, env->gr[30]) == -EFAULT) {
- goto badframe;
- }
+ target_restore_altstack(&frame->uc.tuc_stack, env->gr[30]);
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/i386/signal.c b/linux-user/i386/signal.c
index 9320e1d..3a0a154 100644
--- a/linux-user/i386/signal.c
+++ b/linux-user/i386/signal.c
@@ -581,10 +581,7 @@
goto badframe;
}
- if (do_sigaltstack(frame_addr + offsetof(struct rt_sigframe, uc.tuc_stack), 0,
- get_sp_from_cpustate(env)) == -EFAULT) {
- goto badframe;
- }
+ target_restore_altstack(&frame->uc.tuc_stack, get_sp_from_cpustate(env));
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/m68k/signal.c b/linux-user/m68k/signal.c
index 49ff87c..004b59f 100644
--- a/linux-user/m68k/signal.c
+++ b/linux-user/m68k/signal.c
@@ -400,10 +400,7 @@
if (target_rt_restore_ucontext(env, &frame->uc))
goto badframe;
- if (do_sigaltstack(frame_addr +
- offsetof(struct target_rt_sigframe, uc.tuc_stack),
- 0, get_sp_from_cpustate(env)) == -EFAULT)
- goto badframe;
+ target_restore_altstack(&frame->uc.tuc_stack, get_sp_from_cpustate(env));
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/microblaze/signal.c b/linux-user/microblaze/signal.c
index cf0707b..f59a1fa 100644
--- a/linux-user/microblaze/signal.c
+++ b/linux-user/microblaze/signal.c
@@ -209,11 +209,7 @@
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;
- }
+ target_restore_altstack(&frame->uc.tuc_stack, get_sp_from_cpustate(env));
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/mips/signal.c b/linux-user/mips/signal.c
index 455a8a2..456fa64 100644
--- a/linux-user/mips/signal.c
+++ b/linux-user/mips/signal.c
@@ -368,11 +368,7 @@
set_sigmask(&blocked);
restore_sigcontext(env, &frame->rs_uc.tuc_mcontext);
-
- if (do_sigaltstack(frame_addr +
- offsetof(struct target_rt_sigframe, rs_uc.tuc_stack),
- 0, get_sp_from_cpustate(env)) == -EFAULT)
- goto badframe;
+ target_restore_altstack(&frame->rs_uc.tuc_stack, get_sp_from_cpustate(env));
env->active_tc.PC = env->CP0_EPC;
mips_set_hflags_isa_mode_from_pc(env);
diff --git a/linux-user/nios2/signal.c b/linux-user/nios2/signal.c
index 7d53506..751ea88 100644
--- a/linux-user/nios2/signal.c
+++ b/linux-user/nios2/signal.c
@@ -82,9 +82,7 @@
int *pr2)
{
int temp;
- abi_ulong off, frame_addr = env->regs[R_SP];
unsigned long *gregs = uc->tuc_mcontext.gregs;
- int err;
/* Always make any pending restarted system calls return -EINTR */
/* current->restart_block.fn = do_no_restart_syscall; */
@@ -130,11 +128,7 @@
__get_user(env->regs[R_RA], &gregs[23]);
__get_user(env->regs[R_SP], &gregs[28]);
- off = offsetof(struct target_rt_sigframe, uc.tuc_stack);
- err = do_sigaltstack(frame_addr + off, 0, get_sp_from_cpustate(env));
- if (err == -EFAULT) {
- return 1;
- }
+ target_restore_altstack(&uc->tuc_stack, get_sp_from_cpustate(env));
*pr2 = env->regs[2];
return 0;
diff --git a/linux-user/openrisc/signal.c b/linux-user/openrisc/signal.c
index 232ad82..86f94d7 100644
--- a/linux-user/openrisc/signal.c
+++ b/linux-user/openrisc/signal.c
@@ -158,10 +158,7 @@
set_sigmask(&set);
restore_sigcontext(env, &frame->uc.tuc_mcontext);
- if (do_sigaltstack(frame_addr + offsetof(target_rt_sigframe, uc.tuc_stack),
- 0, frame_addr) == -EFAULT) {
- goto badframe;
- }
+ target_restore_altstack(&frame->uc.tuc_stack, frame_addr);
unlock_user_struct(frame, frame_addr, 0);
return cpu_get_gpr(env, 11);
diff --git a/linux-user/ppc/signal.c b/linux-user/ppc/signal.c
index bad38f8..b44d5ce 100644
--- a/linux-user/ppc/signal.c
+++ b/linux-user/ppc/signal.c
@@ -655,9 +655,7 @@
if (do_setcontext(&rt_sf->uc, env, 1))
goto sigsegv;
- do_sigaltstack(rt_sf_addr
- + offsetof(struct target_rt_sigframe, uc.tuc_stack),
- 0, env->gpr[1]);
+ target_restore_altstack(&rt_sf->uc.tuc_stack, env->gpr[1]);
unlock_user_struct(rt_sf, rt_sf_addr, 1);
return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/riscv/signal.c b/linux-user/riscv/signal.c
index 67a95db..81d1129 100644
--- a/linux-user/riscv/signal.c
+++ b/linux-user/riscv/signal.c
@@ -192,11 +192,7 @@
}
restore_ucontext(env, &frame->uc);
-
- if (do_sigaltstack(frame_addr + offsetof(struct target_rt_sigframe,
- uc.uc_stack), 0, get_sp_from_cpustate(env)) == -EFAULT) {
- goto badframe;
- }
+ target_restore_altstack(&frame->uc.uc_stack, get_sp_from_cpustate(env));
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/s390x/signal.c b/linux-user/s390x/signal.c
index 7107c5f..73806f5 100644
--- a/linux-user/s390x/signal.c
+++ b/linux-user/s390x/signal.c
@@ -307,10 +307,8 @@
goto badframe;
}
- if (do_sigaltstack(frame_addr + offsetof(rt_sigframe, uc.tuc_stack), 0,
- get_sp_from_cpustate(env)) == -EFAULT) {
- goto badframe;
- }
+ target_restore_altstack(&frame->uc.tuc_stack, get_sp_from_cpustate(env));
+
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/sh4/signal.c b/linux-user/sh4/signal.c
index 29c1ee3..684f18d 100644
--- a/linux-user/sh4/signal.c
+++ b/linux-user/sh4/signal.c
@@ -323,12 +323,7 @@
set_sigmask(&blocked);
restore_sigcontext(regs, &frame->uc.tuc_mcontext);
-
- if (do_sigaltstack(frame_addr +
- offsetof(struct target_rt_sigframe, uc.tuc_stack),
- 0, get_sp_from_cpustate(regs)) == -EFAULT) {
- goto badframe;
- }
+ target_restore_altstack(&frame->uc.tuc_stack, get_sp_from_cpustate(regs));
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/xtensa/signal.c b/linux-user/xtensa/signal.c
index 590f031..22ec6cd 100644
--- a/linux-user/xtensa/signal.c
+++ b/linux-user/xtensa/signal.c
@@ -253,12 +253,8 @@
set_sigmask(&set);
restore_sigcontext(env, frame);
+ target_restore_altstack(&frame->uc.tuc_stack, get_sp_from_cpustate(env));
- if (do_sigaltstack(frame_addr +
- offsetof(struct target_rt_sigframe, uc.tuc_stack),
- 0, get_sp_from_cpustate(env)) == -TARGET_EFAULT) {
- goto badframe;
- }
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
