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linux-user/s390x: Implement setup_sigtramp

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Create and record the two signal trampolines.
Use them when the guest does not use SA_RESTORER.

Cc: qemu-s390x@nongnu.org
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210929130553.121567-22-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2021-09-29 09:05:48 -04:00 committed by Laurent Vivier
parent 3c62b5d201
commit 31330e6cec
2 changed files with 18 additions and 8 deletions
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24
linux-user/s390x/signal.c
View File

@ -68,7 +68,6 @@ typedef struct {
target_sigregs sregs;
int signo;
target_sigregs_ext sregs_ext;
uint16_t retcode;
} sigframe;
#define TARGET_UC_VXRS 2
@ -85,7 +84,6 @@ struct target_ucontext {
typedef struct {
uint8_t callee_used_stack[__SIGNAL_FRAMESIZE];
uint16_t retcode;
struct target_siginfo info;
struct target_ucontext uc;
} rt_sigframe;
@ -209,9 +207,7 @@ void setup_frame(int sig, struct target_sigaction *ka,
if (ka->sa_flags & TARGET_SA_RESTORER) {
restorer = ka->sa_restorer;
} else {
restorer = frame_addr + offsetof(sigframe, retcode);
__put_user(S390_SYSCALL_OPCODE | TARGET_NR_sigreturn,
&frame->retcode);
restorer = default_sigreturn;
}
/* Set up registers for signal handler */
@ -262,9 +258,7 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
if (ka->sa_flags & TARGET_SA_RESTORER) {
restorer = ka->sa_restorer;
} else {
restorer = frame_addr + offsetof(typeof(*frame), retcode);
__put_user(S390_SYSCALL_OPCODE | TARGET_NR_rt_sigreturn,
&frame->retcode);
restorer = default_rt_sigreturn;
}
/* Create siginfo on the signal stack. */
@ -405,3 +399,17 @@ long do_rt_sigreturn(CPUS390XState *env)
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
}
void setup_sigtramp(abi_ulong sigtramp_page)
{
uint16_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 2 + 2, 0);
assert(tramp != NULL);
default_sigreturn = sigtramp_page;
__put_user(S390_SYSCALL_OPCODE | TARGET_NR_sigreturn, &tramp[0]);
default_rt_sigreturn = sigtramp_page + 2;
__put_user(S390_SYSCALL_OPCODE | TARGET_NR_rt_sigreturn, &tramp[1]);
unlock_user(tramp, sigtramp_page, 2 + 2);
}

2
linux-user/s390x/target_signal.h
View File

@ -19,4 +19,6 @@ typedef struct target_sigaltstack {
#include "../generic/signal.h"
#define TARGET_ARCH_HAS_SETUP_FRAME
#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 1
#endif /* S390X_TARGET_SIGNAL_H */