diff options
Diffstat (limited to 'arch/s390/kernel/signal.c')
| -rw-r--r-- | arch/s390/kernel/signal.c | 107 |
1 files changed, 53 insertions, 54 deletions
diff --git a/arch/s390/kernel/signal.c b/arch/s390/kernel/signal.c index 9a40e1cc5ec3..e751cab80e04 100644 --- a/arch/s390/kernel/signal.c +++ b/arch/s390/kernel/signal.c @@ -30,6 +30,7 @@ #include <asm/ucontext.h> #include <asm/uaccess.h> #include <asm/lowcore.h> +#include <asm/compat.h> #include "entry.h" #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) @@ -156,7 +157,7 @@ static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs) current->thread.fp_regs.fpc &= FPC_VALID_MASK; restore_fp_regs(¤t->thread.fp_regs); - regs->svcnr = 0; /* disable syscall checks */ + regs->svc_code = 0; /* disable syscall checks */ return 0; } @@ -401,7 +402,6 @@ static int handle_signal(unsigned long sig, struct k_sigaction *ka, */ void do_signal(struct pt_regs *regs) { - unsigned long retval = 0, continue_addr = 0, restart_addr = 0; siginfo_t info; int signr; struct k_sigaction ka; @@ -421,54 +421,43 @@ void do_signal(struct pt_regs *regs) else oldset = ¤t->blocked; - /* Are we from a system call? */ - if (regs->svcnr) { - continue_addr = regs->psw.addr; - restart_addr = continue_addr - regs->ilc; - retval = regs->gprs[2]; - - /* Prepare for system call restart. We do this here so that a - debugger will see the already changed PSW. */ - switch (retval) { - case -ERESTARTNOHAND: - case -ERESTARTSYS: - case -ERESTARTNOINTR: - regs->gprs[2] = regs->orig_gpr2; - regs->psw.addr = restart_addr; - break; - case -ERESTART_RESTARTBLOCK: - regs->gprs[2] = -EINTR; - } - regs->svcnr = 0; /* Don't deal with this again. */ - } - - /* Get signal to deliver. When running under ptrace, at this point - the debugger may change all our registers ... */ + /* + * Get signal to deliver. When running under ptrace, at this point + * the debugger may change all our registers, including the system + * call information. + */ + current_thread_info()->system_call = regs->svc_code; signr = get_signal_to_deliver(&info, &ka, regs, NULL); - - /* Depending on the signal settings we may need to revert the - decision to restart the system call. */ - if (signr > 0 && regs->psw.addr == restart_addr) { - if (retval == -ERESTARTNOHAND - || (retval == -ERESTARTSYS - && !(current->sighand->action[signr-1].sa.sa_flags - & SA_RESTART))) { - regs->gprs[2] = -EINTR; - regs->psw.addr = continue_addr; - } - } + regs->svc_code = current_thread_info()->system_call; if (signr > 0) { /* Whee! Actually deliver the signal. */ - int ret; -#ifdef CONFIG_COMPAT - if (is_compat_task()) { - ret = handle_signal32(signr, &ka, &info, oldset, regs); - } - else -#endif - ret = handle_signal(signr, &ka, &info, oldset, regs); - if (!ret) { + if (regs->svc_code > 0) { + /* Check for system call restarting. */ + switch (regs->gprs[2]) { + case -ERESTART_RESTARTBLOCK: + case -ERESTARTNOHAND: + regs->gprs[2] = -EINTR; + break; + case -ERESTARTSYS: + if (!(ka.sa.sa_flags & SA_RESTART)) { + regs->gprs[2] = -EINTR; + break; + } + /* fallthrough */ + case -ERESTARTNOINTR: + regs->gprs[2] = regs->orig_gpr2; + regs->psw.addr = regs->psw.addr - + (regs->svc_code >> 16); + break; + } + /* No longer in a system call */ + regs->svc_code = 0; + } + + if ((is_compat_task() ? + handle_signal32(signr, &ka, &info, oldset, regs) : + handle_signal(signr, &ka, &info, oldset, regs)) == 0) { /* * A signal was successfully delivered; the saved * sigmask will have been stored in the signal frame, @@ -482,11 +471,28 @@ void do_signal(struct pt_regs *regs) * Let tracing know that we've done the handler setup. */ tracehook_signal_handler(signr, &info, &ka, regs, - test_thread_flag(TIF_SINGLE_STEP)); + test_thread_flag(TIF_SINGLE_STEP)); } return; } + /* No handlers present - check for system call restart */ + if (regs->svc_code > 0) { + switch (regs->gprs[2]) { + case -ERESTART_RESTARTBLOCK: + /* Restart with sys_restart_syscall */ + regs->svc_code = __NR_restart_syscall; + /* fallthrough */ + case -ERESTARTNOHAND: + case -ERESTARTSYS: + case -ERESTARTNOINTR: + /* Restart system call with magic TIF bit. */ + regs->gprs[2] = regs->orig_gpr2; + set_thread_flag(TIF_RESTART_SVC); + break; + } + } + /* * If there's no signal to deliver, we just put the saved sigmask back. */ @@ -494,13 +500,6 @@ void do_signal(struct pt_regs *regs) clear_thread_flag(TIF_RESTORE_SIGMASK); sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); } - - /* Restart a different system call. */ - if (retval == -ERESTART_RESTARTBLOCK - && regs->psw.addr == continue_addr) { - regs->gprs[2] = __NR_restart_syscall; - set_thread_flag(TIF_RESTART_SVC); - } } void do_notify_resume(struct pt_regs *regs) |