From 4ca159f725e46462fbad64c928437a6651f6405b Mon Sep 17 00:00:00 2001 From: Matt Fleming Date: Tue, 14 Feb 2012 11:40:54 +0000 Subject: OpenRISC: Don't reimplement force_sigsegv() Instead of open coding the sequence from force_sigsegv() just call it. This also fixes a bug because we were modifying ka->sa.sa_handler (which is a copy of sighand->action[]), whereas the intention of the code was to modify sighand->action[] directly. As the original code was working with a copy it had no effect on signal delivery. Acked-by: Oleg Nesterov Cc: Jonas Bonn Cc: Arnd Bergmann Cc: linux@lists.openrisc.net Signed-off-by: Matt Fleming Signed-off-by: Jonas Bonn --- arch/openrisc/kernel/signal.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) (limited to 'arch/openrisc/kernel/signal.c') diff --git a/arch/openrisc/kernel/signal.c b/arch/openrisc/kernel/signal.c index 95207ab0c99..53741ba0210 100644 --- a/arch/openrisc/kernel/signal.c +++ b/arch/openrisc/kernel/signal.c @@ -250,9 +250,7 @@ static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, return; give_sigsegv: - if (sig == SIGSEGV) - ka->sa.sa_handler = SIG_DFL; - force_sig(SIGSEGV, current); + force_sigsegv(sig, current); } static inline void -- cgit v1.2.3-70-g09d2 From b675eeb743abaa0b99a35c1fd32fea8e13a17d32 Mon Sep 17 00:00:00 2001 From: Matt Fleming Date: Tue, 14 Feb 2012 11:40:55 +0000 Subject: OpenRISC: No need to reset handler if SA_ONESHOT get_signal_to_deliver() already resets the signal handler if SA_ONESHOT is set in ka->sa.sa_flags, there's no need to do it again in handle_signal(). Furthermore, because we were modifying ka->sa.sa_handler (which is a copy of sighand->action[]) instead of sighand->action[] the original code actually had no effect on signal delivery. Acked-by: Oleg Nesterov Cc: Jonas Bonn Cc: Arnd Bergmann Cc: linux@lists.openrisc.net Signed-off-by: Matt Fleming Signed-off-by: Jonas Bonn --- arch/openrisc/kernel/signal.c | 3 --- 1 file changed, 3 deletions(-) (limited to 'arch/openrisc/kernel/signal.c') diff --git a/arch/openrisc/kernel/signal.c b/arch/openrisc/kernel/signal.c index 53741ba0210..92d2218fcb9 100644 --- a/arch/openrisc/kernel/signal.c +++ b/arch/openrisc/kernel/signal.c @@ -260,9 +260,6 @@ handle_signal(unsigned long sig, { setup_rt_frame(sig, ka, info, oldset, regs); - if (ka->sa.sa_flags & SA_ONESHOT) - ka->sa.sa_handler = SIG_DFL; - spin_lock_irq(¤t->sighand->siglock); sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask); if (!(ka->sa.sa_flags & SA_NODEFER)) -- cgit v1.2.3-70-g09d2 From e933c70de0e2590d41f5edd3133e7ee12b4e0bc6 Mon Sep 17 00:00:00 2001 From: Matt Fleming Date: Tue, 14 Feb 2012 11:40:56 +0000 Subject: OpenRISC: Don't mask signals if we fail to setup signal stack setup_rt_frame() needs to return an indication of whether it succeeded or failed in setting up the signal stack frame. If setup_rt_frame() fails then we must not modify current->blocked. Acked-by: Oleg Nesterov Cc: Jonas Bonn Cc: Arnd Bergmann Cc: linux@lists.openrisc.net Signed-off-by: Matt Fleming Signed-off-by: Jonas Bonn --- arch/openrisc/kernel/signal.c | 29 ++++++++++++++++++----------- 1 file changed, 18 insertions(+), 11 deletions(-) (limited to 'arch/openrisc/kernel/signal.c') diff --git a/arch/openrisc/kernel/signal.c b/arch/openrisc/kernel/signal.c index 92d2218fcb9..14764e827a6 100644 --- a/arch/openrisc/kernel/signal.c +++ b/arch/openrisc/kernel/signal.c @@ -189,8 +189,8 @@ static inline void __user *get_sigframe(struct k_sigaction *ka, * trampoline which performs the syscall sigreturn, or a provided * user-mode trampoline. */ -static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, - sigset_t *set, struct pt_regs *regs) +static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, + sigset_t *set, struct pt_regs *regs) { struct rt_sigframe *frame; unsigned long return_ip; @@ -247,18 +247,23 @@ static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, /* actually move the usp to reflect the stacked frame */ regs->sp = (unsigned long)frame; - return; + return 0; give_sigsegv: force_sigsegv(sig, current); + return -EFAULT; } -static inline void +static inline int handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs) { - setup_rt_frame(sig, ka, info, oldset, regs); + int ret; + + ret = setup_rt_frame(sig, ka, info, oldset, regs); + if (ret) + return ret; spin_lock_irq(¤t->sighand->siglock); sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask); @@ -267,6 +272,8 @@ handle_signal(unsigned long sig, recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); + + return 0; } /* @@ -355,13 +362,13 @@ void do_signal(struct pt_regs *regs) oldset = ¤t->blocked; /* Whee! Actually deliver the signal. */ - handle_signal(signr, &info, &ka, oldset, regs); - /* a signal was successfully delivered; the saved - * sigmask will have been stored in the signal frame, - * and will be restored by sigreturn, so we can simply - * clear the TIF_RESTORE_SIGMASK flag */ - if (test_thread_flag(TIF_RESTORE_SIGMASK)) + if (!handle_signal(signr, &info, &ka, oldset, regs)) { + /* a signal was successfully delivered; the saved + * sigmask will have been stored in the signal frame, + * and will be restored by sigreturn, so we can simply + * clear the TIF_RESTORE_SIGMASK flag */ clear_thread_flag(TIF_RESTORE_SIGMASK); + } tracehook_signal_handler(signr, &info, &ka, regs, test_thread_flag(TIF_SINGLESTEP)); -- cgit v1.2.3-70-g09d2 From d8d4b20df48287a7e9e37f706c410b13bc0438cf Mon Sep 17 00:00:00 2001 From: Matt Fleming Date: Tue, 14 Feb 2012 11:40:57 +0000 Subject: OpenRISC: Use set_current_blocked() and block_sigmask() As described in e6fa16ab ("signal: sigprocmask() should do retarget_shared_pending()") the modification of current->blocked is incorrect as we need to check whether the signal we're about to block is pending in the shared queue. Also, use the new helper function introduced in commit 5e6292c0f28f ("signal: add block_sigmask() for adding sigmask to current->blocked") which centralises the code for updating current->blocked after successfully delivering a signal and reduces the amount of duplicate code across architectures. In the past some architectures got this code wrong, so using this helper function should stop that from happening again. Cc: Oleg Nesterov Cc: Jonas Bonn Cc: Arnd Bergmann Cc: linux@lists.openrisc.net Signed-off-by: Matt Fleming Signed-off-by: Jonas Bonn --- arch/openrisc/kernel/signal.c | 13 ++----------- 1 file changed, 2 insertions(+), 11 deletions(-) (limited to 'arch/openrisc/kernel/signal.c') diff --git a/arch/openrisc/kernel/signal.c b/arch/openrisc/kernel/signal.c index 14764e827a6..cf35ea032a7 100644 --- a/arch/openrisc/kernel/signal.c +++ b/arch/openrisc/kernel/signal.c @@ -102,10 +102,7 @@ asmlinkage long _sys_rt_sigreturn(struct pt_regs *regs) goto badframe; sigdelsetmask(&set, ~_BLOCKABLE); - spin_lock_irq(¤t->sighand->siglock); - current->blocked = set; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); + set_current_blocked(&set); if (restore_sigcontext(regs, &frame->uc.uc_mcontext)) goto badframe; @@ -265,13 +262,7 @@ handle_signal(unsigned long sig, if (ret) return ret; - spin_lock_irq(¤t->sighand->siglock); - sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask); - if (!(ka->sa.sa_flags & SA_NODEFER)) - sigaddset(¤t->blocked, sig); - recalc_sigpending(); - - spin_unlock_irq(¤t->sighand->siglock); + block_sigmask(ka, sig); return 0; } -- cgit v1.2.3-70-g09d2 From 6cbe5e95267449ea0b79c0b049342409949da3ac Mon Sep 17 00:00:00 2001 From: Jonas Bonn Date: Fri, 2 Mar 2012 10:05:24 +0100 Subject: openrisc: sanitize use of orig_gpr11 The pt_regs struct had both a 'syscallno' field and an 'orig_gpr11' field and it wasn't really clear how these were supposed to be used. This patch removes the syscallno field altogether and makes orig_gpr11 work more like other architectures: keep track of syscall number in progress or hold -1 for non-syscall exceptions. Signed-off-by: Jonas Bonn --- arch/openrisc/include/asm/ptrace.h | 6 +++++- arch/openrisc/include/asm/syscall.h | 7 ++----- arch/openrisc/kernel/entry.S | 16 ++++++++-------- arch/openrisc/kernel/ptrace.c | 4 ++-- arch/openrisc/kernel/signal.c | 2 +- arch/openrisc/kernel/traps.c | 8 ++++---- 6 files changed, 22 insertions(+), 21 deletions(-) (limited to 'arch/openrisc/kernel/signal.c') diff --git a/arch/openrisc/include/asm/ptrace.h b/arch/openrisc/include/asm/ptrace.h index e612ce4512c..4651a737591 100644 --- a/arch/openrisc/include/asm/ptrace.h +++ b/arch/openrisc/include/asm/ptrace.h @@ -73,9 +73,13 @@ struct pt_regs { }; }; long pc; + /* For restarting system calls: + * Set to syscall number for syscall exceptions, + * -1 for all other exceptions. + */ long orig_gpr11; /* For restarting system calls */ - long syscallno; /* Syscall number (used by strace) */ long dummy; /* Cheap alignment fix */ + long dummy2; /* Cheap alignment fix */ }; /* TODO: Rename this to REDZONE because that's what it is */ diff --git a/arch/openrisc/include/asm/syscall.h b/arch/openrisc/include/asm/syscall.h index 9f0337055d2..b752bb67891 100644 --- a/arch/openrisc/include/asm/syscall.h +++ b/arch/openrisc/include/asm/syscall.h @@ -25,7 +25,7 @@ static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs) { - return regs->syscallno ? regs->syscallno : -1; + return regs->orig_gpr11; } static inline void @@ -50,10 +50,7 @@ static inline void syscall_set_return_value(struct task_struct *task, struct pt_regs *regs, int error, long val) { - if (error) - regs->gpr[11] = -error; - else - regs->gpr[11] = val; + regs->gpr[11] = (long) error ?: val; } static inline void diff --git a/arch/openrisc/kernel/entry.S b/arch/openrisc/kernel/entry.S index d5f9c35a583..6e61af8682b 100644 --- a/arch/openrisc/kernel/entry.S +++ b/arch/openrisc/kernel/entry.S @@ -95,7 +95,6 @@ handler: ;\ /* r1, EPCR, ESR a already saved */ ;\ l.sw PT_GPR2(r1),r2 ;\ l.sw PT_GPR3(r1),r3 ;\ - l.sw PT_ORIG_GPR11(r1),r11 ;\ /* r4 already save */ ;\ l.sw PT_GPR5(r1),r5 ;\ l.sw PT_GPR6(r1),r6 ;\ @@ -125,7 +124,9 @@ handler: ;\ /* r30 already save */ ;\ /* l.sw PT_GPR30(r1),r30*/ ;\ l.sw PT_GPR31(r1),r31 ;\ - l.sw PT_SYSCALLNO(r1),r0 + /* Store -1 in orig_gpr11 for non-syscall exceptions */ ;\ + l.addi r30,r0,-1 ;\ + l.sw PT_ORIG_GPR11(r1),r30 #define UNHANDLED_EXCEPTION(handler,vector) \ .global handler ;\ @@ -133,7 +134,6 @@ handler: ;\ /* r1, EPCR, ESR already saved */ ;\ l.sw PT_GPR2(r1),r2 ;\ l.sw PT_GPR3(r1),r3 ;\ - l.sw PT_ORIG_GPR11(r1),r11 ;\ l.sw PT_GPR5(r1),r5 ;\ l.sw PT_GPR6(r1),r6 ;\ l.sw PT_GPR7(r1),r7 ;\ @@ -162,7 +162,9 @@ handler: ;\ /* r31 already saved */ ;\ l.sw PT_GPR30(r1),r30 ;\ /* l.sw PT_GPR31(r1),r31 */ ;\ - l.sw PT_SYSCALLNO(r1),r0 ;\ + /* Store -1 in orig_gpr11 for non-syscall exceptions */ ;\ + l.addi r30,r0,-1 ;\ + l.sw PT_ORIG_GPR11(r1),r30 ;\ l.addi r3,r1,0 ;\ /* r4 is exception EA */ ;\ l.addi r5,r0,vector ;\ @@ -554,6 +556,7 @@ ENTRY(_sys_call_handler) l.sw PT_GPR9(r1),r9 /* r10 already saved */ l.sw PT_GPR11(r1),r11 + /* orig_gpr11 must be set for syscalls */ l.sw PT_ORIG_GPR11(r1),r11 /* r12,r13 already saved */ @@ -567,9 +570,6 @@ ENTRY(_sys_call_handler) /* r30 is the only register we clobber in the fast path */ /* r30 already saved */ /* l.sw PT_GPR30(r1),r30 */ - /* This is used by do_signal to determine whether to check for - * syscall restart or not */ - l.sw PT_SYSCALLNO(r1),r11 _syscall_check_trace_enter: /* If TIF_SYSCALL_TRACE is set, then we want to do syscall tracing */ @@ -731,7 +731,7 @@ _syscall_trace_enter: * so that we can do the syscall for real and return to the syscall * hot path. */ - l.lwz r11,PT_SYSCALLNO(r1) + l.lwz r11,PT_GPR11(r1) l.lwz r3,PT_GPR3(r1) l.lwz r4,PT_GPR4(r1) l.lwz r5,PT_GPR5(r1) diff --git a/arch/openrisc/kernel/ptrace.c b/arch/openrisc/kernel/ptrace.c index 7259047d5f9..6deacb6b95a 100644 --- a/arch/openrisc/kernel/ptrace.c +++ b/arch/openrisc/kernel/ptrace.c @@ -188,11 +188,11 @@ asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) */ ret = -1L; - audit_syscall_entry(audit_arch(), regs->syscallno, + audit_syscall_entry(audit_arch(), regs->gpr[11], regs->gpr[3], regs->gpr[4], regs->gpr[5], regs->gpr[6]); - return ret ? : regs->syscallno; + return ret ? : regs->gpr[11]; } asmlinkage void do_syscall_trace_leave(struct pt_regs *regs) diff --git a/arch/openrisc/kernel/signal.c b/arch/openrisc/kernel/signal.c index cf35ea032a7..e970743251a 100644 --- a/arch/openrisc/kernel/signal.c +++ b/arch/openrisc/kernel/signal.c @@ -305,7 +305,7 @@ void do_signal(struct pt_regs *regs) * below mean that the syscall executed to completion and no * restart is necessary. */ - if (regs->syscallno) { + if (regs->orig_gpr11) { int restart = 0; switch (regs->gpr[11]) { diff --git a/arch/openrisc/kernel/traps.c b/arch/openrisc/kernel/traps.c index ab68ffc8575..a2ee12948f4 100644 --- a/arch/openrisc/kernel/traps.c +++ b/arch/openrisc/kernel/traps.c @@ -146,8 +146,8 @@ void show_registers(struct pt_regs *regs) regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]); printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n", regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]); - printk(" RES: %08lx oGPR11: %08lx syscallno: %08lx\n", - regs->gpr[11], regs->orig_gpr11, regs->syscallno); + printk(" RES: %08lx oGPR11: %08lx\n", + regs->gpr[11], regs->orig_gpr11); printk("Process %s (pid: %d, stackpage=%08lx)\n", current->comm, current->pid, (unsigned long)current); @@ -208,8 +208,8 @@ void nommu_dump_state(struct pt_regs *regs, regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]); printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n", regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]); - printk(" RES: %08lx oGPR11: %08lx syscallno: %08lx\n", - regs->gpr[11], regs->orig_gpr11, regs->syscallno); + printk(" RES: %08lx oGPR11: %08lx\n", + regs->gpr[11], regs->orig_gpr11); printk("Process %s (pid: %d, stackpage=%08lx)\n", ((struct task_struct *)(__pa(current)))->comm, -- cgit v1.2.3-70-g09d2