int setup_signal_stack_si(unsigned long stack_top, int sig, struct k_sigaction *ka, struct pt_regs *regs, siginfo_t *info, sigset_t *mask) { struct rt_sigframe __user *frame; void __user *restorer; unsigned long save_sp = PT_REGS_SP(regs); int err = 0; stack_top &= -8UL; frame = (struct rt_sigframe __user *) stack_top - 1; if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) return 1; restorer = frame->retcode; if(ka->sa.sa_flags & SA_RESTORER) restorer = ka->sa.sa_restorer; /* See comment above about why this is here */ PT_REGS_SP(regs) = (unsigned long) frame; err |= __put_user(restorer, &frame->pretcode); err |= __put_user(sig, &frame->sig); err |= __put_user(&frame->info, &frame->pinfo); err |= __put_user(&frame->uc, &frame->puc); err |= copy_siginfo_to_user(&frame->info, info); err |= copy_ucontext_to_user(&frame->uc, &frame->fpstate, mask, save_sp); /* * This is movl $,%eax ; int $0x80 * * WE DO NOT USE IT ANY MORE! It's only left here for historical * reasons and because gdb uses it as a signature to notice * signal handler stack frames. */ err |= __put_user(0xb8, (char __user *)(frame->retcode+0)); err |= __put_user(__NR_rt_sigreturn, (int __user *)(frame->retcode+1)); err |= __put_user(0x80cd, (short __user *)(frame->retcode+5)); if(err) goto err; PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler; PT_REGS_EAX(regs) = (unsigned long) sig; PT_REGS_EDX(regs) = (unsigned long) &frame->info; PT_REGS_ECX(regs) = (unsigned long) &frame->uc; if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED)) ptrace_notify(SIGTRAP); return 0; err: PT_REGS_SP(regs) = save_sp; return err; }
int setup_signal_stack_sc(unsigned long stack_top, int sig, struct k_sigaction *ka, struct pt_regs *regs, sigset_t *mask) { struct sigframe __user *frame; void *restorer; int err = 0; stack_top &= -8UL; frame = (struct sigframe *) stack_top - 1; if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) return 1; restorer = (void *) frame->retcode; if(ka->sa.sa_flags & SA_RESTORER) restorer = ka->sa.sa_restorer; err |= __put_user(restorer, &frame->pretcode); err |= __put_user(sig, &frame->sig); err |= copy_sc_to_user(&frame->sc, NULL, regs); err |= __put_user(mask->sig[0], &frame->sc.oldmask); if (_NSIG_WORDS > 1) err |= __copy_to_user(&frame->extramask, &mask->sig[1], sizeof(frame->extramask)); /* * This is popl %eax ; movl $,%eax ; int $0x80 * * WE DO NOT USE IT ANY MORE! It's only left here for historical * reasons and because gdb uses it as a signature to notice * signal handler stack frames. */ err |= __put_user(0xb858, (short __user *)(frame->retcode+0)); err |= __put_user(__NR_sigreturn, (int __user *)(frame->retcode+2)); err |= __put_user(0x80cd, (short __user *)(frame->retcode+6)); if(err) return(err); PT_REGS_SP(regs) = (unsigned long) frame; PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler; PT_REGS_EAX(regs) = (unsigned long) sig; PT_REGS_EDX(regs) = (unsigned long) 0; PT_REGS_ECX(regs) = (unsigned long) 0; if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED)) ptrace_notify(SIGTRAP); return(0); }
int setup_signal_stack_sc(unsigned long stack_top, int sig, struct k_sigaction *ka, struct pt_regs *regs, sigset_t *mask) { struct sigframe __user *frame; void __user *restorer; unsigned long save_sp = PT_REGS_SP(regs); int err = 0; /* This is the same calculation as i386 - ((sp + 4) & 15) == 0 */ stack_top = ((stack_top + 4) & -16UL) - 4; frame = (struct sigframe __user *) stack_top - 1; if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) return 1; restorer = frame->retcode; if(ka->sa.sa_flags & SA_RESTORER) restorer = ka->sa.sa_restorer; /* Update SP now because the page fault handler refuses to extend * the stack if the faulting address is too far below the current * SP, which frame now certainly is. If there's an error, the original * value is restored on the way out. * When writing the sigcontext to the stack, we have to write the * original value, so that's passed to copy_sc_to_user, which does * the right thing with it. */ PT_REGS_SP(regs) = (unsigned long) frame; err |= __put_user(restorer, &frame->pretcode); err |= __put_user(sig, &frame->sig); err |= copy_sc_to_user(&frame->sc, NULL, regs, save_sp); err |= __put_user(mask->sig[0], &frame->sc.oldmask); if (_NSIG_WORDS > 1) err |= __copy_to_user(&frame->extramask, &mask->sig[1], sizeof(frame->extramask)); /* * This is popl %eax ; movl $,%eax ; int $0x80 * * WE DO NOT USE IT ANY MORE! It's only left here for historical * reasons and because gdb uses it as a signature to notice * signal handler stack frames. */ err |= __put_user(0xb858, (short __user *)(frame->retcode+0)); err |= __put_user(__NR_sigreturn, (int __user *)(frame->retcode+2)); err |= __put_user(0x80cd, (short __user *)(frame->retcode+6)); if(err) goto err; PT_REGS_SP(regs) = (unsigned long) frame; PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler; PT_REGS_EAX(regs) = (unsigned long) sig; PT_REGS_EDX(regs) = (unsigned long) 0; PT_REGS_ECX(regs) = (unsigned long) 0; if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED)) ptrace_notify(SIGTRAP); return 0; err: PT_REGS_SP(regs) = save_sp; return err; }