diff options
Diffstat (limited to 'arch/um/sys-x86_64/signal.c')
| -rw-r--r-- | arch/um/sys-x86_64/signal.c | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/arch/um/sys-x86_64/signal.c b/arch/um/sys-x86_64/signal.c new file mode 100644 index 000000000000..5bc5a0d796e5 --- /dev/null +++ b/arch/um/sys-x86_64/signal.c @@ -0,0 +1,276 @@ +/* + * Copyright (C) 2003 PathScale, Inc. + * Licensed under the GPL + */ + +#include "linux/stddef.h" +#include "linux/errno.h" +#include "linux/personality.h" +#include "linux/ptrace.h" +#include "asm/current.h" +#include "asm/uaccess.h" +#include "asm/sigcontext.h" +#include "asm/ptrace.h" +#include "asm/arch/ucontext.h" +#include "choose-mode.h" +#include "sysdep/ptrace.h" +#include "frame_kern.h" + +#ifdef CONFIG_MODE_SKAS + +#include "skas.h" + +static int copy_sc_from_user_skas(struct pt_regs *regs, + struct sigcontext *from) +{ + int err = 0; + +#define GETREG(regs, regno, sc, regname) \ + __get_user((regs)->regs.skas.regs[(regno) / sizeof(unsigned long)], \ + &(sc)->regname) + + err |= GETREG(regs, R8, from, r8); + err |= GETREG(regs, R9, from, r9); + err |= GETREG(regs, R10, from, r10); + err |= GETREG(regs, R11, from, r11); + err |= GETREG(regs, R12, from, r12); + err |= GETREG(regs, R13, from, r13); + err |= GETREG(regs, R14, from, r14); + err |= GETREG(regs, R15, from, r15); + err |= GETREG(regs, RDI, from, rdi); + err |= GETREG(regs, RSI, from, rsi); + err |= GETREG(regs, RBP, from, rbp); + err |= GETREG(regs, RBX, from, rbx); + err |= GETREG(regs, RDX, from, rdx); + err |= GETREG(regs, RAX, from, rax); + err |= GETREG(regs, RCX, from, rcx); + err |= GETREG(regs, RSP, from, rsp); + err |= GETREG(regs, RIP, from, rip); + err |= GETREG(regs, EFLAGS, from, eflags); + err |= GETREG(regs, CS, from, cs); + +#undef GETREG + + return(err); +} + +int copy_sc_to_user_skas(struct sigcontext *to, struct _fpstate *to_fp, + struct pt_regs *regs, unsigned long mask) +{ + unsigned long eflags; + int err = 0; + + err |= __put_user(0, &to->gs); + err |= __put_user(0, &to->fs); + +#define PUTREG(regs, regno, sc, regname) \ + __put_user((regs)->regs.skas.regs[(regno) / sizeof(unsigned long)], \ + &(sc)->regname) + + err |= PUTREG(regs, RDI, to, rdi); + err |= PUTREG(regs, RSI, to, rsi); + err |= PUTREG(regs, RBP, to, rbp); + err |= PUTREG(regs, RSP, to, rsp); + err |= PUTREG(regs, RBX, to, rbx); + err |= PUTREG(regs, RDX, to, rdx); + err |= PUTREG(regs, RCX, to, rcx); + err |= PUTREG(regs, RAX, to, rax); + err |= PUTREG(regs, R8, to, r8); + err |= PUTREG(regs, R9, to, r9); + err |= PUTREG(regs, R10, to, r10); + err |= PUTREG(regs, R11, to, r11); + err |= PUTREG(regs, R12, to, r12); + err |= PUTREG(regs, R13, to, r13); + err |= PUTREG(regs, R14, to, r14); + err |= PUTREG(regs, R15, to, r15); + err |= PUTREG(regs, CS, to, cs); /* XXX x86_64 doesn't do this */ + err |= __put_user(current->thread.err, &to->err); + err |= __put_user(current->thread.trap_no, &to->trapno); + err |= PUTREG(regs, RIP, to, rip); + err |= PUTREG(regs, EFLAGS, to, eflags); +#undef PUTREG + + err |= __put_user(mask, &to->oldmask); + err |= __put_user(current->thread.cr2, &to->cr2); + + return(err); +} + +#endif + +#ifdef CONFIG_MODE_TT +int copy_sc_from_user_tt(struct sigcontext *to, struct sigcontext *from, + int fpsize) +{ + struct _fpstate *to_fp, *from_fp; + unsigned long sigs; + int err; + + to_fp = to->fpstate; + from_fp = from->fpstate; + sigs = to->oldmask; + err = copy_from_user(to, from, sizeof(*to)); + to->oldmask = sigs; + return(err); +} + +int copy_sc_to_user_tt(struct sigcontext *to, struct _fpstate *fp, + struct sigcontext *from, int fpsize) +{ + struct _fpstate *to_fp, *from_fp; + int err; + + to_fp = (fp ? fp : (struct _fpstate *) (to + 1)); + from_fp = from->fpstate; + err = copy_to_user(to, from, sizeof(*to)); + return(err); +} + +#endif + +static int copy_sc_from_user(struct pt_regs *to, void __user *from) +{ + int ret; + + ret = CHOOSE_MODE(copy_sc_from_user_tt(UPT_SC(&to->regs), from, + sizeof(struct _fpstate)), + copy_sc_from_user_skas(to, from)); + return(ret); +} + +static int copy_sc_to_user(struct sigcontext *to, struct _fpstate *fp, + struct pt_regs *from, unsigned long mask) +{ + return(CHOOSE_MODE(copy_sc_to_user_tt(to, fp, UPT_SC(&from->regs), + sizeof(*fp)), + copy_sc_to_user_skas(to, fp, from, mask))); +} + +struct rt_sigframe +{ + char *pretcode; + struct ucontext uc; + struct siginfo info; +}; + +#define round_down(m, n) (((m) / (n)) * (n)) + +int setup_signal_stack_si(unsigned long stack_top, int sig, + struct k_sigaction *ka, struct pt_regs * regs, + siginfo_t *info, sigset_t *set) +{ + struct rt_sigframe __user *frame; + struct _fpstate __user *fp = NULL; + int err = 0; + struct task_struct *me = current; + + frame = (struct rt_sigframe __user *) + round_down(stack_top - sizeof(struct rt_sigframe), 16) - 8; + frame -= 128; + + if (!access_ok(VERIFY_WRITE, fp, sizeof(struct _fpstate))) + goto out; + +#if 0 /* XXX */ + if (save_i387(fp) < 0) + err |= -1; +#endif + if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) + goto out; + + if (ka->sa.sa_flags & SA_SIGINFO) { + err |= copy_siginfo_to_user(&frame->info, info); + if (err) + goto out; + } + + /* Create the ucontext. */ + err |= __put_user(0, &frame->uc.uc_flags); + err |= __put_user(0, &frame->uc.uc_link); + err |= __put_user(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp); + err |= __put_user(sas_ss_flags(PT_REGS_SP(regs)), + &frame->uc.uc_stack.ss_flags); + err |= __put_user(me->sas_ss_size, &frame->uc.uc_stack.ss_size); + err |= copy_sc_to_user(&frame->uc.uc_mcontext, fp, regs, set->sig[0]); + err |= __put_user(fp, &frame->uc.uc_mcontext.fpstate); + if (sizeof(*set) == 16) { + __put_user(set->sig[0], &frame->uc.uc_sigmask.sig[0]); + __put_user(set->sig[1], &frame->uc.uc_sigmask.sig[1]); + } + else + err |= __copy_to_user(&frame->uc.uc_sigmask, set, + sizeof(*set)); + + /* Set up to return from userspace. If provided, use a stub + already in userspace. */ + /* x86-64 should always use SA_RESTORER. */ + if (ka->sa.sa_flags & SA_RESTORER) + err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); + else + /* could use a vstub here */ + goto out; + + if (err) + goto out; + + /* Set up registers for signal handler */ + { + struct exec_domain *ed = current_thread_info()->exec_domain; + if (unlikely(ed && ed->signal_invmap && sig < 32)) + sig = ed->signal_invmap[sig]; + } + + PT_REGS_RDI(regs) = sig; + /* In case the signal handler was declared without prototypes */ + PT_REGS_RAX(regs) = 0; + + /* This also works for non SA_SIGINFO handlers because they expect the + next argument after the signal number on the stack. */ + PT_REGS_RSI(regs) = (unsigned long) &frame->info; + PT_REGS_RDX(regs) = (unsigned long) &frame->uc; + PT_REGS_RIP(regs) = (unsigned long) ka->sa.sa_handler; + + PT_REGS_RSP(regs) = (unsigned long) frame; + out: + return(err); +} + +long sys_rt_sigreturn(struct pt_regs *regs) +{ + unsigned long sp = PT_REGS_SP(¤t->thread.regs); + struct rt_sigframe __user *frame = + (struct rt_sigframe __user *)(sp - 8); + struct ucontext __user *uc = &frame->uc; + sigset_t set; + + if(copy_from_user(&set, &uc->uc_sigmask, sizeof(set))) + goto segfault; + + sigdelsetmask(&set, ~_BLOCKABLE); + + spin_lock_irq(¤t->sighand->siglock); + current->blocked = set; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + + if(copy_sc_from_user(¤t->thread.regs, &uc->uc_mcontext)) + goto segfault; + + /* Avoid ERESTART handling */ + PT_REGS_SYSCALL_NR(¤t->thread.regs) = -1; + return(PT_REGS_SYSCALL_RET(¤t->thread.regs)); + + segfault: + force_sig(SIGSEGV, current); + return 0; +} +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ |