+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Port on Texas Instruments TMS320C6x architecture
- *
- * Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
- * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
- *
- * Updated for 2.6.34: Mark Salter <msalter@redhat.com>
- */
-
-#include <linux/kernel.h>
-#include <linux/uaccess.h>
-#include <linux/syscalls.h>
-#include <linux/tracehook.h>
-
-#include <asm/asm-offsets.h>
-#include <asm/ucontext.h>
-#include <asm/cacheflush.h>
-
-
-/*
- * Do a signal return, undo the signal stack.
- */
-
-#define RETCODE_SIZE (9 << 2) /* 9 instructions = 36 bytes */
-
-struct rt_sigframe {
- struct siginfo __user *pinfo;
- void __user *puc;
- struct siginfo info;
- struct ucontext uc;
- unsigned long retcode[RETCODE_SIZE >> 2];
-};
-
-static int restore_sigcontext(struct pt_regs *regs,
- struct sigcontext __user *sc)
-{
- int err = 0;
-
- /* The access_ok check was done by caller, so use __get_user here */
-#define COPY(x) (err |= __get_user(regs->x, &sc->sc_##x))
-
- COPY(sp); COPY(a4); COPY(b4); COPY(a6); COPY(b6); COPY(a8); COPY(b8);
- COPY(a0); COPY(a1); COPY(a2); COPY(a3); COPY(a5); COPY(a7); COPY(a9);
- COPY(b0); COPY(b1); COPY(b2); COPY(b3); COPY(b5); COPY(b7); COPY(b9);
-
- COPY(a16); COPY(a17); COPY(a18); COPY(a19);
- COPY(a20); COPY(a21); COPY(a22); COPY(a23);
- COPY(a24); COPY(a25); COPY(a26); COPY(a27);
- COPY(a28); COPY(a29); COPY(a30); COPY(a31);
- COPY(b16); COPY(b17); COPY(b18); COPY(b19);
- COPY(b20); COPY(b21); COPY(b22); COPY(b23);
- COPY(b24); COPY(b25); COPY(b26); COPY(b27);
- COPY(b28); COPY(b29); COPY(b30); COPY(b31);
-
- COPY(csr); COPY(pc);
-
-#undef COPY
-
- return err;
-}
-
-asmlinkage int do_rt_sigreturn(struct pt_regs *regs)
-{
- struct rt_sigframe __user *frame;
- sigset_t set;
-
- /* Always make any pending restarted system calls return -EINTR */
- current->restart_block.fn = do_no_restart_syscall;
-
- /*
- * Since we stacked the signal on a dword boundary,
- * 'sp' should be dword aligned here. If it's
- * not, then the user is trying to mess with us.
- */
- if (regs->sp & 7)
- goto badframe;
-
- frame = (struct rt_sigframe __user *) ((unsigned long) regs->sp + 8);
-
- if (!access_ok(frame, sizeof(*frame)))
- goto badframe;
- if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
- goto badframe;
-
- set_current_blocked(&set);
-
- if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
- goto badframe;
-
- return regs->a4;
-
-badframe:
- force_sig(SIGSEGV);
- return 0;
-}
-
-static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
- unsigned long mask)
-{
- int err = 0;
-
- err |= __put_user(mask, &sc->sc_mask);
-
- /* The access_ok check was done by caller, so use __put_user here */
-#define COPY(x) (err |= __put_user(regs->x, &sc->sc_##x))
-
- COPY(sp); COPY(a4); COPY(b4); COPY(a6); COPY(b6); COPY(a8); COPY(b8);
- COPY(a0); COPY(a1); COPY(a2); COPY(a3); COPY(a5); COPY(a7); COPY(a9);
- COPY(b0); COPY(b1); COPY(b2); COPY(b3); COPY(b5); COPY(b7); COPY(b9);
-
- COPY(a16); COPY(a17); COPY(a18); COPY(a19);
- COPY(a20); COPY(a21); COPY(a22); COPY(a23);
- COPY(a24); COPY(a25); COPY(a26); COPY(a27);
- COPY(a28); COPY(a29); COPY(a30); COPY(a31);
- COPY(b16); COPY(b17); COPY(b18); COPY(b19);
- COPY(b20); COPY(b21); COPY(b22); COPY(b23);
- COPY(b24); COPY(b25); COPY(b26); COPY(b27);
- COPY(b28); COPY(b29); COPY(b30); COPY(b31);
-
- COPY(csr); COPY(pc);
-
-#undef COPY
-
- return err;
-}
-
-static inline void __user *get_sigframe(struct ksignal *ksig,
- struct pt_regs *regs,
- unsigned long framesize)
-{
- unsigned long sp = sigsp(regs->sp, ksig);
-
- /*
- * No matter what happens, 'sp' must be dword
- * aligned. Otherwise, nasty things will happen
- */
- return (void __user *)((sp - framesize) & ~7);
-}
-
-static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
- struct pt_regs *regs)
-{
- struct rt_sigframe __user *frame;
- unsigned long __user *retcode;
- int err = 0;
-
- frame = get_sigframe(ksig, regs, sizeof(*frame));
-
- if (!access_ok(frame, sizeof(*frame)))
- return -EFAULT;
-
- err |= __put_user(&frame->info, &frame->pinfo);
- err |= __put_user(&frame->uc, &frame->puc);
- err |= copy_siginfo_to_user(&frame->info, &ksig->info);
-
- /* Clear all the bits of the ucontext we don't use. */
- err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
-
- err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
- err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
-
- /* Set up to return from userspace */
- retcode = (unsigned long __user *) &frame->retcode;
-
- /* The access_ok check was done above, so use __put_user here */
-#define COPY(x) (err |= __put_user(x, retcode++))
-
- COPY(0x0000002AUL | (__NR_rt_sigreturn << 7));
- /* MVK __NR_rt_sigreturn,B0 */
- COPY(0x10000000UL); /* SWE */
- COPY(0x00006000UL); /* NOP 4 */
- COPY(0x00006000UL); /* NOP 4 */
- COPY(0x00006000UL); /* NOP 4 */
- COPY(0x00006000UL); /* NOP 4 */
- COPY(0x00006000UL); /* NOP 4 */
- COPY(0x00006000UL); /* NOP 4 */
- COPY(0x00006000UL); /* NOP 4 */
-
-#undef COPY
-
- if (err)
- return -EFAULT;
-
- flush_icache_range((unsigned long) &frame->retcode,
- (unsigned long) &frame->retcode + RETCODE_SIZE);
-
- retcode = (unsigned long __user *) &frame->retcode;
-
- /* Change user context to branch to signal handler */
- regs->sp = (unsigned long) frame - 8;
- regs->b3 = (unsigned long) retcode;
- regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
-
- /* Give the signal number to the handler */
- regs->a4 = ksig->sig;
-
- /*
- * For realtime signals we must also set the second and third
- * arguments for the signal handler.
- * -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06
- */
- regs->b4 = (unsigned long)&frame->info;
- regs->a6 = (unsigned long)&frame->uc;
-
- return 0;
-}
-
-static inline void
-handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
-{
- switch (regs->a4) {
- case -ERESTARTNOHAND:
- if (!has_handler)
- goto do_restart;
- regs->a4 = -EINTR;
- break;
-
- case -ERESTARTSYS:
- if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
- regs->a4 = -EINTR;
- break;
- }
- fallthrough;
- case -ERESTARTNOINTR:
-do_restart:
- regs->a4 = regs->orig_a4;
- regs->pc -= 4;
- break;
- }
-}
-
-/*
- * handle the actual delivery of a signal to userspace
- */
-static void handle_signal(struct ksignal *ksig, struct pt_regs *regs,
- int syscall)
-{
- int ret;
-
- /* Are we from a system call? */
- if (syscall) {
- /* If so, check system call restarting.. */
- switch (regs->a4) {
- case -ERESTART_RESTARTBLOCK:
- case -ERESTARTNOHAND:
- regs->a4 = -EINTR;
- break;
-
- case -ERESTARTSYS:
- if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
- regs->a4 = -EINTR;
- break;
- }
-
- fallthrough;
- case -ERESTARTNOINTR:
- regs->a4 = regs->orig_a4;
- regs->pc -= 4;
- }
- }
-
- /* Set up the stack frame */
- ret = setup_rt_frame(ksig, sigmask_to_save(), regs);
- signal_setup_done(ret, ksig, 0);
-}
-
-/*
- * handle a potential signal
- */
-static void do_signal(struct pt_regs *regs, int syscall)
-{
- struct ksignal ksig;
-
- /* we want the common case to go fast, which is why we may in certain
- * cases get here from kernel mode */
- if (!user_mode(regs))
- return;
-
- if (get_signal(&ksig)) {
- handle_signal(&ksig, regs, syscall);
- return;
- }
-
- /* did we come from a system call? */
- if (syscall) {
- /* restart the system call - no handlers present */
- switch (regs->a4) {
- case -ERESTARTNOHAND:
- case -ERESTARTSYS:
- case -ERESTARTNOINTR:
- regs->a4 = regs->orig_a4;
- regs->pc -= 4;
- break;
-
- case -ERESTART_RESTARTBLOCK:
- regs->a4 = regs->orig_a4;
- regs->b0 = __NR_restart_syscall;
- regs->pc -= 4;
- break;
- }
- }
-
- /* if there's no signal to deliver, we just put the saved sigmask
- * back */
- restore_saved_sigmask();
-}
-
-/*
- * notification of userspace execution resumption
- * - triggered by current->work.notify_resume
- */
-asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags,
- int syscall)
-{
- /* deal with pending signal delivery */
- if (thread_info_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL))
- do_signal(regs, syscall);
-
- if (thread_info_flags & (1 << TIF_NOTIFY_RESUME))
- tracehook_notify_resume(regs);
-}
projects / linux-2.6-block.git / blobdiff