diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/m68k/kernel/signal.c | 1144 |
1 files changed, 1144 insertions, 0 deletions
diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c new file mode 100644 index 000000000..131e87a55 --- /dev/null +++ b/arch/m68k/kernel/signal.c @@ -0,0 +1,1144 @@ +/* + * linux/arch/m68k/kernel/signal.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + */ + +/* + * Linux/m68k support by Hamish Macdonald + * + * 68060 fixes by Jesper Skov + * + * 1997-12-01 Modified for POSIX.1b signals by Andreas Schwab + * + * mathemu support by Roman Zippel + * (Note: fpstate in the signal context is completely ignored for the emulator + * and the internal floating point format is put on stack) + */ + +/* + * ++roman (07/09/96): implemented signal stacks (specially for tosemu on + * Atari :-) Current limitation: Only one sigstack can be active at one time. + * If a second signal with SA_ONSTACK set arrives while working on a sigstack, + * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested + * signal handlers! + */ + +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/kernel.h> +#include <linux/signal.h> +#include <linux/syscalls.h> +#include <linux/errno.h> +#include <linux/wait.h> +#include <linux/ptrace.h> +#include <linux/unistd.h> +#include <linux/stddef.h> +#include <linux/highuid.h> +#include <linux/personality.h> +#include <linux/tty.h> +#include <linux/binfmts.h> +#include <linux/extable.h> +#include <linux/tracehook.h> + +#include <asm/setup.h> +#include <linux/uaccess.h> +#include <asm/traps.h> +#include <asm/ucontext.h> +#include <asm/cacheflush.h> + +#ifdef CONFIG_MMU + +/* + * Handle the slight differences in classic 68k and ColdFire trap frames. + */ +#ifdef CONFIG_COLDFIRE +#define FORMAT 4 +#define FMT4SIZE 0 +#else +#define FORMAT 0 +#define FMT4SIZE sizeof_field(struct frame, un.fmt4) +#endif + +static const int frame_size_change[16] = { + [1] = -1, /* sizeof_field(struct frame, un.fmt1), */ + [2] = sizeof_field(struct frame, un.fmt2), + [3] = sizeof_field(struct frame, un.fmt3), + [4] = FMT4SIZE, + [5] = -1, /* sizeof_field(struct frame, un.fmt5), */ + [6] = -1, /* sizeof_field(struct frame, un.fmt6), */ + [7] = sizeof_field(struct frame, un.fmt7), + [8] = -1, /* sizeof_field(struct frame, un.fmt8), */ + [9] = sizeof_field(struct frame, un.fmt9), + [10] = sizeof_field(struct frame, un.fmta), + [11] = sizeof_field(struct frame, un.fmtb), + [12] = -1, /* sizeof_field(struct frame, un.fmtc), */ + [13] = -1, /* sizeof_field(struct frame, un.fmtd), */ + [14] = -1, /* sizeof_field(struct frame, un.fmte), */ + [15] = -1, /* sizeof_field(struct frame, un.fmtf), */ +}; + +static inline int frame_extra_sizes(int f) +{ + return frame_size_change[f]; +} + +int fixup_exception(struct pt_regs *regs) +{ + const struct exception_table_entry *fixup; + struct pt_regs *tregs; + + /* Are we prepared to handle this kernel fault? */ + fixup = search_exception_tables(regs->pc); + if (!fixup) + return 0; + + /* Create a new four word stack frame, discarding the old one. */ + regs->stkadj = frame_extra_sizes(regs->format); + tregs = (struct pt_regs *)((long)regs + regs->stkadj); + tregs->vector = regs->vector; + tregs->format = FORMAT; + tregs->pc = fixup->fixup; + tregs->sr = regs->sr; + + return 1; +} + +static inline void push_cache (unsigned long vaddr) +{ + /* + * Using the old cache_push_v() was really a big waste. + * + * What we are trying to do is to flush 8 bytes to ram. + * Flushing 2 cache lines of 16 bytes is much cheaper than + * flushing 1 or 2 pages, as previously done in + * cache_push_v(). + * Jes + */ + if (CPU_IS_040) { + unsigned long temp; + + __asm__ __volatile__ (".chip 68040\n\t" + "nop\n\t" + "ptestr (%1)\n\t" + "movec %%mmusr,%0\n\t" + ".chip 68k" + : "=r" (temp) + : "a" (vaddr)); + + temp &= PAGE_MASK; + temp |= vaddr & ~PAGE_MASK; + + __asm__ __volatile__ (".chip 68040\n\t" + "nop\n\t" + "cpushl %%bc,(%0)\n\t" + ".chip 68k" + : : "a" (temp)); + } + else if (CPU_IS_060) { + unsigned long temp; + __asm__ __volatile__ (".chip 68060\n\t" + "plpar (%0)\n\t" + ".chip 68k" + : "=a" (temp) + : "0" (vaddr)); + __asm__ __volatile__ (".chip 68060\n\t" + "cpushl %%bc,(%0)\n\t" + ".chip 68k" + : : "a" (temp)); + } else if (!CPU_IS_COLDFIRE) { + /* + * 68030/68020 have no writeback cache; + * still need to clear icache. + * Note that vaddr is guaranteed to be long word aligned. + */ + unsigned long temp; + asm volatile ("movec %%cacr,%0" : "=r" (temp)); + temp += 4; + asm volatile ("movec %0,%%caar\n\t" + "movec %1,%%cacr" + : : "r" (vaddr), "r" (temp)); + asm volatile ("movec %0,%%caar\n\t" + "movec %1,%%cacr" + : : "r" (vaddr + 4), "r" (temp)); + } else { + /* CPU_IS_COLDFIRE */ +#if defined(CONFIG_CACHE_COPYBACK) + flush_cf_dcache(0, DCACHE_MAX_ADDR); +#endif + /* Invalidate instruction cache for the pushed bytes */ + clear_cf_icache(vaddr, vaddr + 8); + } +} + +static inline void adjustformat(struct pt_regs *regs) +{ +} + +static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs) +{ +} + +#else /* CONFIG_MMU */ + +void ret_from_user_signal(void); +void ret_from_user_rt_signal(void); + +static inline int frame_extra_sizes(int f) +{ + /* No frame size adjustments required on non-MMU CPUs */ + return 0; +} + +static inline void adjustformat(struct pt_regs *regs) +{ + /* + * set format byte to make stack appear modulo 4, which it will + * be when doing the rte + */ + regs->format = 0x4; +} + +static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs) +{ + sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5; +} + +static inline void push_cache(unsigned long vaddr) +{ +} + +#endif /* CONFIG_MMU */ + +/* + * Do a signal return; undo the signal stack. + * + * Keep the return code on the stack quadword aligned! + * That makes the cache flush below easier. + */ + +struct sigframe +{ + char __user *pretcode; + int sig; + int code; + struct sigcontext __user *psc; + char retcode[8]; + unsigned long extramask[_NSIG_WORDS-1]; + struct sigcontext sc; +}; + +struct rt_sigframe +{ + char __user *pretcode; + int sig; + struct siginfo __user *pinfo; + void __user *puc; + char retcode[8]; + struct siginfo info; + struct ucontext uc; +}; + +#define FPCONTEXT_SIZE 216 +#define uc_fpstate uc_filler[0] +#define uc_formatvec uc_filler[FPCONTEXT_SIZE/4] +#define uc_extra uc_filler[FPCONTEXT_SIZE/4+1] + +#ifdef CONFIG_FPU + +static unsigned char fpu_version; /* version number of fpu, set by setup_frame */ + +static inline int restore_fpu_state(struct sigcontext *sc) +{ + int err = 1; + + if (FPU_IS_EMU) { + /* restore registers */ + memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12); + memcpy(current->thread.fp, sc->sc_fpregs, 24); + return 0; + } + + if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { + /* Verify the frame format. */ + if (!(CPU_IS_060 || CPU_IS_COLDFIRE) && + (sc->sc_fpstate[0] != fpu_version)) + goto out; + if (CPU_IS_020_OR_030) { + if (m68k_fputype & FPU_68881 && + !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4)) + goto out; + if (m68k_fputype & FPU_68882 && + !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4)) + goto out; + } else if (CPU_IS_040) { + if (!(sc->sc_fpstate[1] == 0x00 || + sc->sc_fpstate[1] == 0x28 || + sc->sc_fpstate[1] == 0x60)) + goto out; + } else if (CPU_IS_060) { + if (!(sc->sc_fpstate[3] == 0x00 || + sc->sc_fpstate[3] == 0x60 || + sc->sc_fpstate[3] == 0xe0)) + goto out; + } else if (CPU_IS_COLDFIRE) { + if (!(sc->sc_fpstate[0] == 0x00 || + sc->sc_fpstate[0] == 0x05 || + sc->sc_fpstate[0] == 0xe5)) + goto out; + } else + goto out; + + if (CPU_IS_COLDFIRE) { + __asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t" + "fmovel %1,%%fpcr\n\t" + "fmovel %2,%%fpsr\n\t" + "fmovel %3,%%fpiar" + : /* no outputs */ + : "m" (sc->sc_fpregs[0]), + "m" (sc->sc_fpcntl[0]), + "m" (sc->sc_fpcntl[1]), + "m" (sc->sc_fpcntl[2])); + } else { + __asm__ volatile (".chip 68k/68881\n\t" + "fmovemx %0,%%fp0-%%fp1\n\t" + "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" + ".chip 68k" + : /* no outputs */ + : "m" (*sc->sc_fpregs), + "m" (*sc->sc_fpcntl)); + } + } + + if (CPU_IS_COLDFIRE) { + __asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate)); + } else { + __asm__ volatile (".chip 68k/68881\n\t" + "frestore %0\n\t" + ".chip 68k" + : : "m" (*sc->sc_fpstate)); + } + err = 0; + +out: + return err; +} + +static inline int rt_restore_fpu_state(struct ucontext __user *uc) +{ + unsigned char fpstate[FPCONTEXT_SIZE]; + int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0); + fpregset_t fpregs; + int err = 1; + + if (FPU_IS_EMU) { + /* restore fpu control register */ + if (__copy_from_user(current->thread.fpcntl, + uc->uc_mcontext.fpregs.f_fpcntl, 12)) + goto out; + /* restore all other fpu register */ + if (__copy_from_user(current->thread.fp, + uc->uc_mcontext.fpregs.f_fpregs, 96)) + goto out; + return 0; + } + + if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate)) + goto out; + if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { + if (!(CPU_IS_060 || CPU_IS_COLDFIRE)) + context_size = fpstate[1]; + /* Verify the frame format. */ + if (!(CPU_IS_060 || CPU_IS_COLDFIRE) && + (fpstate[0] != fpu_version)) + goto out; + if (CPU_IS_020_OR_030) { + if (m68k_fputype & FPU_68881 && + !(context_size == 0x18 || context_size == 0xb4)) + goto out; + if (m68k_fputype & FPU_68882 && + !(context_size == 0x38 || context_size == 0xd4)) + goto out; + } else if (CPU_IS_040) { + if (!(context_size == 0x00 || + context_size == 0x28 || + context_size == 0x60)) + goto out; + } else if (CPU_IS_060) { + if (!(fpstate[3] == 0x00 || + fpstate[3] == 0x60 || + fpstate[3] == 0xe0)) + goto out; + } else if (CPU_IS_COLDFIRE) { + if (!(fpstate[3] == 0x00 || + fpstate[3] == 0x05 || + fpstate[3] == 0xe5)) + goto out; + } else + goto out; + if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs, + sizeof(fpregs))) + goto out; + + if (CPU_IS_COLDFIRE) { + __asm__ volatile ("fmovemd %0,%%fp0-%%fp7\n\t" + "fmovel %1,%%fpcr\n\t" + "fmovel %2,%%fpsr\n\t" + "fmovel %3,%%fpiar" + : /* no outputs */ + : "m" (fpregs.f_fpregs[0]), + "m" (fpregs.f_fpcntl[0]), + "m" (fpregs.f_fpcntl[1]), + "m" (fpregs.f_fpcntl[2])); + } else { + __asm__ volatile (".chip 68k/68881\n\t" + "fmovemx %0,%%fp0-%%fp7\n\t" + "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" + ".chip 68k" + : /* no outputs */ + : "m" (*fpregs.f_fpregs), + "m" (*fpregs.f_fpcntl)); + } + } + if (context_size && + __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1, + context_size)) + goto out; + + if (CPU_IS_COLDFIRE) { + __asm__ volatile ("frestore %0" : : "m" (*fpstate)); + } else { + __asm__ volatile (".chip 68k/68881\n\t" + "frestore %0\n\t" + ".chip 68k" + : : "m" (*fpstate)); + } + err = 0; + +out: + return err; +} + +/* + * Set up a signal frame. + */ +static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) +{ + if (FPU_IS_EMU) { + /* save registers */ + memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12); + memcpy(sc->sc_fpregs, current->thread.fp, 24); + return; + } + + if (CPU_IS_COLDFIRE) { + __asm__ volatile ("fsave %0" + : : "m" (*sc->sc_fpstate) : "memory"); + } else { + __asm__ volatile (".chip 68k/68881\n\t" + "fsave %0\n\t" + ".chip 68k" + : : "m" (*sc->sc_fpstate) : "memory"); + } + + if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { + fpu_version = sc->sc_fpstate[0]; + if (CPU_IS_020_OR_030 && !regs->stkadj && + regs->vector >= (VEC_FPBRUC * 4) && + regs->vector <= (VEC_FPNAN * 4)) { + /* Clear pending exception in 68882 idle frame */ + if (*(unsigned short *) sc->sc_fpstate == 0x1f38) + sc->sc_fpstate[0x38] |= 1 << 3; + } + + if (CPU_IS_COLDFIRE) { + __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t" + "fmovel %%fpcr,%1\n\t" + "fmovel %%fpsr,%2\n\t" + "fmovel %%fpiar,%3" + : "=m" (sc->sc_fpregs[0]), + "=m" (sc->sc_fpcntl[0]), + "=m" (sc->sc_fpcntl[1]), + "=m" (sc->sc_fpcntl[2]) + : /* no inputs */ + : "memory"); + } else { + __asm__ volatile (".chip 68k/68881\n\t" + "fmovemx %%fp0-%%fp1,%0\n\t" + "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" + ".chip 68k" + : "=m" (*sc->sc_fpregs), + "=m" (*sc->sc_fpcntl) + : /* no inputs */ + : "memory"); + } + } +} + +static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs) +{ + unsigned char fpstate[FPCONTEXT_SIZE]; + int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0); + int err = 0; + + if (FPU_IS_EMU) { + /* save fpu control register */ + err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl, + current->thread.fpcntl, 12); + /* save all other fpu register */ + err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs, + current->thread.fp, 96); + return err; + } + + if (CPU_IS_COLDFIRE) { + __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory"); + } else { + __asm__ volatile (".chip 68k/68881\n\t" + "fsave %0\n\t" + ".chip 68k" + : : "m" (*fpstate) : "memory"); + } + + err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate); + if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { + fpregset_t fpregs; + if (!(CPU_IS_060 || CPU_IS_COLDFIRE)) + context_size = fpstate[1]; + fpu_version = fpstate[0]; + if (CPU_IS_020_OR_030 && !regs->stkadj && + regs->vector >= (VEC_FPBRUC * 4) && + regs->vector <= (VEC_FPNAN * 4)) { + /* Clear pending exception in 68882 idle frame */ + if (*(unsigned short *) fpstate == 0x1f38) + fpstate[0x38] |= 1 << 3; + } + if (CPU_IS_COLDFIRE) { + __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t" + "fmovel %%fpcr,%1\n\t" + "fmovel %%fpsr,%2\n\t" + "fmovel %%fpiar,%3" + : "=m" (fpregs.f_fpregs[0]), + "=m" (fpregs.f_fpcntl[0]), + "=m" (fpregs.f_fpcntl[1]), + "=m" (fpregs.f_fpcntl[2]) + : /* no inputs */ + : "memory"); + } else { + __asm__ volatile (".chip 68k/68881\n\t" + "fmovemx %%fp0-%%fp7,%0\n\t" + "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" + ".chip 68k" + : "=m" (*fpregs.f_fpregs), + "=m" (*fpregs.f_fpcntl) + : /* no inputs */ + : "memory"); + } + err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs, + sizeof(fpregs)); + } + if (context_size) + err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4, + context_size); + return err; +} + +#else /* CONFIG_FPU */ + +/* + * For the case with no FPU configured these all do nothing. + */ +static inline int restore_fpu_state(struct sigcontext *sc) +{ + return 0; +} + +static inline int rt_restore_fpu_state(struct ucontext __user *uc) +{ + return 0; +} + +static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) +{ +} + +static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs) +{ + return 0; +} + +#endif /* CONFIG_FPU */ + +static inline void siginfo_build_tests(void) +{ + /* + * This needs to be tested on m68k as it has a lesser + * alignment requirement than x86 and that can cause surprises. + */ + + /* This is part of the ABI and can never change in size: */ + BUILD_BUG_ON(sizeof(siginfo_t) != 128); + + /* Ensure the known fields never change in location */ + BUILD_BUG_ON(offsetof(siginfo_t, si_signo) != 0); + BUILD_BUG_ON(offsetof(siginfo_t, si_errno) != 4); + BUILD_BUG_ON(offsetof(siginfo_t, si_code) != 8); + + /* _kill */ + BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c); + BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10); + + /* _timer */ + BUILD_BUG_ON(offsetof(siginfo_t, si_tid) != 0x0c); + BUILD_BUG_ON(offsetof(siginfo_t, si_overrun) != 0x10); + BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x14); + + /* _rt */ + BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c); + BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10); + BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x14); + + /* _sigchld */ + BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c); + BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10); + BUILD_BUG_ON(offsetof(siginfo_t, si_status) != 0x14); + BUILD_BUG_ON(offsetof(siginfo_t, si_utime) != 0x18); + BUILD_BUG_ON(offsetof(siginfo_t, si_stime) != 0x1c); + + /* _sigfault */ + BUILD_BUG_ON(offsetof(siginfo_t, si_addr) != 0x0c); + + /* _sigfault._mcerr */ + BUILD_BUG_ON(offsetof(siginfo_t, si_addr_lsb) != 0x10); + + /* _sigfault._addr_bnd */ + BUILD_BUG_ON(offsetof(siginfo_t, si_lower) != 0x12); + BUILD_BUG_ON(offsetof(siginfo_t, si_upper) != 0x16); + + /* _sigfault._addr_pkey */ + BUILD_BUG_ON(offsetof(siginfo_t, si_pkey) != 0x12); + + /* _sigpoll */ + BUILD_BUG_ON(offsetof(siginfo_t, si_band) != 0x0c); + BUILD_BUG_ON(offsetof(siginfo_t, si_fd) != 0x10); + + /* _sigsys */ + BUILD_BUG_ON(offsetof(siginfo_t, si_call_addr) != 0x0c); + BUILD_BUG_ON(offsetof(siginfo_t, si_syscall) != 0x10); + BUILD_BUG_ON(offsetof(siginfo_t, si_arch) != 0x14); + + /* any new si_fields should be added here */ +} + +static int mangle_kernel_stack(struct pt_regs *regs, int formatvec, + void __user *fp) +{ + int fsize = frame_extra_sizes(formatvec >> 12); + if (fsize < 0) { + /* + * user process trying to return with weird frame format + */ + pr_debug("user process returning with weird frame format\n"); + return 1; + } + if (!fsize) { + regs->format = formatvec >> 12; + regs->vector = formatvec & 0xfff; + } else { + struct switch_stack *sw = (struct switch_stack *)regs - 1; + /* yes, twice as much as max(sizeof(frame.un.fmt<x>)) */ + unsigned long buf[sizeof_field(struct frame, un) / 2]; + + /* that'll make sure that expansion won't crap over data */ + if (copy_from_user(buf + fsize / 4, fp, fsize)) + return 1; + + /* point of no return */ + regs->format = formatvec >> 12; + regs->vector = formatvec & 0xfff; +#define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack)) + __asm__ __volatile__ ( +#ifdef CONFIG_COLDFIRE + " movel %0,%/sp\n\t" + " bra ret_from_signal\n" +#else + " movel %0,%/a0\n\t" + " subl %1,%/a0\n\t" /* make room on stack */ + " movel %/a0,%/sp\n\t" /* set stack pointer */ + /* move switch_stack and pt_regs */ + "1: movel %0@+,%/a0@+\n\t" + " dbra %2,1b\n\t" + " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */ + " lsrl #2,%1\n\t" + " subql #1,%1\n\t" + /* copy to the gap we'd made */ + "2: movel %4@+,%/a0@+\n\t" + " dbra %1,2b\n\t" + " bral ret_from_signal\n" +#endif + : /* no outputs, it doesn't ever return */ + : "a" (sw), "d" (fsize), "d" (frame_offset/4-1), + "n" (frame_offset), "a" (buf + fsize/4) + : "a0"); +#undef frame_offset + } + return 0; +} + +static inline int +restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp) +{ + int formatvec; + struct sigcontext context; + int err = 0; + + siginfo_build_tests(); + + /* Always make any pending restarted system calls return -EINTR */ + current->restart_block.fn = do_no_restart_syscall; + + /* get previous context */ + if (copy_from_user(&context, usc, sizeof(context))) + goto badframe; + + /* restore passed registers */ + regs->d0 = context.sc_d0; + regs->d1 = context.sc_d1; + regs->a0 = context.sc_a0; + regs->a1 = context.sc_a1; + regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff); + regs->pc = context.sc_pc; + regs->orig_d0 = -1; /* disable syscall checks */ + wrusp(context.sc_usp); + formatvec = context.sc_formatvec; + + err = restore_fpu_state(&context); + + if (err || mangle_kernel_stack(regs, formatvec, fp)) + goto badframe; + + return 0; + +badframe: + return 1; +} + +static inline int +rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw, + struct ucontext __user *uc) +{ + int temp; + greg_t __user *gregs = uc->uc_mcontext.gregs; + unsigned long usp; + int err; + + /* Always make any pending restarted system calls return -EINTR */ + current->restart_block.fn = do_no_restart_syscall; + + err = __get_user(temp, &uc->uc_mcontext.version); + if (temp != MCONTEXT_VERSION) + goto badframe; + /* restore passed registers */ + err |= __get_user(regs->d0, &gregs[0]); + err |= __get_user(regs->d1, &gregs[1]); + err |= __get_user(regs->d2, &gregs[2]); + err |= __get_user(regs->d3, &gregs[3]); + err |= __get_user(regs->d4, &gregs[4]); + err |= __get_user(regs->d5, &gregs[5]); + err |= __get_user(sw->d6, &gregs[6]); + err |= __get_user(sw->d7, &gregs[7]); + err |= __get_user(regs->a0, &gregs[8]); + err |= __get_user(regs->a1, &gregs[9]); + err |= __get_user(regs->a2, &gregs[10]); + err |= __get_user(sw->a3, &gregs[11]); + err |= __get_user(sw->a4, &gregs[12]); + err |= __get_user(sw->a5, &gregs[13]); + err |= __get_user(sw->a6, &gregs[14]); + err |= __get_user(usp, &gregs[15]); + wrusp(usp); + err |= __get_user(regs->pc, &gregs[16]); + err |= __get_user(temp, &gregs[17]); + regs->sr = (regs->sr & 0xff00) | (temp & 0xff); + regs->orig_d0 = -1; /* disable syscall checks */ + err |= __get_user(temp, &uc->uc_formatvec); + + err |= rt_restore_fpu_state(uc); + err |= restore_altstack(&uc->uc_stack); + + if (err) + goto badframe; + + if (mangle_kernel_stack(regs, temp, &uc->uc_extra)) + goto badframe; + + return 0; + +badframe: + return 1; +} + +asmlinkage int do_sigreturn(struct pt_regs *regs, struct switch_stack *sw) +{ + unsigned long usp = rdusp(); + struct sigframe __user *frame = (struct sigframe __user *)(usp - 4); + sigset_t set; + + if (!access_ok(frame, sizeof(*frame))) + goto badframe; + if (__get_user(set.sig[0], &frame->sc.sc_mask) || + (_NSIG_WORDS > 1 && + __copy_from_user(&set.sig[1], &frame->extramask, + sizeof(frame->extramask)))) + goto badframe; + + set_current_blocked(&set); + + if (restore_sigcontext(regs, &frame->sc, frame + 1)) + goto badframe; + return regs->d0; + +badframe: + force_sig(SIGSEGV); + return 0; +} + +asmlinkage int do_rt_sigreturn(struct pt_regs *regs, struct switch_stack *sw) +{ + unsigned long usp = rdusp(); + struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4); + sigset_t set; + + 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 (rt_restore_ucontext(regs, sw, &frame->uc)) + goto badframe; + return regs->d0; + +badframe: + force_sig(SIGSEGV); + return 0; +} + +static inline struct pt_regs *rte_regs(struct pt_regs *regs) +{ + return (void *)regs + regs->stkadj; +} + +static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs, + unsigned long mask) +{ + struct pt_regs *tregs = rte_regs(regs); + sc->sc_mask = mask; + sc->sc_usp = rdusp(); + sc->sc_d0 = regs->d0; + sc->sc_d1 = regs->d1; + sc->sc_a0 = regs->a0; + sc->sc_a1 = regs->a1; + sc->sc_sr = tregs->sr; + sc->sc_pc = tregs->pc; + sc->sc_formatvec = tregs->format << 12 | tregs->vector; + save_a5_state(sc, regs); + save_fpu_state(sc, regs); +} + +static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs) +{ + struct switch_stack *sw = (struct switch_stack *)regs - 1; + struct pt_regs *tregs = rte_regs(regs); + greg_t __user *gregs = uc->uc_mcontext.gregs; + int err = 0; + + err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version); + err |= __put_user(regs->d0, &gregs[0]); + err |= __put_user(regs->d1, &gregs[1]); + err |= __put_user(regs->d2, &gregs[2]); + err |= __put_user(regs->d3, &gregs[3]); + err |= __put_user(regs->d4, &gregs[4]); + err |= __put_user(regs->d5, &gregs[5]); + err |= __put_user(sw->d6, &gregs[6]); + err |= __put_user(sw->d7, &gregs[7]); + err |= __put_user(regs->a0, &gregs[8]); + err |= __put_user(regs->a1, &gregs[9]); + err |= __put_user(regs->a2, &gregs[10]); + err |= __put_user(sw->a3, &gregs[11]); + err |= __put_user(sw->a4, &gregs[12]); + err |= __put_user(sw->a5, &gregs[13]); + err |= __put_user(sw->a6, &gregs[14]); + err |= __put_user(rdusp(), &gregs[15]); + err |= __put_user(tregs->pc, &gregs[16]); + err |= __put_user(tregs->sr, &gregs[17]); + err |= __put_user((tregs->format << 12) | tregs->vector, &uc->uc_formatvec); + err |= rt_save_fpu_state(uc, regs); + return err; +} + +static inline void __user * +get_sigframe(struct ksignal *ksig, struct pt_regs *tregs, size_t frame_size) +{ + unsigned long usp = sigsp(rdusp(), ksig); + unsigned long gap = 0; + + if (CPU_IS_020_OR_030 && tregs->format == 0xb) { + /* USP is unreliable so use worst-case value */ + gap = 256; + } + + return (void __user *)((usp - gap - frame_size) & -8UL); +} + +static int setup_frame(struct ksignal *ksig, sigset_t *set, + struct pt_regs *regs) +{ + struct sigframe __user *frame; + struct pt_regs *tregs = rte_regs(regs); + int fsize = frame_extra_sizes(tregs->format); + struct sigcontext context; + int err = 0, sig = ksig->sig; + + if (fsize < 0) { + pr_debug("setup_frame: Unknown frame format %#x\n", + tregs->format); + return -EFAULT; + } + + frame = get_sigframe(ksig, tregs, sizeof(*frame) + fsize); + + if (fsize) + err |= copy_to_user (frame + 1, regs + 1, fsize); + + err |= __put_user(sig, &frame->sig); + + err |= __put_user(tregs->vector, &frame->code); + err |= __put_user(&frame->sc, &frame->psc); + + if (_NSIG_WORDS > 1) + err |= copy_to_user(frame->extramask, &set->sig[1], + sizeof(frame->extramask)); + + setup_sigcontext(&context, regs, set->sig[0]); + err |= copy_to_user (&frame->sc, &context, sizeof(context)); + + /* Set up to return from userspace. */ +#ifdef CONFIG_MMU + err |= __put_user(frame->retcode, &frame->pretcode); + /* moveq #,d0; trap #0 */ + err |= __put_user(0x70004e40 + (__NR_sigreturn << 16), + (long __user *)(frame->retcode)); +#else + err |= __put_user((long) ret_from_user_signal, + (long __user *) &frame->pretcode); +#endif + + if (err) + return -EFAULT; + + push_cache ((unsigned long) &frame->retcode); + + /* + * This is subtle; if we build more than one sigframe, all but the + * first one will see frame format 0 and have fsize == 0, so we won't + * screw stkadj. + */ + if (fsize) { + regs->stkadj = fsize; + tregs = rte_regs(regs); + pr_debug("Performing stackadjust=%04lx\n", regs->stkadj); + tregs->vector = 0; + tregs->format = 0; + tregs->sr = regs->sr; + } + + /* + * Set up registers for signal handler. All the state we are about + * to destroy is successfully copied to sigframe. + */ + wrusp ((unsigned long) frame); + tregs->pc = (unsigned long) ksig->ka.sa.sa_handler; + adjustformat(regs); + + return 0; +} + +static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, + struct pt_regs *regs) +{ + struct rt_sigframe __user *frame; + struct pt_regs *tregs = rte_regs(regs); + int fsize = frame_extra_sizes(tregs->format); + int err = 0, sig = ksig->sig; + + if (fsize < 0) { + pr_debug("setup_frame: Unknown frame format %#x\n", + regs->format); + return -EFAULT; + } + + frame = get_sigframe(ksig, tregs, sizeof(*frame)); + + if (fsize) + err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize); + + 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, &ksig->info); + + /* Create the ucontext. */ + err |= __put_user(0, &frame->uc.uc_flags); + err |= __put_user(NULL, &frame->uc.uc_link); + err |= __save_altstack(&frame->uc.uc_stack, rdusp()); + err |= rt_setup_ucontext(&frame->uc, regs); + err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set)); + + /* Set up to return from userspace. */ +#ifdef CONFIG_MMU + err |= __put_user(frame->retcode, &frame->pretcode); +#ifdef __mcoldfire__ + /* movel #__NR_rt_sigreturn,d0; trap #0 */ + err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0)); + err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16), + (long __user *)(frame->retcode + 4)); +#else + /* moveq #,d0; notb d0; trap #0 */ + err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16), + (long __user *)(frame->retcode + 0)); + err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4)); +#endif +#else + err |= __put_user((long) ret_from_user_rt_signal, + (long __user *) &frame->pretcode); +#endif /* CONFIG_MMU */ + + if (err) + return -EFAULT; + + push_cache ((unsigned long) &frame->retcode); + + /* + * This is subtle; if we build more than one sigframe, all but the + * first one will see frame format 0 and have fsize == 0, so we won't + * screw stkadj. + */ + if (fsize) { + regs->stkadj = fsize; + tregs = rte_regs(regs); + pr_debug("Performing stackadjust=%04lx\n", regs->stkadj); + tregs->vector = 0; + tregs->format = 0; + tregs->sr = regs->sr; + } + + /* + * Set up registers for signal handler. All the state we are about + * to destroy is successfully copied to sigframe. + */ + wrusp ((unsigned long) frame); + tregs->pc = (unsigned long) ksig->ka.sa.sa_handler; + adjustformat(regs); + return 0; +} + +static inline void +handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler) +{ + switch (regs->d0) { + case -ERESTARTNOHAND: + if (!has_handler) + goto do_restart; + regs->d0 = -EINTR; + break; + + case -ERESTART_RESTARTBLOCK: + if (!has_handler) { + regs->d0 = __NR_restart_syscall; + regs->pc -= 2; + break; + } + regs->d0 = -EINTR; + break; + + case -ERESTARTSYS: + if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) { + regs->d0 = -EINTR; + break; + } + fallthrough; + case -ERESTARTNOINTR: + do_restart: + regs->d0 = regs->orig_d0; + regs->pc -= 2; + break; + } +} + +/* + * OK, we're invoking a handler + */ +static void +handle_signal(struct ksignal *ksig, struct pt_regs *regs) +{ + sigset_t *oldset = sigmask_to_save(); + int err; + /* are we from a system call? */ + if (regs->orig_d0 >= 0) + /* If so, check system call restarting.. */ + handle_restart(regs, &ksig->ka, 1); + + /* set up the stack frame */ + if (ksig->ka.sa.sa_flags & SA_SIGINFO) + err = setup_rt_frame(ksig, oldset, regs); + else + err = setup_frame(ksig, oldset, regs); + + signal_setup_done(err, ksig, 0); + + if (test_thread_flag(TIF_DELAYED_TRACE)) { + regs->sr &= ~0x8000; + send_sig(SIGTRAP, current, 1); + } +} + +/* + * Note that 'init' is a special process: it doesn't get signals it doesn't + * want to handle. Thus you cannot kill init even with a SIGKILL even by + * mistake. + */ +static void do_signal(struct pt_regs *regs) +{ + struct ksignal ksig; + + current->thread.esp0 = (unsigned long) regs; + + if (get_signal(&ksig)) { + /* Whee! Actually deliver the signal. */ + handle_signal(&ksig, regs); + return; + } + + /* Did we come from a system call? */ + if (regs->orig_d0 >= 0) + /* Restart the system call - no handlers present */ + handle_restart(regs, NULL, 0); + + /* If there's no signal to deliver, we just restore the saved mask. */ + restore_saved_sigmask(); +} + +void do_notify_resume(struct pt_regs *regs) +{ + if (test_thread_flag(TIF_NOTIFY_SIGNAL) || + test_thread_flag(TIF_SIGPENDING)) + do_signal(regs); + + if (test_thread_flag(TIF_NOTIFY_RESUME)) + tracehook_notify_resume(regs); +} |