--- zzzz-none-000/linux-3.10.107/arch/mips/kernel/signal32.c 2017-06-27 09:49:32.000000000 +0000 +++ scorpion-7490-727/linux-3.10.107/arch/mips/kernel/signal32.c 2021-02-04 17:41:59.000000000 +0000 @@ -31,20 +31,10 @@ #include #include #include -#include #include #include "signal-common.h" -static int (*save_fp_context32)(struct sigcontext32 __user *sc); -static int (*restore_fp_context32)(struct sigcontext32 __user *sc); - -extern asmlinkage int _save_fp_context32(struct sigcontext32 __user *sc); -extern asmlinkage int _restore_fp_context32(struct sigcontext32 __user *sc); - -extern asmlinkage int fpu_emulator_save_context32(struct sigcontext32 __user *sc); -extern asmlinkage int fpu_emulator_restore_context32(struct sigcontext32 __user *sc); - /* * Including would give use the 64-bit syscall numbers ... */ @@ -77,55 +67,11 @@ struct ucontext32 rs_uc; }; -/* - * sigcontext handlers - */ -static int protected_save_fp_context32(struct sigcontext32 __user *sc) -{ - int err; - while (1) { - lock_fpu_owner(); - own_fpu_inatomic(1); - err = save_fp_context32(sc); /* this might fail */ - unlock_fpu_owner(); - if (likely(!err)) - break; - /* touch the sigcontext and try again */ - err = __put_user(0, &sc->sc_fpregs[0]) | - __put_user(0, &sc->sc_fpregs[31]) | - __put_user(0, &sc->sc_fpc_csr); - if (err) - break; /* really bad sigcontext */ - } - return err; -} - -static int protected_restore_fp_context32(struct sigcontext32 __user *sc) -{ - int err, tmp __maybe_unused; - while (1) { - lock_fpu_owner(); - own_fpu_inatomic(0); - err = restore_fp_context32(sc); /* this might fail */ - unlock_fpu_owner(); - if (likely(!err)) - break; - /* touch the sigcontext and try again */ - err = __get_user(tmp, &sc->sc_fpregs[0]) | - __get_user(tmp, &sc->sc_fpregs[31]) | - __get_user(tmp, &sc->sc_fpc_csr); - if (err) - break; /* really bad sigcontext */ - } - return err; -} - static int setup_sigcontext32(struct pt_regs *regs, struct sigcontext32 __user *sc) { int err = 0; int i; - u32 used_math; err |= __put_user(regs->cp0_epc, &sc->sc_pc); @@ -145,41 +91,24 @@ err |= __put_user(mflo3(), &sc->sc_lo3); } - used_math = !!used_math(); - err |= __put_user(used_math, &sc->sc_used_math); + /* + * Save FPU state to signal context. Signal handler + * will "inherit" current FPU state. + */ + err |= protected_save_fp_context(sc); - if (used_math) { - /* - * Save FPU state to signal context. Signal handler - * will "inherit" current FPU state. - */ - err |= protected_save_fp_context32(sc); - } return err; } -static int -check_and_restore_fp_context32(struct sigcontext32 __user *sc) -{ - int err, sig; - - err = sig = fpcsr_pending(&sc->sc_fpc_csr); - if (err > 0) - err = 0; - err |= protected_restore_fp_context32(sc); - return err ?: sig; -} - static int restore_sigcontext32(struct pt_regs *regs, struct sigcontext32 __user *sc) { - u32 used_math; int err = 0; s32 treg; int i; /* Always make any pending restarted system calls return -EINTR */ - current_thread_info()->restart_block.fn = do_no_restart_syscall; + current->restart_block.fn = do_no_restart_syscall; err |= __get_user(regs->cp0_epc, &sc->sc_pc); err |= __get_user(regs->hi, &sc->sc_mdhi); @@ -197,70 +126,7 @@ for (i = 1; i < 32; i++) err |= __get_user(regs->regs[i], &sc->sc_regs[i]); - err |= __get_user(used_math, &sc->sc_used_math); - conditional_used_math(used_math); - - if (used_math) { - /* restore fpu context if we have used it before */ - if (!err) - err = check_and_restore_fp_context32(sc); - } else { - /* signal handler may have used FPU. Give it up. */ - lose_fpu(0); - } - - return err; -} - -/* - * - */ -extern void __put_sigset_unknown_nsig(void); -extern void __get_sigset_unknown_nsig(void); - -static inline int put_sigset(const sigset_t *kbuf, compat_sigset_t __user *ubuf) -{ - int err = 0; - - if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf))) - return -EFAULT; - - switch (_NSIG_WORDS) { - default: - __put_sigset_unknown_nsig(); - case 2: - err |= __put_user(kbuf->sig[1] >> 32, &ubuf->sig[3]); - err |= __put_user(kbuf->sig[1] & 0xffffffff, &ubuf->sig[2]); - case 1: - err |= __put_user(kbuf->sig[0] >> 32, &ubuf->sig[1]); - err |= __put_user(kbuf->sig[0] & 0xffffffff, &ubuf->sig[0]); - } - - return err; -} - -static inline int get_sigset(sigset_t *kbuf, const compat_sigset_t __user *ubuf) -{ - int err = 0; - unsigned long sig[4]; - - if (!access_ok(VERIFY_READ, ubuf, sizeof(*ubuf))) - return -EFAULT; - - switch (_NSIG_WORDS) { - default: - __get_sigset_unknown_nsig(); - case 2: - err |= __get_user(sig[3], &ubuf->sig[3]); - err |= __get_user(sig[2], &ubuf->sig[2]); - kbuf->sig[1] = sig[2] | (sig[3] << 32); - case 1: - err |= __get_user(sig[1], &ubuf->sig[1]); - err |= __get_user(sig[0], &ubuf->sig[0]); - kbuf->sig[0] = sig[0] | (sig[1] << 32); - } - - return err; + return err ?: protected_restore_fp_context(sc); } /* @@ -314,7 +180,7 @@ return ret; } -int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) +int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) { int err; @@ -447,21 +313,21 @@ force_sig(SIGSEGV, current); } -static int setup_frame_32(void *sig_return, struct k_sigaction *ka, - struct pt_regs *regs, int signr, sigset_t *set) +static int setup_frame_32(void *sig_return, struct ksignal *ksig, + struct pt_regs *regs, sigset_t *set) { struct sigframe32 __user *frame; int err = 0; - frame = get_sigframe(ka, regs, sizeof(*frame)); + frame = get_sigframe(ksig, regs, sizeof(*frame)); if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) - goto give_sigsegv; + return -EFAULT; err |= setup_sigcontext32(regs, &frame->sf_sc); err |= __copy_conv_sigset_to_user(&frame->sf_mask, set); if (err) - goto give_sigsegv; + return -EFAULT; /* * Arguments to signal handler: @@ -473,37 +339,32 @@ * $25 and c0_epc point to the signal handler, $29 points to the * struct sigframe. */ - regs->regs[ 4] = signr; + regs->regs[ 4] = ksig->sig; regs->regs[ 5] = 0; regs->regs[ 6] = (unsigned long) &frame->sf_sc; regs->regs[29] = (unsigned long) frame; regs->regs[31] = (unsigned long) sig_return; - regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; + regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", current->comm, current->pid, frame, regs->cp0_epc, regs->regs[31]); return 0; - -give_sigsegv: - force_sigsegv(signr, current); - return -EFAULT; } -static int setup_rt_frame_32(void *sig_return, struct k_sigaction *ka, - struct pt_regs *regs, int signr, sigset_t *set, - siginfo_t *info) +static int setup_rt_frame_32(void *sig_return, struct ksignal *ksig, + struct pt_regs *regs, sigset_t *set) { struct rt_sigframe32 __user *frame; int err = 0; - frame = get_sigframe(ka, regs, sizeof(*frame)); + frame = get_sigframe(ksig, regs, sizeof(*frame)); if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) - goto give_sigsegv; + return -EFAULT; /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */ - err |= copy_siginfo_to_user32(&frame->rs_info, info); + err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info); /* Create the ucontext. */ err |= __put_user(0, &frame->rs_uc.uc_flags); @@ -513,7 +374,7 @@ err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set); if (err) - goto give_sigsegv; + return -EFAULT; /* * Arguments to signal handler: @@ -525,22 +386,18 @@ * $25 and c0_epc point to the signal handler, $29 points to * the struct rt_sigframe32. */ - regs->regs[ 4] = signr; + regs->regs[ 4] = ksig->sig; regs->regs[ 5] = (unsigned long) &frame->rs_info; regs->regs[ 6] = (unsigned long) &frame->rs_uc; regs->regs[29] = (unsigned long) frame; regs->regs[31] = (unsigned long) sig_return; - regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; + regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", current->comm, current->pid, frame, regs->cp0_epc, regs->regs[31]); return 0; - -give_sigsegv: - force_sigsegv(signr, current); - return -EFAULT; } /* @@ -548,25 +405,12 @@ */ struct mips_abi mips_abi_32 = { .setup_frame = setup_frame_32, - .signal_return_offset = - offsetof(struct mips_vdso, o32_signal_trampoline), .setup_rt_frame = setup_rt_frame_32, - .rt_signal_return_offset = - offsetof(struct mips_vdso, o32_rt_signal_trampoline), - .restart = __NR_O32_restart_syscall -}; - -static int signal32_init(void) -{ - if (cpu_has_fpu) { - save_fp_context32 = _save_fp_context32; - restore_fp_context32 = _restore_fp_context32; - } else { - save_fp_context32 = fpu_emulator_save_context32; - restore_fp_context32 = fpu_emulator_restore_context32; - } + .restart = __NR_O32_restart_syscall, - return 0; -} + .off_sc_fpregs = offsetof(struct sigcontext32, sc_fpregs), + .off_sc_fpc_csr = offsetof(struct sigcontext32, sc_fpc_csr), + .off_sc_used_math = offsetof(struct sigcontext32, sc_used_math), -arch_initcall(signal32_init); + .vdso = &vdso_image_o32, +};