diff options
Diffstat (limited to 'arch/mips/kernel/signal-common.h')
| -rw-r--r-- | arch/mips/kernel/signal-common.h | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/arch/mips/kernel/signal-common.h b/arch/mips/kernel/signal-common.h new file mode 100644 index 000000000000..f9234df53253 --- /dev/null +++ b/arch/mips/kernel/signal-common.h @@ -0,0 +1,137 @@ +/* + * 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. + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright (C) 1994 - 2000 Ralf Baechle + * Copyright (C) 1999, 2000 Silicon Graphics, Inc. + */ + +static inline int +setup_sigcontext(struct pt_regs *regs, struct sigcontext *sc) +{ + int err = 0; + + err |= __put_user(regs->cp0_epc, &sc->sc_pc); + err |= __put_user(regs->cp0_status, &sc->sc_status); + +#define save_gp_reg(i) do { \ + err |= __put_user(regs->regs[i], &sc->sc_regs[i]); \ +} while(0) + __put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2); + save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6); + save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10); + save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14); + save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18); + save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22); + save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26); + save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30); + save_gp_reg(31); +#undef save_gp_reg + + err |= __put_user(regs->hi, &sc->sc_mdhi); + err |= __put_user(regs->lo, &sc->sc_mdlo); + err |= __put_user(regs->cp0_cause, &sc->sc_cause); + err |= __put_user(regs->cp0_badvaddr, &sc->sc_badvaddr); + + err |= __put_user(!!used_math(), &sc->sc_used_math); + + if (!used_math()) + goto out; + + /* + * Save FPU state to signal context. Signal handler will "inherit" + * current FPU state. + */ + preempt_disable(); + + if (!is_fpu_owner()) { + own_fpu(); + restore_fp(current); + } + err |= save_fp_context(sc); + + preempt_enable(); + +out: + return err; +} + +static inline int +restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc) +{ + int err = 0; + unsigned int used_math; + + /* Always make any pending restarted system calls return -EINTR */ + current_thread_info()->restart_block.fn = do_no_restart_syscall; + + err |= __get_user(regs->cp0_epc, &sc->sc_pc); + err |= __get_user(regs->hi, &sc->sc_mdhi); + err |= __get_user(regs->lo, &sc->sc_mdlo); + +#define restore_gp_reg(i) do { \ + err |= __get_user(regs->regs[i], &sc->sc_regs[i]); \ +} while(0) + restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3); + restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6); + restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9); + restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12); + restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15); + restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18); + restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21); + restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24); + restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27); + restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30); + restore_gp_reg(31); +#undef restore_gp_reg + + err |= __get_user(used_math, &sc->sc_used_math); + conditional_used_math(used_math); + + preempt_disable(); + + if (used_math()) { + /* restore fpu context if we have used it before */ + own_fpu(); + err |= restore_fp_context(sc); + } else { + /* signal handler may have used FPU. Give it up. */ + lose_fpu(); + } + + preempt_enable(); + + return err; +} + +/* + * Determine which stack to use.. + */ +static inline void * +get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) +{ + unsigned long sp, almask; + + /* Default to using normal stack */ + sp = regs->regs[29]; + + /* + * FPU emulator may have it's own trampoline active just + * above the user stack, 16-bytes before the next lowest + * 16 byte boundary. Try to avoid trashing it. + */ + sp -= 32; + + /* This is the X/Open sanctioned signal stack switching. */ + if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0)) + sp = current->sas_ss_sp + current->sas_ss_size; + + if (PLAT_TRAMPOLINE_STUFF_LINE) + almask = ~(PLAT_TRAMPOLINE_STUFF_LINE - 1); + else + almask = ALMASK; + + return (void *)((sp - frame_size) & almask); +} |