diff options
Diffstat (limited to 'arch/parisc/kernel/signal32.h')
| -rw-r--r-- | arch/parisc/kernel/signal32.h | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/arch/parisc/kernel/signal32.h b/arch/parisc/kernel/signal32.h new file mode 100644 index 000000000..af51d4cce --- /dev/null +++ b/arch/parisc/kernel/signal32.h @@ -0,0 +1,91 @@ +/* + * Copyright (C) 2001 Matthew Wilcox <willy at parisc-linux.org> + * Copyright (C) 2003 Carlos O'Donell <carlos at parisc-linux.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#ifndef _PARISC64_KERNEL_SIGNAL32_H +#define _PARISC64_KERNEL_SIGNAL32_H + +#include <linux/compat.h> + +/* 32-bit ucontext as seen from an 64-bit kernel */ +struct compat_ucontext { + compat_uint_t uc_flags; + compat_uptr_t uc_link; + compat_stack_t uc_stack; /* struct compat_sigaltstack (12 bytes)*/ + /* FIXME: Pad out to get uc_mcontext to start at an 8-byte aligned boundary */ + compat_uint_t pad[1]; + struct compat_sigcontext uc_mcontext; + compat_sigset_t uc_sigmask; /* mask last for extensibility */ +}; + +/* ELF32 signal handling */ + +int copy_siginfo_to_user32 (compat_siginfo_t __user *to, const siginfo_t *from); +int copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from); + +/* In a deft move of uber-hackery, we decide to carry the top half of all + * 64-bit registers in a non-portable, non-ABI, hidden structure. + * Userspace can read the hidden structure if it *wants* but is never + * guaranteed to be in the same place. In fact the uc_sigmask from the + * ucontext_t structure may push the hidden register file downards + */ +struct compat_regfile { + /* Upper half of all the 64-bit registers that were truncated + on a copy to a 32-bit userspace */ + compat_int_t rf_gr[32]; + compat_int_t rf_iasq[2]; + compat_int_t rf_iaoq[2]; + compat_int_t rf_sar; +}; + +#define COMPAT_SIGRETURN_TRAMP 4 +#define COMPAT_SIGRESTARTBLOCK_TRAMP 5 +#define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + \ + COMPAT_SIGRESTARTBLOCK_TRAMP) + +struct compat_rt_sigframe { + /* XXX: Must match trampoline size in arch/parisc/kernel/signal.c + Secondary to that it must protect the ERESTART_RESTARTBLOCK + trampoline we left on the stack (we were bad and didn't + change sp so we could run really fast.) */ + compat_uint_t tramp[COMPAT_TRAMP_SIZE]; + compat_siginfo_t info; + struct compat_ucontext uc; + /* Hidden location of truncated registers, *must* be last. */ + struct compat_regfile regs; +}; + +/* + * The 32-bit ABI wants at least 48 bytes for a function call frame: + * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of + * which Linux/parisc uses is sp-20 for the saved return pointer...) + * Then, the stack pointer must be rounded to a cache line (64 bytes). + */ +#define SIGFRAME32 64 +#define FUNCTIONCALLFRAME32 48 +#define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32) + +void sigset_32to64(sigset_t *s64, compat_sigset_t *s32); +void sigset_64to32(compat_sigset_t *s32, sigset_t *s64); +long restore_sigcontext32(struct compat_sigcontext __user *sc, + struct compat_regfile __user *rf, + struct pt_regs *regs); +long setup_sigcontext32(struct compat_sigcontext __user *sc, + struct compat_regfile __user *rf, + struct pt_regs *regs, int in_syscall); + +#endif |