1 /* 2 * Copyright (C) 2001 Matthew Wilcox <willy at parisc-linux.org> 3 * Copyright (C) 2003 Carlos O'Donell <carlos at parisc-linux.org> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 */ 19 #ifndef _PARISC64_KERNEL_SIGNAL32_H 20 #define _PARISC64_KERNEL_SIGNAL32_H 21 22 #include <linux/compat.h> 23 24 /* 32-bit ucontext as seen from an 64-bit kernel */ 25 struct compat_ucontext { 26 compat_uint_t uc_flags; 27 compat_uptr_t uc_link; 28 compat_stack_t uc_stack; /* struct compat_sigaltstack (12 bytes)*/ 29 /* FIXME: Pad out to get uc_mcontext to start at an 8-byte aligned boundary */ 30 compat_uint_t pad[1]; 31 struct compat_sigcontext uc_mcontext; 32 compat_sigset_t uc_sigmask; /* mask last for extensibility */ 33 }; 34 35 /* ELF32 signal handling */ 36 37 int copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from); 38 int copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from); 39 40 /* In a deft move of uber-hackery, we decide to carry the top half of all 41 * 64-bit registers in a non-portable, non-ABI, hidden structure. 42 * Userspace can read the hidden structure if it *wants* but is never 43 * guaranteed to be in the same place. In fact the uc_sigmask from the 44 * ucontext_t structure may push the hidden register file downards 45 */ 46 struct compat_regfile { 47 /* Upper half of all the 64-bit registers that were truncated 48 on a copy to a 32-bit userspace */ 49 compat_int_t rf_gr[32]; 50 compat_int_t rf_iasq[2]; 51 compat_int_t rf_iaoq[2]; 52 compat_int_t rf_sar; 53 }; 54 55 #define COMPAT_SIGRETURN_TRAMP 4 56 #define COMPAT_SIGRESTARTBLOCK_TRAMP 5 57 #define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + \ 58 COMPAT_SIGRESTARTBLOCK_TRAMP) 59 60 struct compat_rt_sigframe { 61 /* XXX: Must match trampoline size in arch/parisc/kernel/signal.c 62 Secondary to that it must protect the ERESTART_RESTARTBLOCK 63 trampoline we left on the stack (we were bad and didn't 64 change sp so we could run really fast.) */ 65 compat_uint_t tramp[COMPAT_TRAMP_SIZE]; 66 compat_siginfo_t info; 67 struct compat_ucontext uc; 68 /* Hidden location of truncated registers, *must* be last. */ 69 struct compat_regfile regs; 70 }; 71 72 /* 73 * The 32-bit ABI wants at least 48 bytes for a function call frame: 74 * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of 75 * which Linux/parisc uses is sp-20 for the saved return pointer...) 76 * Then, the stack pointer must be rounded to a cache line (64 bytes). 77 */ 78 #define SIGFRAME32 64 79 #define FUNCTIONCALLFRAME32 48 80 #define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32) 81 82 void sigset_32to64(sigset_t *s64, compat_sigset_t *s32); 83 void sigset_64to32(compat_sigset_t *s32, sigset_t *s64); 84 long restore_sigcontext32(struct compat_sigcontext __user *sc, 85 struct compat_regfile __user *rf, 86 struct pt_regs *regs); 87 long setup_sigcontext32(struct compat_sigcontext __user *sc, 88 struct compat_regfile __user *rf, 89 struct pt_regs *regs, int in_syscall); 90 91 #endif 92