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 typedef compat_uptr_t compat_sighandler_t; 25 26 typedef struct compat_sigaltstack { 27 compat_uptr_t ss_sp; 28 compat_int_t ss_flags; 29 compat_size_t ss_size; 30 } compat_stack_t; 31 32 /* Most things should be clean enough to redefine this at will, if care 33 is taken to make libc match. */ 34 35 struct compat_sigaction { 36 compat_sighandler_t sa_handler; 37 compat_uint_t sa_flags; 38 compat_sigset_t sa_mask; /* mask last for extensibility */ 39 }; 40 41 /* 32-bit ucontext as seen from an 64-bit kernel */ 42 struct compat_ucontext { 43 compat_uint_t uc_flags; 44 compat_uptr_t uc_link; 45 compat_stack_t uc_stack; /* struct compat_sigaltstack (12 bytes)*/ 46 /* FIXME: Pad out to get uc_mcontext to start at an 8-byte aligned boundary */ 47 compat_uint_t pad[1]; 48 struct compat_sigcontext uc_mcontext; 49 compat_sigset_t uc_sigmask; /* mask last for extensibility */ 50 }; 51 52 /* ELF32 signal handling */ 53 54 struct k_sigaction32 { 55 struct compat_sigaction sa; 56 }; 57 58 int copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from); 59 int copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from); 60 61 /* In a deft move of uber-hackery, we decide to carry the top half of all 62 * 64-bit registers in a non-portable, non-ABI, hidden structure. 63 * Userspace can read the hidden structure if it *wants* but is never 64 * guaranteed to be in the same place. In fact the uc_sigmask from the 65 * ucontext_t structure may push the hidden register file downards 66 */ 67 struct compat_regfile { 68 /* Upper half of all the 64-bit registers that were truncated 69 on a copy to a 32-bit userspace */ 70 compat_int_t rf_gr[32]; 71 compat_int_t rf_iasq[2]; 72 compat_int_t rf_iaoq[2]; 73 compat_int_t rf_sar; 74 }; 75 76 #define COMPAT_SIGRETURN_TRAMP 4 77 #define COMPAT_SIGRESTARTBLOCK_TRAMP 5 78 #define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + \ 79 COMPAT_SIGRESTARTBLOCK_TRAMP) 80 81 struct compat_rt_sigframe { 82 /* XXX: Must match trampoline size in arch/parisc/kernel/signal.c 83 Secondary to that it must protect the ERESTART_RESTARTBLOCK 84 trampoline we left on the stack (we were bad and didn't 85 change sp so we could run really fast.) */ 86 compat_uint_t tramp[COMPAT_TRAMP_SIZE]; 87 compat_siginfo_t info; 88 struct compat_ucontext uc; 89 /* Hidden location of truncated registers, *must* be last. */ 90 struct compat_regfile regs; 91 }; 92 93 /* 94 * The 32-bit ABI wants at least 48 bytes for a function call frame: 95 * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of 96 * which Linux/parisc uses is sp-20 for the saved return pointer...) 97 * Then, the stack pointer must be rounded to a cache line (64 bytes). 98 */ 99 #define SIGFRAME32 64 100 #define FUNCTIONCALLFRAME32 48 101 #define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32) 102 103 void sigset_32to64(sigset_t *s64, compat_sigset_t *s32); 104 void sigset_64to32(compat_sigset_t *s32, sigset_t *s64); 105 int do_sigaltstack32 (const compat_stack_t __user *uss32, 106 compat_stack_t __user *uoss32, unsigned long sp); 107 long restore_sigcontext32(struct compat_sigcontext __user *sc, 108 struct compat_regfile __user *rf, 109 struct pt_regs *regs); 110 long setup_sigcontext32(struct compat_sigcontext __user *sc, 111 struct compat_regfile __user *rf, 112 struct pt_regs *regs, int in_syscall); 113 114 #endif 115