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 /* In a deft move of uber-hackery, we decide to carry the top half of all 38 * 64-bit registers in a non-portable, non-ABI, hidden structure. 39 * Userspace can read the hidden structure if it *wants* but is never 40 * guaranteed to be in the same place. In fact the uc_sigmask from the 41 * ucontext_t structure may push the hidden register file downards 42 */ 43 struct compat_regfile { 44 /* Upper half of all the 64-bit registers that were truncated 45 on a copy to a 32-bit userspace */ 46 compat_int_t rf_gr[32]; 47 compat_int_t rf_iasq[2]; 48 compat_int_t rf_iaoq[2]; 49 compat_int_t rf_sar; 50 }; 51 52 #define COMPAT_SIGRETURN_TRAMP 4 53 #define COMPAT_SIGRESTARTBLOCK_TRAMP 5 54 #define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + \ 55 COMPAT_SIGRESTARTBLOCK_TRAMP) 56 57 struct compat_rt_sigframe { 58 /* XXX: Must match trampoline size in arch/parisc/kernel/signal.c 59 Secondary to that it must protect the ERESTART_RESTARTBLOCK 60 trampoline we left on the stack (we were bad and didn't 61 change sp so we could run really fast.) */ 62 compat_uint_t tramp[COMPAT_TRAMP_SIZE]; 63 compat_siginfo_t info; 64 struct compat_ucontext uc; 65 /* Hidden location of truncated registers, *must* be last. */ 66 struct compat_regfile regs; 67 }; 68 69 /* 70 * The 32-bit ABI wants at least 48 bytes for a function call frame: 71 * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of 72 * which Linux/parisc uses is sp-20 for the saved return pointer...) 73 * Then, the stack pointer must be rounded to a cache line (64 bytes). 74 */ 75 #define SIGFRAME32 64 76 #define FUNCTIONCALLFRAME32 48 77 #define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32) 78 79 long restore_sigcontext32(struct compat_sigcontext __user *sc, 80 struct compat_regfile __user *rf, 81 struct pt_regs *regs); 82 long setup_sigcontext32(struct compat_sigcontext __user *sc, 83 struct compat_regfile __user *rf, 84 struct pt_regs *regs, int in_syscall); 85 86 #endif 87