1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (C) 2001 Matthew Wilcox <willy at parisc-linux.org> 4 * Copyright (C) 2003 Carlos O'Donell <carlos at parisc-linux.org> 5 */ 6 #ifndef _PARISC64_KERNEL_SIGNAL32_H 7 #define _PARISC64_KERNEL_SIGNAL32_H 8 9 #include <linux/compat.h> 10 11 /* 32-bit ucontext as seen from an 64-bit kernel */ 12 struct compat_ucontext { 13 compat_uint_t uc_flags; 14 compat_uptr_t uc_link; 15 compat_stack_t uc_stack; /* struct compat_sigaltstack (12 bytes)*/ 16 /* FIXME: Pad out to get uc_mcontext to start at an 8-byte aligned boundary */ 17 compat_uint_t pad[1]; 18 struct compat_sigcontext uc_mcontext; 19 compat_sigset_t uc_sigmask; /* mask last for extensibility */ 20 }; 21 22 /* ELF32 signal handling */ 23 24 /* In a deft move of uber-hackery, we decide to carry the top half of all 25 * 64-bit registers in a non-portable, non-ABI, hidden structure. 26 * Userspace can read the hidden structure if it *wants* but is never 27 * guaranteed to be in the same place. In fact the uc_sigmask from the 28 * ucontext_t structure may push the hidden register file downards 29 */ 30 struct compat_regfile { 31 /* Upper half of all the 64-bit registers that were truncated 32 on a copy to a 32-bit userspace */ 33 compat_int_t rf_gr[32]; 34 compat_int_t rf_iasq[2]; 35 compat_int_t rf_iaoq[2]; 36 compat_int_t rf_sar; 37 }; 38 39 #define COMPAT_SIGRETURN_TRAMP 3 40 #define COMPAT_SIGRESTARTBLOCK_TRAMP 5 41 #define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + \ 42 COMPAT_SIGRESTARTBLOCK_TRAMP) 43 44 struct compat_rt_sigframe { 45 /* XXX: Must match trampoline size in arch/parisc/kernel/signal.c 46 Secondary to that it must protect the ERESTART_RESTARTBLOCK 47 trampoline we left on the stack (we were bad and didn't 48 change sp so we could run really fast.) */ 49 compat_uint_t tramp[COMPAT_TRAMP_SIZE]; 50 compat_siginfo_t info; 51 struct compat_ucontext uc; 52 /* Hidden location of truncated registers, *must* be last. */ 53 struct compat_regfile regs; 54 }; 55 56 /* 57 * The 32-bit ABI wants at least 48 bytes for a function call frame: 58 * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of 59 * which Linux/parisc uses is sp-20 for the saved return pointer...) 60 * Then, the stack pointer must be rounded to a cache line (64 bytes). 61 */ 62 #define SIGFRAME32 64 63 #define FUNCTIONCALLFRAME32 48 64 #define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32) 65 66 long restore_sigcontext32(struct compat_sigcontext __user *sc, 67 struct compat_regfile __user *rf, 68 struct pt_regs *regs); 69 long setup_sigcontext32(struct compat_sigcontext __user *sc, 70 struct compat_regfile __user *rf, 71 struct pt_regs *regs, int in_syscall); 72 73 #endif 74