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73 lines
2.8 KiB
73 lines
2.8 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* Copyright (C) 2001 Matthew Wilcox <willy at parisc-linux.org> |
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* Copyright (C) 2003 Carlos O'Donell <carlos at parisc-linux.org> |
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*/ |
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#ifndef _PARISC64_KERNEL_SIGNAL32_H |
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#define _PARISC64_KERNEL_SIGNAL32_H |
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#include <linux/compat.h> |
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/* 32-bit ucontext as seen from an 64-bit kernel */ |
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struct compat_ucontext { |
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compat_uint_t uc_flags; |
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compat_uptr_t uc_link; |
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compat_stack_t uc_stack; /* struct compat_sigaltstack (12 bytes)*/ |
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/* FIXME: Pad out to get uc_mcontext to start at an 8-byte aligned boundary */ |
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compat_uint_t pad[1]; |
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struct compat_sigcontext uc_mcontext; |
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compat_sigset_t uc_sigmask; /* mask last for extensibility */ |
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}; |
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/* ELF32 signal handling */ |
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/* In a deft move of uber-hackery, we decide to carry the top half of all |
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* 64-bit registers in a non-portable, non-ABI, hidden structure. |
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* Userspace can read the hidden structure if it *wants* but is never |
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* guaranteed to be in the same place. In fact the uc_sigmask from the |
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* ucontext_t structure may push the hidden register file downards |
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*/ |
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struct compat_regfile { |
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/* Upper half of all the 64-bit registers that were truncated |
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on a copy to a 32-bit userspace */ |
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compat_int_t rf_gr[32]; |
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compat_int_t rf_iasq[2]; |
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compat_int_t rf_iaoq[2]; |
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compat_int_t rf_sar; |
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}; |
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#define COMPAT_SIGRETURN_TRAMP 4 |
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#define COMPAT_SIGRESTARTBLOCK_TRAMP 5 |
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#define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + \ |
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COMPAT_SIGRESTARTBLOCK_TRAMP) |
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struct compat_rt_sigframe { |
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/* XXX: Must match trampoline size in arch/parisc/kernel/signal.c |
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Secondary to that it must protect the ERESTART_RESTARTBLOCK |
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trampoline we left on the stack (we were bad and didn't |
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change sp so we could run really fast.) */ |
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compat_uint_t tramp[COMPAT_TRAMP_SIZE]; |
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compat_siginfo_t info; |
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struct compat_ucontext uc; |
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/* Hidden location of truncated registers, *must* be last. */ |
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struct compat_regfile regs; |
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}; |
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/* |
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* The 32-bit ABI wants at least 48 bytes for a function call frame: |
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* 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of |
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* which Linux/parisc uses is sp-20 for the saved return pointer...) |
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* Then, the stack pointer must be rounded to a cache line (64 bytes). |
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*/ |
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#define SIGFRAME32 64 |
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#define FUNCTIONCALLFRAME32 48 |
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#define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32) |
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long restore_sigcontext32(struct compat_sigcontext __user *sc, |
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struct compat_regfile __user *rf, |
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struct pt_regs *regs); |
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long setup_sigcontext32(struct compat_sigcontext __user *sc, |
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struct compat_regfile __user *rf, |
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struct pt_regs *regs, int in_syscall); |
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#endif
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