| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
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| 2 | /* |
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| 3 | * Copyright (C) 2001 Matthew Wilcox <willy at parisc-linux.org> |
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| 4 | * Copyright (C) 2003 Carlos O'Donell <carlos at parisc-linux.org> |
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| 5 | */ |
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| 6 | #ifndef _PARISC64_KERNEL_SIGNAL32_H |
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| 7 | #define _PARISC64_KERNEL_SIGNAL32_H |
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| 8 | |
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| 9 | #include <linux/compat.h> |
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| 10 | |
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| 11 | /* 32-bit ucontext as seen from an 64-bit kernel */ |
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| 12 | struct compat_ucontext { |
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| 13 | compat_uint_t uc_flags; |
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| 14 | compat_uptr_t uc_link; |
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| 15 | compat_stack_t uc_stack; /* struct compat_sigaltstack (12 bytes)*/ |
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| 16 | /* FIXME: Pad out to get uc_mcontext to start at an 8-byte aligned boundary */ |
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| 17 | compat_uint_t pad[1]; |
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| 18 | struct compat_sigcontext uc_mcontext; |
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| 19 | compat_sigset_t uc_sigmask; /* mask last for extensibility */ |
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| 20 | }; |
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| 21 | |
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| 22 | /* ELF32 signal handling */ |
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| 23 | |
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| 24 | /* In a deft move of uber-hackery, we decide to carry the top half of all |
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| 25 | * 64-bit registers in a non-portable, non-ABI, hidden structure. |
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| 26 | * Userspace can read the hidden structure if it *wants* but is never |
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| 27 | * guaranteed to be in the same place. In fact the uc_sigmask from the |
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| 28 | * ucontext_t structure may push the hidden register file downards |
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| 29 | */ |
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| 30 | struct compat_regfile { |
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| 31 | /* Upper half of all the 64-bit registers that were truncated |
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| 32 | on a copy to a 32-bit userspace */ |
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| 33 | compat_int_t rf_gr[32]; |
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| 34 | compat_int_t rf_iasq[2]; |
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| 35 | compat_int_t rf_iaoq[2]; |
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| 36 | compat_int_t rf_sar; |
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| 37 | }; |
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| 38 | |
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| 39 | struct compat_rt_sigframe { |
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| 40 | unsigned int tramp[2]; /* holds original return address */ |
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| 41 | compat_siginfo_t info; |
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| 42 | struct compat_ucontext uc; |
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| 43 | /* Hidden location of truncated registers, *must* be last. */ |
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| 44 | struct compat_regfile regs; |
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| 45 | }; |
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| 46 | |
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| 47 | /* |
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| 48 | * The 32-bit ABI wants at least 48 bytes for a function call frame: |
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| 49 | * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of |
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| 50 | * which Linux/parisc uses is sp-20 for the saved return pointer...) |
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| 51 | * Then, the stack pointer must be rounded to a cache line (64 bytes). |
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| 52 | */ |
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| 53 | #define SIGFRAME32 64 |
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| 54 | #define FUNCTIONCALLFRAME32 48 |
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| 55 | #define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32) |
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| 56 | |
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| 57 | long restore_sigcontext32(struct compat_sigcontext __user *sc, |
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| 58 | struct compat_regfile __user *rf, |
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| 59 | struct pt_regs *regs); |
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| 60 | long setup_sigcontext32(struct compat_sigcontext __user *sc, |
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| 61 | struct compat_regfile __user *rf, |
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| 62 | struct pt_regs *regs, int in_syscall); |
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| 63 | |
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| 64 | #endif |
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| 65 | |
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