From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 12:05:51 +0200 Subject: Adding upstream version 5.10.209. Signed-off-by: Daniel Baumann --- arch/parisc/kernel/signal32.h | 73 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 arch/parisc/kernel/signal32.h (limited to 'arch/parisc/kernel/signal32.h') diff --git a/arch/parisc/kernel/signal32.h b/arch/parisc/kernel/signal32.h new file mode 100644 index 000000000..f166250f2 --- /dev/null +++ b/arch/parisc/kernel/signal32.h @@ -0,0 +1,73 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2001 Matthew Wilcox + * Copyright (C) 2003 Carlos O'Donell + */ +#ifndef _PARISC64_KERNEL_SIGNAL32_H +#define _PARISC64_KERNEL_SIGNAL32_H + +#include + +/* 32-bit ucontext as seen from an 64-bit kernel */ +struct compat_ucontext { + compat_uint_t uc_flags; + compat_uptr_t uc_link; + compat_stack_t uc_stack; /* struct compat_sigaltstack (12 bytes)*/ + /* FIXME: Pad out to get uc_mcontext to start at an 8-byte aligned boundary */ + compat_uint_t pad[1]; + struct compat_sigcontext uc_mcontext; + compat_sigset_t uc_sigmask; /* mask last for extensibility */ +}; + +/* ELF32 signal handling */ + +/* In a deft move of uber-hackery, we decide to carry the top half of all + * 64-bit registers in a non-portable, non-ABI, hidden structure. + * Userspace can read the hidden structure if it *wants* but is never + * guaranteed to be in the same place. In fact the uc_sigmask from the + * ucontext_t structure may push the hidden register file downards + */ +struct compat_regfile { + /* Upper half of all the 64-bit registers that were truncated + on a copy to a 32-bit userspace */ + compat_int_t rf_gr[32]; + compat_int_t rf_iasq[2]; + compat_int_t rf_iaoq[2]; + compat_int_t rf_sar; +}; + +#define COMPAT_SIGRETURN_TRAMP 4 +#define COMPAT_SIGRESTARTBLOCK_TRAMP 5 +#define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + \ + COMPAT_SIGRESTARTBLOCK_TRAMP) + +struct compat_rt_sigframe { + /* XXX: Must match trampoline size in arch/parisc/kernel/signal.c + Secondary to that it must protect the ERESTART_RESTARTBLOCK + trampoline we left on the stack (we were bad and didn't + change sp so we could run really fast.) */ + compat_uint_t tramp[COMPAT_TRAMP_SIZE]; + compat_siginfo_t info; + struct compat_ucontext uc; + /* Hidden location of truncated registers, *must* be last. */ + struct compat_regfile regs; +}; + +/* + * The 32-bit ABI wants at least 48 bytes for a function call frame: + * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of + * which Linux/parisc uses is sp-20 for the saved return pointer...) + * Then, the stack pointer must be rounded to a cache line (64 bytes). + */ +#define SIGFRAME32 64 +#define FUNCTIONCALLFRAME32 48 +#define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32) + +long restore_sigcontext32(struct compat_sigcontext __user *sc, + struct compat_regfile __user *rf, + struct pt_regs *regs); +long setup_sigcontext32(struct compat_sigcontext __user *sc, + struct compat_regfile __user *rf, + struct pt_regs *regs, int in_syscall); + +#endif -- cgit v1.2.3