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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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22a3d03d69
My recent patch to split pt_regs between user and kernel missed
the usage in struct sigcontext.
Because this is a user visible struct it should be using the user
visible definition, which when we're building for the kernel is called
struct user_pt_regs.
As far as I can see this hasn't actually caused a bug (yet), because
we don't use the sizeof() the sigcontext->regs anywhere. But we should
still fix it to avoid confusion and future bugs.
Fixes: 002af9391b ("powerpc: Split user/kernel definitions of struct pt_regs")
Reported-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
93 lines
4.3 KiB
C
93 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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#ifndef _ASM_POWERPC_SIGCONTEXT_H
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#define _ASM_POWERPC_SIGCONTEXT_H
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/compiler.h>
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#include <asm/ptrace.h>
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#ifdef __powerpc64__
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#include <asm/elf.h>
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#endif
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struct sigcontext {
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unsigned long _unused[4];
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int signal;
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#ifdef __powerpc64__
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int _pad0;
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#endif
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unsigned long handler;
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unsigned long oldmask;
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#ifdef __KERNEL__
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struct user_pt_regs __user *regs;
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#else
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struct pt_regs *regs;
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#endif
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#ifdef __powerpc64__
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elf_gregset_t gp_regs;
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elf_fpregset_t fp_regs;
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/*
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* To maintain compatibility with current implementations the sigcontext is
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* extended by appending a pointer (v_regs) to a quadword type (elf_vrreg_t)
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* followed by an unstructured (vmx_reserve) field of 101 doublewords. This
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* allows the array of vector registers to be quadword aligned independent of
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* the alignment of the containing sigcontext or ucontext. It is the
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* responsibility of the code setting the sigcontext to set this pointer to
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* either NULL (if this processor does not support the VMX feature) or the
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* address of the first quadword within the allocated (vmx_reserve) area.
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*
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* The pointer (v_regs) of vector type (elf_vrreg_t) is type compatible with
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* an array of 34 quadword entries (elf_vrregset_t). The entries with
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* indexes 0-31 contain the corresponding vector registers. The entry with
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* index 32 contains the vscr as the last word (offset 12) within the
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* quadword. This allows the vscr to be stored as either a quadword (since
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* it must be copied via a vector register to/from storage) or as a word.
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* The entry with index 33 contains the vrsave as the first word (offset 0)
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* within the quadword.
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*
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* Part of the VSX data is stored here also by extending vmx_restore
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* by an additional 32 double words. Architecturally the layout of
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* the VSR registers and how they overlap on top of the legacy FPR and
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* VR registers is shown below:
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*
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* VSR doubleword 0 VSR doubleword 1
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* ----------------------------------------------------------------
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* VSR[0] | FPR[0] | |
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* ----------------------------------------------------------------
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* VSR[1] | FPR[1] | |
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* ----------------------------------------------------------------
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* | ... | |
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* | ... | |
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* ----------------------------------------------------------------
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* VSR[30] | FPR[30] | |
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* ----------------------------------------------------------------
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* VSR[31] | FPR[31] | |
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* ----------------------------------------------------------------
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* VSR[32] | VR[0] |
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* ----------------------------------------------------------------
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* VSR[33] | VR[1] |
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* ----------------------------------------------------------------
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* | ... |
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* | ... |
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* ----------------------------------------------------------------
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* VSR[62] | VR[30] |
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* ----------------------------------------------------------------
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* VSR[63] | VR[31] |
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* ----------------------------------------------------------------
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*
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* FPR/VSR 0-31 doubleword 0 is stored in fp_regs, and VMX/VSR 32-63
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* is stored at the start of vmx_reserve. vmx_reserve is extended for
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* backwards compatility to store VSR 0-31 doubleword 1 after the VMX
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* registers and vscr/vrsave.
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*/
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elf_vrreg_t __user *v_regs;
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long vmx_reserve[ELF_NVRREG + ELF_NVRREG + 1 + 32];
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#endif
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};
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#endif /* _ASM_POWERPC_SIGCONTEXT_H */
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