mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 05:25:20 +07:00
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 */
|
|
#ifndef _ASM_POWERPC_SIGCONTEXT_H
|
|
#define _ASM_POWERPC_SIGCONTEXT_H
|
|
|
|
/*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
#include <linux/compiler.h>
|
|
#include <asm/ptrace.h>
|
|
#ifdef __powerpc64__
|
|
#include <asm/elf.h>
|
|
#endif
|
|
|
|
struct sigcontext {
|
|
unsigned long _unused[4];
|
|
int signal;
|
|
#ifdef __powerpc64__
|
|
int _pad0;
|
|
#endif
|
|
unsigned long handler;
|
|
unsigned long oldmask;
|
|
#ifdef __KERNEL__
|
|
struct user_pt_regs __user *regs;
|
|
#else
|
|
struct pt_regs *regs;
|
|
#endif
|
|
#ifdef __powerpc64__
|
|
elf_gregset_t gp_regs;
|
|
elf_fpregset_t fp_regs;
|
|
/*
|
|
* To maintain compatibility with current implementations the sigcontext is
|
|
* extended by appending a pointer (v_regs) to a quadword type (elf_vrreg_t)
|
|
* followed by an unstructured (vmx_reserve) field of 101 doublewords. This
|
|
* allows the array of vector registers to be quadword aligned independent of
|
|
* the alignment of the containing sigcontext or ucontext. It is the
|
|
* responsibility of the code setting the sigcontext to set this pointer to
|
|
* either NULL (if this processor does not support the VMX feature) or the
|
|
* address of the first quadword within the allocated (vmx_reserve) area.
|
|
*
|
|
* The pointer (v_regs) of vector type (elf_vrreg_t) is type compatible with
|
|
* an array of 34 quadword entries (elf_vrregset_t). The entries with
|
|
* indexes 0-31 contain the corresponding vector registers. The entry with
|
|
* index 32 contains the vscr as the last word (offset 12) within the
|
|
* quadword. This allows the vscr to be stored as either a quadword (since
|
|
* it must be copied via a vector register to/from storage) or as a word.
|
|
* The entry with index 33 contains the vrsave as the first word (offset 0)
|
|
* within the quadword.
|
|
*
|
|
* Part of the VSX data is stored here also by extending vmx_restore
|
|
* by an additional 32 double words. Architecturally the layout of
|
|
* the VSR registers and how they overlap on top of the legacy FPR and
|
|
* VR registers is shown below:
|
|
*
|
|
* VSR doubleword 0 VSR doubleword 1
|
|
* ----------------------------------------------------------------
|
|
* VSR[0] | FPR[0] | |
|
|
* ----------------------------------------------------------------
|
|
* VSR[1] | FPR[1] | |
|
|
* ----------------------------------------------------------------
|
|
* | ... | |
|
|
* | ... | |
|
|
* ----------------------------------------------------------------
|
|
* VSR[30] | FPR[30] | |
|
|
* ----------------------------------------------------------------
|
|
* VSR[31] | FPR[31] | |
|
|
* ----------------------------------------------------------------
|
|
* VSR[32] | VR[0] |
|
|
* ----------------------------------------------------------------
|
|
* VSR[33] | VR[1] |
|
|
* ----------------------------------------------------------------
|
|
* | ... |
|
|
* | ... |
|
|
* ----------------------------------------------------------------
|
|
* VSR[62] | VR[30] |
|
|
* ----------------------------------------------------------------
|
|
* VSR[63] | VR[31] |
|
|
* ----------------------------------------------------------------
|
|
*
|
|
* FPR/VSR 0-31 doubleword 0 is stored in fp_regs, and VMX/VSR 32-63
|
|
* is stored at the start of vmx_reserve. vmx_reserve is extended for
|
|
* backwards compatility to store VSR 0-31 doubleword 1 after the VMX
|
|
* registers and vscr/vrsave.
|
|
*/
|
|
elf_vrreg_t __user *v_regs;
|
|
long vmx_reserve[ELF_NVRREG + ELF_NVRREG + 1 + 32];
|
|
#endif
|
|
};
|
|
|
|
#endif /* _ASM_POWERPC_SIGCONTEXT_H */
|