1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2 #ifndef _ASM_POWERPC_SIGCONTEXT_H
3 #define _ASM_POWERPC_SIGCONTEXT_H
4
5 /*
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11 #include <linux/compiler.h>
12 #include <asm/ptrace.h>
13 #ifdef __powerpc64__
14 #include <asm/elf.h>
15 #endif
16
17 struct sigcontext {
18 unsigned long _unused[4];
19 int signal;
20 #ifdef __powerpc64__
21 int _pad0;
22 #endif
23 unsigned long handler;
24 unsigned long oldmask;
25 #ifdef __KERNEL__
26 struct user_pt_regs __user *regs;
27 #else
28 struct pt_regs *regs;
29 #endif
30 #ifdef __powerpc64__
31 elf_gregset_t gp_regs;
32 elf_fpregset_t fp_regs;
33 /*
34 * To maintain compatibility with current implementations the sigcontext is
35 * extended by appending a pointer (v_regs) to a quadword type (elf_vrreg_t)
36 * followed by an unstructured (vmx_reserve) field of 101 doublewords. This
37 * allows the array of vector registers to be quadword aligned independent of
38 * the alignment of the containing sigcontext or ucontext. It is the
39 * responsibility of the code setting the sigcontext to set this pointer to
40 * either NULL (if this processor does not support the VMX feature) or the
41 * address of the first quadword within the allocated (vmx_reserve) area.
42 *
43 * The pointer (v_regs) of vector type (elf_vrreg_t) is type compatible with
44 * an array of 34 quadword entries (elf_vrregset_t). The entries with
45 * indexes 0-31 contain the corresponding vector registers. The entry with
46 * index 32 contains the vscr as the last word (offset 12) within the
47 * quadword. This allows the vscr to be stored as either a quadword (since
48 * it must be copied via a vector register to/from storage) or as a word.
49 * The entry with index 33 contains the vrsave as the first word (offset 0)
50 * within the quadword.
51 *
52 * Part of the VSX data is stored here also by extending vmx_restore
53 * by an additional 32 double words. Architecturally the layout of
54 * the VSR registers and how they overlap on top of the legacy FPR and
55 * VR registers is shown below:
56 *
57 * VSR doubleword 0 VSR doubleword 1
58 * ----------------------------------------------------------------
59 * VSR[0] | FPR[0] | |
60 * ----------------------------------------------------------------
61 * VSR[1] | FPR[1] | |
62 * ----------------------------------------------------------------
63 * | ... | |
64 * | ... | |
65 * ----------------------------------------------------------------
66 * VSR[30] | FPR[30] | |
67 * ----------------------------------------------------------------
68 * VSR[31] | FPR[31] | |
69 * ----------------------------------------------------------------
70 * VSR[32] | VR[0] |
71 * ----------------------------------------------------------------
72 * VSR[33] | VR[1] |
73 * ----------------------------------------------------------------
74 * | ... |
75 * | ... |
76 * ----------------------------------------------------------------
77 * VSR[62] | VR[30] |
78 * ----------------------------------------------------------------
79 * VSR[63] | VR[31] |
80 * ----------------------------------------------------------------
81 *
82 * FPR/VSR 0-31 doubleword 0 is stored in fp_regs, and VMX/VSR 32-63
83 * is stored at the start of vmx_reserve. vmx_reserve is extended for
84 * backwards compatility to store VSR 0-31 doubleword 1 after the VMX
85 * registers and vscr/vrsave.
86 */
87 elf_vrreg_t __user *v_regs;
88 long vmx_reserve[ELF_NVRREG + ELF_NVRREG + 1 + 32];
89 #endif
90 };
91
92 #endif /* _ASM_POWERPC_SIGCONTEXT_H */