| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 */ |