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 */ 93