#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; struct pt_regs __user *regs; #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 */ |