| #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 69 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+32+1]; |
| #endif |
| }; |
| |
| #endif /* _ASM_POWERPC_SIGCONTEXT_H */ |
