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115 lines
3.0 KiB
115 lines
3.0 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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#include <linux/regset.h> |
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#include <linux/elf.h> |
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#include <asm/switch_to.h> |
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#include "ptrace-decl.h" |
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/* |
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* Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go. |
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* The transfer totals 34 quadword. Quadwords 0-31 contain the |
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* corresponding vector registers. Quadword 32 contains the vscr as the |
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* last word (offset 12) within that quadword. Quadword 33 contains the |
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* vrsave as the first word (offset 0) within the quadword. |
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* |
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* This definition of the VMX state is compatible with the current PPC32 |
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* ptrace interface. This allows signal handling and ptrace to use the |
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* same structures. This also simplifies the implementation of a bi-arch |
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* (combined (32- and 64-bit) gdb. |
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*/ |
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int vr_active(struct task_struct *target, const struct user_regset *regset) |
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{ |
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flush_altivec_to_thread(target); |
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return target->thread.used_vr ? regset->n : 0; |
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} |
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/* |
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* Regardless of transactions, 'vr_state' holds the current running |
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* value of all the VMX registers and 'ckvr_state' holds the last |
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* checkpointed value of all the VMX registers for the current |
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* transaction to fall back on in case it aborts. |
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* |
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* Userspace interface buffer layout: |
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* |
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* struct data { |
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* vector128 vr[32]; |
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* vector128 vscr; |
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* vector128 vrsave; |
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* }; |
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*/ |
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int vr_get(struct task_struct *target, const struct user_regset *regset, |
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struct membuf to) |
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{ |
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union { |
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elf_vrreg_t reg; |
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u32 word; |
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} vrsave; |
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flush_altivec_to_thread(target); |
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BUILD_BUG_ON(offsetof(struct thread_vr_state, vscr) != |
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offsetof(struct thread_vr_state, vr[32])); |
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membuf_write(&to, &target->thread.vr_state, 33 * sizeof(vector128)); |
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/* |
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* Copy out only the low-order word of vrsave. |
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*/ |
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memset(&vrsave, 0, sizeof(vrsave)); |
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vrsave.word = target->thread.vrsave; |
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return membuf_write(&to, &vrsave, sizeof(vrsave)); |
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} |
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/* |
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* Regardless of transactions, 'vr_state' holds the current running |
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* value of all the VMX registers and 'ckvr_state' holds the last |
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* checkpointed value of all the VMX registers for the current |
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* transaction to fall back on in case it aborts. |
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* |
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* Userspace interface buffer layout: |
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* |
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* struct data { |
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* vector128 vr[32]; |
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* vector128 vscr; |
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* vector128 vrsave; |
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* }; |
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*/ |
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int vr_set(struct task_struct *target, const struct user_regset *regset, |
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unsigned int pos, unsigned int count, |
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const void *kbuf, const void __user *ubuf) |
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{ |
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int ret; |
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flush_altivec_to_thread(target); |
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BUILD_BUG_ON(offsetof(struct thread_vr_state, vscr) != |
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offsetof(struct thread_vr_state, vr[32])); |
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
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&target->thread.vr_state, 0, |
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33 * sizeof(vector128)); |
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if (!ret && count > 0) { |
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/* |
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* We use only the first word of vrsave. |
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*/ |
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int start, end; |
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union { |
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elf_vrreg_t reg; |
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u32 word; |
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} vrsave; |
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memset(&vrsave, 0, sizeof(vrsave)); |
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vrsave.word = target->thread.vrsave; |
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start = 33 * sizeof(vector128); |
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end = start + sizeof(vrsave); |
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &vrsave, |
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start, end); |
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if (!ret) |
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target->thread.vrsave = vrsave.word; |
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} |
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return ret; |
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}
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