116 lines
3.0 KiB
C
116 lines
3.0 KiB
C
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// 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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