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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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47e12855a9
Note: compat variant of REGSET_TM_CGPR is almost certainly wrong; it claims to be 48*64bit, but just as compat REGSET_GPR it stores 44*32bit of (truncated) registers + 4 32bit zeros... followed by 48 more 32bit zeroes. Might be too late to change - it's a userland ABI, after all ;-/ Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/regset.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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* For get_evrregs/set_evrregs functions 'data' has the following layout:
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*
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* struct {
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* u32 evr[32];
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* u64 acc;
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* u32 spefscr;
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* }
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*/
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int evr_active(struct task_struct *target, const struct user_regset *regset)
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{
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flush_spe_to_thread(target);
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return target->thread.used_spe ? regset->n : 0;
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}
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int evr_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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flush_spe_to_thread(target);
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membuf_write(&to, &target->thread.evr, sizeof(target->thread.evr));
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BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
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offsetof(struct thread_struct, spefscr));
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return membuf_write(&to, &target->thread.acc,
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sizeof(u64) + sizeof(u32));
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}
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int evr_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_spe_to_thread(target);
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&target->thread.evr,
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0, sizeof(target->thread.evr));
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BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
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offsetof(struct thread_struct, spefscr));
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if (!ret)
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&target->thread.acc,
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sizeof(target->thread.evr), -1);
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return ret;
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}
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