mirror of https://gitee.com/openkylin/linux.git
96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/thread_info.h>
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#include <linux/uaccess.h>
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#include <linux/errno.h>
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#include <asm/sigcontext.h>
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#include <asm/fpumacro.h>
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#include <asm/ptrace.h>
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#include <asm/switch_to.h>
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#include "sigutil.h"
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int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
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{
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unsigned long *fpregs = current_thread_info()->fpregs;
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unsigned long fprs;
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int err = 0;
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fprs = current_thread_info()->fpsaved[0];
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if (fprs & FPRS_DL)
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err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
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(sizeof(unsigned int) * 32));
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if (fprs & FPRS_DU)
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err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
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(sizeof(unsigned int) * 32));
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err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
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err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
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err |= __put_user(fprs, &fpu->si_fprs);
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return err;
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}
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int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
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{
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unsigned long *fpregs = current_thread_info()->fpregs;
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unsigned long fprs;
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int err;
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err = __get_user(fprs, &fpu->si_fprs);
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fprs_write(0);
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regs->tstate &= ~TSTATE_PEF;
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if (fprs & FPRS_DL)
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err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
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(sizeof(unsigned int) * 32));
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if (fprs & FPRS_DU)
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err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
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(sizeof(unsigned int) * 32));
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err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
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err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
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current_thread_info()->fpsaved[0] |= fprs;
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return err;
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}
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int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
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{
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int i, err = __put_user(wsaved, &rwin->wsaved);
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for (i = 0; i < wsaved; i++) {
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struct reg_window *rp = ¤t_thread_info()->reg_window[i];
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unsigned long fp = current_thread_info()->rwbuf_stkptrs[i];
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err |= copy_to_user(&rwin->reg_window[i], rp,
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sizeof(struct reg_window));
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err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
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}
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return err;
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}
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int restore_rwin_state(__siginfo_rwin_t __user *rp)
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{
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struct thread_info *t = current_thread_info();
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int i, wsaved, err;
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__get_user(wsaved, &rp->wsaved);
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if (wsaved > NSWINS)
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return -EFAULT;
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err = 0;
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for (i = 0; i < wsaved; i++) {
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err |= copy_from_user(&t->reg_window[i],
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&rp->reg_window[i],
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sizeof(struct reg_window));
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err |= __get_user(t->rwbuf_stkptrs[i],
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&rp->rwbuf_stkptrs[i]);
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}
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if (err)
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return err;
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set_thread_wsaved(wsaved);
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synchronize_user_stack();
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if (get_thread_wsaved())
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return -EFAULT;
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return 0;
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}
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