Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) #include <linux/thread_info.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <asm/sigcontext.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <asm/fpumacro.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <asm/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <asm/switch_to.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include "sigutil.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 	unsigned long *fpregs = current_thread_info()->fpregs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	unsigned long fprs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 	fprs = current_thread_info()->fpsaved[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	if (fprs & FPRS_DL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 		err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 				    (sizeof(unsigned int) * 32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	if (fprs & FPRS_DU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 		err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 				    (sizeof(unsigned int) * 32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	err |= __put_user(fprs, &fpu->si_fprs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	unsigned long *fpregs = current_thread_info()->fpregs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	unsigned long fprs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	if (((unsigned long) fpu) & 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	err = get_user(fprs, &fpu->si_fprs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	fprs_write(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	regs->tstate &= ~TSTATE_PEF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	if (fprs & FPRS_DL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		       	       (sizeof(unsigned int) * 32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	if (fprs & FPRS_DU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		       	       (sizeof(unsigned int) * 32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	current_thread_info()->fpsaved[0] |= fprs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	int i, err = __put_user(wsaved, &rwin->wsaved);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	for (i = 0; i < wsaved; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		struct reg_window *rp = &current_thread_info()->reg_window[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		unsigned long fp = current_thread_info()->rwbuf_stkptrs[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		err |= copy_to_user(&rwin->reg_window[i], rp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 				    sizeof(struct reg_window));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) int restore_rwin_state(__siginfo_rwin_t __user *rp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	struct thread_info *t = current_thread_info();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	int i, wsaved, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	if (((unsigned long) rp) & 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	get_user(wsaved, &rp->wsaved);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	if (wsaved > NSWINS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	for (i = 0; i < wsaved; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		err |= copy_from_user(&t->reg_window[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 				      &rp->reg_window[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 				      sizeof(struct reg_window));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		err |= __get_user(t->rwbuf_stkptrs[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 				  &rp->rwbuf_stkptrs[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	set_thread_wsaved(wsaved);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	synchronize_user_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	if (get_thread_wsaved())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }