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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *    Copyright IBM Corp. 1999, 2006
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *    Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *    Based on Intel version
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *  Copyright (C) 1991, 1992  Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  *  1997-11-28  Modified for POSIX.1b signals by Richard Henderson
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/stddef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/tty.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/personality.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/binfmts.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <linux/tracehook.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include <asm/ucontext.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #include <asm/lowcore.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #include <asm/switch_to.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #include "entry.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  * Layout of an old-style signal-frame:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38)  *	-----------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  *	| save area (_SIGNAL_FRAMESIZE)		|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  *	-----------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  *	| struct sigcontext			|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  *	|	oldmask				|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  *	|	_sigregs *			|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  *	-----------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  *	| _sigregs with				|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  *	|	_s390_regs_common		|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47)  *	|	_s390_fp_regs			|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48)  *	-----------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  *	| int signo				|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  *	-----------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  *	| _sigregs_ext with			|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52)  *	|	gprs_high 64 byte (opt)		|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53)  *	|	vxrs_low 128 byte (opt)		|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54)  *	|	vxrs_high 256 byte (opt)	|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55)  *	|	reserved 128 byte (opt)		|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56)  *	-----------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57)  *	| __u16 svc_insn			|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58)  *	-----------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59)  * The svc_insn entry with the sigreturn system call opcode does not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60)  * have a fixed position and moves if gprs_high or vxrs exist.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61)  * Future extensions will be added to _sigregs_ext.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) struct sigframe
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	__u8 callee_used_stack[__SIGNAL_FRAMESIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	struct sigcontext sc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	_sigregs sregs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	int signo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	_sigregs_ext sregs_ext;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	__u16 svc_insn;		/* Offset of svc_insn is NOT fixed! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) };
^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)  * Layout of an rt signal-frame:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75)  *	-----------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76)  *	| save area (_SIGNAL_FRAMESIZE)		|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77)  *	-----------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78)  *	| svc __NR_rt_sigreturn 2 byte		|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79)  *	-----------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80)  *	| struct siginfo			|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81)  *	-----------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82)  *	| struct ucontext_extended with		|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83)  *	|	unsigned long uc_flags		|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84)  *	|	struct ucontext *uc_link	|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85)  *	|	stack_t uc_stack		|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86)  *	|	_sigregs uc_mcontext with	|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87)  *	|		_s390_regs_common	|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88)  *	|		_s390_fp_regs		|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89)  *	|	sigset_t uc_sigmask		|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90)  *	|	_sigregs_ext uc_mcontext_ext	|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91)  *	|		gprs_high 64 byte (opt)	|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92)  *	|		vxrs_low 128 byte (opt)	|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93)  *	|		vxrs_high 256 byte (opt)|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94)  *	|		reserved 128 byte (opt)	|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95)  *	-----------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96)  * Future extensions will be added to _sigregs_ext.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) struct rt_sigframe
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	__u8 callee_used_stack[__SIGNAL_FRAMESIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	__u16 svc_insn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	struct siginfo info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	struct ucontext_extended uc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) /* Store registers needed to create the signal frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static void store_sigregs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	save_access_regs(current->thread.acrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	save_fpu_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /* Load registers after signal return */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static void load_sigregs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	restore_access_regs(current->thread.acrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) /* Returns non-zero on fault. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static int save_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	_sigregs user_sregs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	/* Copy a 'clean' PSW mask to the user to avoid leaking
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	   information about whether PER is currently on.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	user_sregs.regs.psw.mask = PSW_USER_BITS |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		(regs->psw.mask & (PSW_MASK_USER | PSW_MASK_RI));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	user_sregs.regs.psw.addr = regs->psw.addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	memcpy(&user_sregs.regs.gprs, &regs->gprs, sizeof(sregs->regs.gprs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	memcpy(&user_sregs.regs.acrs, current->thread.acrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	       sizeof(user_sregs.regs.acrs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	fpregs_store(&user_sregs.fpregs, &current->thread.fpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	if (__copy_to_user(sregs, &user_sregs, sizeof(_sigregs)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	_sigregs user_sregs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	/* Alwys make any pending restarted system call return -EINTR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	current->restart_block.fn = do_no_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	if (__copy_from_user(&user_sregs, sregs, sizeof(user_sregs)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	if (!is_ri_task(current) && (user_sregs.regs.psw.mask & PSW_MASK_RI))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	/* Test the floating-point-control word. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if (test_fp_ctl(user_sregs.fpregs.fpc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	/* Use regs->psw.mask instead of PSW_USER_BITS to preserve PER bit. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	regs->psw.mask = (regs->psw.mask & ~(PSW_MASK_USER | PSW_MASK_RI)) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		(user_sregs.regs.psw.mask & (PSW_MASK_USER | PSW_MASK_RI));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	/* Check for invalid user address space control. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	if ((regs->psw.mask & PSW_MASK_ASC) == PSW_ASC_HOME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		regs->psw.mask = PSW_ASC_PRIMARY |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 			(regs->psw.mask & ~PSW_MASK_ASC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	/* Check for invalid amode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	if (regs->psw.mask & PSW_MASK_EA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		regs->psw.mask |= PSW_MASK_BA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	regs->psw.addr = user_sregs.regs.psw.addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	memcpy(&regs->gprs, &user_sregs.regs.gprs, sizeof(sregs->regs.gprs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	memcpy(&current->thread.acrs, &user_sregs.regs.acrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	       sizeof(current->thread.acrs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	fpregs_load(&user_sregs.fpregs, &current->thread.fpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	clear_pt_regs_flag(regs, PIF_SYSCALL); /* No longer in a system call */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) /* Returns non-zero on fault. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) static int save_sigregs_ext(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 			    _sigregs_ext __user *sregs_ext)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	__u64 vxrs[__NUM_VXRS_LOW];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	/* Save vector registers to signal stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	if (MACHINE_HAS_VX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		for (i = 0; i < __NUM_VXRS_LOW; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 			vxrs[i] = *((__u64 *)(current->thread.fpu.vxrs + i) + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		if (__copy_to_user(&sregs_ext->vxrs_low, vxrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 				   sizeof(sregs_ext->vxrs_low)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		    __copy_to_user(&sregs_ext->vxrs_high,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 				   current->thread.fpu.vxrs + __NUM_VXRS_LOW,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 				   sizeof(sregs_ext->vxrs_high)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) static int restore_sigregs_ext(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 			       _sigregs_ext __user *sregs_ext)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	__u64 vxrs[__NUM_VXRS_LOW];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	/* Restore vector registers from signal stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	if (MACHINE_HAS_VX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		if (__copy_from_user(vxrs, &sregs_ext->vxrs_low,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 				     sizeof(sregs_ext->vxrs_low)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		    __copy_from_user(current->thread.fpu.vxrs + __NUM_VXRS_LOW,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 				     &sregs_ext->vxrs_high,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 				     sizeof(sregs_ext->vxrs_high)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		for (i = 0; i < __NUM_VXRS_LOW; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 			*((__u64 *)(current->thread.fpu.vxrs + i) + 1) = vxrs[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) SYSCALL_DEFINE0(sigreturn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	struct pt_regs *regs = task_pt_regs(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	struct sigframe __user *frame =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		(struct sigframe __user *) regs->gprs[15];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	sigset_t set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	set_current_blocked(&set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	save_fpu_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	if (restore_sigregs(regs, &frame->sregs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	if (restore_sigregs_ext(regs, &frame->sregs_ext))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	load_sigregs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	return regs->gprs[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) badframe:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	force_sig(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) SYSCALL_DEFINE0(rt_sigreturn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	struct pt_regs *regs = task_pt_regs(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	struct rt_sigframe __user *frame =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		(struct rt_sigframe __user *)regs->gprs[15];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	sigset_t set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	if (__copy_from_user(&set.sig, &frame->uc.uc_sigmask, sizeof(set)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	set_current_blocked(&set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	if (restore_altstack(&frame->uc.uc_stack))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	save_fpu_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	if (restore_sigregs(regs, &frame->uc.uc_mcontext))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	if (restore_sigregs_ext(regs, &frame->uc.uc_mcontext_ext))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	load_sigregs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	return regs->gprs[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) badframe:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	force_sig(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)  * Determine which stack to use..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) static inline void __user *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	unsigned long sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	/* Default to using normal stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	sp = regs->gprs[15];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	/* Overflow on alternate signal stack gives SIGSEGV. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		return (void __user *) -1UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	/* This is the X/Open sanctioned signal stack switching.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	if (ka->sa.sa_flags & SA_ONSTACK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 		if (! sas_ss_flags(sp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 			sp = current->sas_ss_sp + current->sas_ss_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	return (void __user *)((sp - frame_size) & -8ul);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) static int setup_frame(int sig, struct k_sigaction *ka,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		       sigset_t *set, struct pt_regs * regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	struct sigframe __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	struct sigcontext sc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	unsigned long restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	size_t frame_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	 * gprs_high are only present for a 31-bit task running on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	 * a 64-bit kernel (see compat_signal.c) but the space for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	 * gprs_high need to be allocated if vector registers are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	 * included in the signal frame on a 31-bit system.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	frame_size = sizeof(*frame) - sizeof(frame->sregs_ext);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	if (MACHINE_HAS_VX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 		frame_size += sizeof(frame->sregs_ext);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	frame = get_sigframe(ka, regs, frame_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	if (frame == (void __user *) -1UL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	/* Set up backchain. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	if (__put_user(regs->gprs[15], (addr_t __user *) frame))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	/* Create struct sigcontext on the signal stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	memcpy(&sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	sc.sregs = (_sigregs __user __force *) &frame->sregs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	if (__copy_to_user(&frame->sc, &sc, sizeof(frame->sc)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	/* Store registers needed to create the signal frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	store_sigregs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	/* Create _sigregs on the signal stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	if (save_sigregs(regs, &frame->sregs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	/* Place signal number on stack to allow backtrace from handler.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	if (__put_user(regs->gprs[2], (int __user *) &frame->signo))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	/* Create _sigregs_ext on the signal stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	if (save_sigregs_ext(regs, &frame->sregs_ext))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	/* Set up to return from userspace.  If provided, use a stub
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	   already in userspace.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	if (ka->sa.sa_flags & SA_RESTORER) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		restorer = (unsigned long) ka->sa.sa_restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 		/* Signal frame without vector registers are short ! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		__u16 __user *svc = (void __user *) frame + frame_size - 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, svc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		restorer = (unsigned long) svc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	/* Set up registers for signal handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	regs->gprs[14] = restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	regs->gprs[15] = (unsigned long) frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	/* Force default amode and default user address space control. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	regs->psw.mask = PSW_MASK_EA | PSW_MASK_BA |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		(PSW_USER_BITS & PSW_MASK_ASC) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 		(regs->psw.mask & ~PSW_MASK_ASC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	regs->psw.addr = (unsigned long) ka->sa.sa_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	regs->gprs[2] = sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	regs->gprs[3] = (unsigned long) &frame->sc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	/* We forgot to include these in the sigcontext.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	   To avoid breaking binary compatibility, they are passed as args. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	    sig == SIGTRAP || sig == SIGFPE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		/* set extra registers only for synchronous signals */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 		regs->gprs[4] = regs->int_code & 127;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		regs->gprs[5] = regs->int_parm_long;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		regs->gprs[6] = current->thread.last_break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 			  struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	struct rt_sigframe __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	unsigned long uc_flags, restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	size_t frame_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	frame_size = sizeof(struct rt_sigframe) - sizeof(_sigregs_ext);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	 * gprs_high are only present for a 31-bit task running on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	 * a 64-bit kernel (see compat_signal.c) but the space for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	 * gprs_high need to be allocated if vector registers are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	 * included in the signal frame on a 31-bit system.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	uc_flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	if (MACHINE_HAS_VX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 		frame_size += sizeof(_sigregs_ext);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 		uc_flags |= UC_VXRS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	frame = get_sigframe(&ksig->ka, regs, frame_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	if (frame == (void __user *) -1UL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	/* Set up backchain. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	if (__put_user(regs->gprs[15], (addr_t __user *) frame))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	/* Set up to return from userspace.  If provided, use a stub
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	   already in userspace.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 	if (ksig->ka.sa.sa_flags & SA_RESTORER) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 		restorer = (unsigned long) ksig->ka.sa.sa_restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 		__u16 __user *svc = &frame->svc_insn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 		if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, svc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 		restorer = (unsigned long) svc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	/* Create siginfo on the signal stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 	if (copy_siginfo_to_user(&frame->info, &ksig->info))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 	/* Store registers needed to create the signal frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	store_sigregs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 	/* Create ucontext on the signal stack. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 	if (__put_user(uc_flags, &frame->uc.uc_flags) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 	    __put_user(NULL, &frame->uc.uc_link) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 	    __save_altstack(&frame->uc.uc_stack, regs->gprs[15]) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 	    save_sigregs(regs, &frame->uc.uc_mcontext) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 	    __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	    save_sigregs_ext(regs, &frame->uc.uc_mcontext_ext))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 	/* Set up registers for signal handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 	regs->gprs[14] = restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	regs->gprs[15] = (unsigned long) frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 	/* Force default amode and default user address space control. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 	regs->psw.mask = PSW_MASK_EA | PSW_MASK_BA |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 		(PSW_USER_BITS & PSW_MASK_ASC) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 		(regs->psw.mask & ~PSW_MASK_ASC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 	regs->psw.addr = (unsigned long) ksig->ka.sa.sa_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 	regs->gprs[2] = ksig->sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 	regs->gprs[3] = (unsigned long) &frame->info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 	regs->gprs[4] = (unsigned long) &frame->uc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	regs->gprs[5] = current->thread.last_break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) static void handle_signal(struct ksignal *ksig, sigset_t *oldset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 			  struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 	/* Set up the stack frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 	if (ksig->ka.sa.sa_flags & SA_SIGINFO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 		ret = setup_rt_frame(ksig, oldset, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 		ret = setup_frame(ksig->sig, &ksig->ka, oldset, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 	signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLE_STEP));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)  * Note that 'init' is a special process: it doesn't get signals it doesn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)  * want to handle. Thus you cannot kill init even with a SIGKILL even by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)  * mistake.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)  * Note that we go through the signals twice: once to check the signals that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)  * the kernel can handle, and then we build all the user-level signal handling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460)  * stack-frames in one go after that.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) void do_signal(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) 	struct ksignal ksig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) 	sigset_t *oldset = sigmask_to_save();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) 	 * Get signal to deliver. When running under ptrace, at this point
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) 	 * the debugger may change all our registers, including the system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) 	 * call information.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) 	current->thread.system_call =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) 		test_pt_regs_flag(regs, PIF_SYSCALL) ? regs->int_code : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) 	if (get_signal(&ksig)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) 		/* Whee!  Actually deliver the signal.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) 		if (current->thread.system_call) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) 			regs->int_code = current->thread.system_call;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) 			/* Check for system call restarting. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) 			switch (regs->gprs[2]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) 			case -ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) 			case -ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) 				regs->gprs[2] = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) 			case -ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) 				if (!(ksig.ka.sa.sa_flags & SA_RESTART)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) 					regs->gprs[2] = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) 					break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) 				}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) 				fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) 			case -ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) 				regs->gprs[2] = regs->orig_gpr2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) 				regs->psw.addr =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) 					__rewind_psw(regs->psw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) 						     regs->int_code >> 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) 		/* No longer in a system call */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) 		clear_pt_regs_flag(regs, PIF_SYSCALL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) 		rseq_signal_deliver(&ksig, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) 		if (is_compat_task())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) 			handle_signal32(&ksig, oldset, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) 			handle_signal(&ksig, oldset, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) 	/* No handlers present - check for system call restart */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) 	clear_pt_regs_flag(regs, PIF_SYSCALL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) 	if (current->thread.system_call) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) 		regs->int_code = current->thread.system_call;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) 		switch (regs->gprs[2]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) 		case -ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) 			/* Restart with sys_restart_syscall */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) 			regs->int_code = __NR_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) 			fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) 		case -ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) 		case -ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) 		case -ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) 			/* Restart system call with magic TIF bit. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) 			regs->gprs[2] = regs->orig_gpr2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) 			set_pt_regs_flag(regs, PIF_SYSCALL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) 			if (test_thread_flag(TIF_SINGLE_STEP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) 				clear_pt_regs_flag(regs, PIF_PER_TRAP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) 	 * If there's no signal to deliver, we just put the saved sigmask back.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) 	restore_saved_sigmask();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) void do_notify_resume(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) 	tracehook_notify_resume(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) 	rseq_handle_notify_resume(NULL, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) }