Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2)  * Common signal handling code for both 32 and 64 bits
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *    Copyright (c) 2007 Benjamin Herrenschmidt, IBM Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *    Extracted from signal_32.c and signal_64.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * This file is subject to the terms and conditions of the GNU General
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * Public License.  See the file README.legal in the main directory of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * this archive for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/tracehook.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/uprobes.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/key.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/context_tracking.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/livepatch.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <asm/hw_breakpoint.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <asm/switch_to.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <asm/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <asm/debug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <asm/tm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include "signal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #ifdef CONFIG_VSX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) unsigned long copy_fpr_to_user(void __user *to,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 			       struct task_struct *task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	u64 buf[ELF_NFPREG];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	/* save FPR copy to local buffer then write to the thread_struct */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	for (i = 0; i < (ELF_NFPREG - 1) ; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		buf[i] = task->thread.TS_FPR(i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	buf[i] = task->thread.fp_state.fpscr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) unsigned long copy_fpr_from_user(struct task_struct *task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 				 void __user *from)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	u64 buf[ELF_NFPREG];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	for (i = 0; i < (ELF_NFPREG - 1) ; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		task->thread.TS_FPR(i) = buf[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	task->thread.fp_state.fpscr = buf[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) unsigned long copy_vsx_to_user(void __user *to,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 			       struct task_struct *task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	u64 buf[ELF_NVSRHALFREG];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	/* save FPR copy to local buffer then write to the thread_struct */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	for (i = 0; i < ELF_NVSRHALFREG; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		buf[i] = task->thread.fp_state.fpr[i][TS_VSRLOWOFFSET];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) unsigned long copy_vsx_from_user(struct task_struct *task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 				 void __user *from)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	u64 buf[ELF_NVSRHALFREG];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	for (i = 0; i < ELF_NVSRHALFREG ; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		task->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) unsigned long copy_ckfpr_to_user(void __user *to,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 				  struct task_struct *task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	u64 buf[ELF_NFPREG];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	/* save FPR copy to local buffer then write to the thread_struct */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	for (i = 0; i < (ELF_NFPREG - 1) ; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		buf[i] = task->thread.TS_CKFPR(i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	buf[i] = task->thread.ckfp_state.fpscr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) unsigned long copy_ckfpr_from_user(struct task_struct *task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 					  void __user *from)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	u64 buf[ELF_NFPREG];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	for (i = 0; i < (ELF_NFPREG - 1) ; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		task->thread.TS_CKFPR(i) = buf[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	task->thread.ckfp_state.fpscr = buf[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) unsigned long copy_ckvsx_to_user(void __user *to,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 				  struct task_struct *task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	u64 buf[ELF_NVSRHALFREG];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	/* save FPR copy to local buffer then write to the thread_struct */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	for (i = 0; i < ELF_NVSRHALFREG; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		buf[i] = task->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) unsigned long copy_ckvsx_from_user(struct task_struct *task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 					  void __user *from)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	u64 buf[ELF_NVSRHALFREG];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	for (i = 0; i < ELF_NVSRHALFREG ; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		task->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) inline unsigned long copy_fpr_to_user(void __user *to,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 				      struct task_struct *task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	return __copy_to_user(to, task->thread.fp_state.fpr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 			      ELF_NFPREG * sizeof(double));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) inline unsigned long copy_fpr_from_user(struct task_struct *task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 					void __user *from)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	return __copy_from_user(task->thread.fp_state.fpr, from,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			      ELF_NFPREG * sizeof(double));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) inline unsigned long copy_ckfpr_to_user(void __user *to,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 					 struct task_struct *task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	return __copy_to_user(to, task->thread.ckfp_state.fpr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 			      ELF_NFPREG * sizeof(double));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) inline unsigned long copy_ckfpr_from_user(struct task_struct *task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 						 void __user *from)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	return __copy_from_user(task->thread.ckfp_state.fpr, from,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 				ELF_NFPREG * sizeof(double));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) /* Log an error when sending an unhandled signal to a process. Controlled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)  * through debug.exception-trace sysctl.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) int show_unhandled_signals = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)  * Allocate space for the signal frame
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) void __user *get_sigframe(struct ksignal *ksig, unsigned long sp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 			   size_t frame_size, int is_32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)         unsigned long oldsp, newsp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)         /* Default to using normal stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)         oldsp = get_clean_sp(sp, is_32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	oldsp = sigsp(oldsp, ksig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	newsp = (oldsp - frame_size) & ~0xFUL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	/* Check access */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	if (!access_ok((void __user *)newsp, oldsp - newsp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)         return (void __user *)newsp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) static void check_syscall_restart(struct pt_regs *regs, struct k_sigaction *ka,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 				  int has_handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	unsigned long ret = regs->gpr[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	int restart = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	/* syscall ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	if (!trap_is_syscall(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	if (trap_norestart(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	/* error signalled ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	if (trap_is_scv(regs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		/* 32-bit compat mode sign extend? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		if (!IS_ERR_VALUE(ret))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		ret = -ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	} else if (!(regs->ccr & 0x10000000)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		return;
^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) 	switch (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	case ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	case ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		/* ERESTARTNOHAND means that the syscall should only be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		 * restarted if there was no handler for the signal, and since
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		 * we only get here if there is a handler, we dont restart.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		restart = !has_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	case ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		/* ERESTARTSYS means to restart the syscall if there is no
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		 * handler or the handler was registered with SA_RESTART
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		restart = !has_handler || (ka->sa.sa_flags & SA_RESTART) != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	case ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		/* ERESTARTNOINTR means that the syscall should be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		 * called again after the signal handler returns.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	if (restart) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		if (ret == ERESTART_RESTARTBLOCK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 			regs->gpr[0] = __NR_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 			regs->gpr[3] = regs->orig_gpr3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		regs->nip -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		regs->result = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		if (trap_is_scv(regs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 			regs->result = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 			regs->gpr[3] = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 			regs->result = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 			regs->gpr[3] = EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 			regs->ccr |= 0x10000000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) static void do_signal(struct task_struct *tsk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	sigset_t *oldset = sigmask_to_save();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	struct ksignal ksig = { .sig = 0 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	BUG_ON(tsk != current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	get_signal(&ksig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	/* Is there any syscall restart business here ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	check_syscall_restart(tsk->thread.regs, &ksig.ka, ksig.sig > 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	if (ksig.sig <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		/* No signal to deliver -- put the saved sigmask back */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		restore_saved_sigmask();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		set_trap_norestart(tsk->thread.regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		return;               /* no signals delivered */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)         /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	 * Reenable the DABR before delivering the signal to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	 * user space. The DABR will have been cleared if it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	 * triggered inside the kernel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	if (!IS_ENABLED(CONFIG_PPC_ADV_DEBUG_REGS)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		for (i = 0; i < nr_wp_slots(); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 			if (tsk->thread.hw_brk[i].address && tsk->thread.hw_brk[i].type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 				__set_breakpoint(i, &tsk->thread.hw_brk[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	/* Re-enable the breakpoints for the signal stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	thread_change_pc(tsk, tsk->thread.regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	rseq_signal_deliver(&ksig, tsk->thread.regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	if (is_32bit_task()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)         	if (ksig.ka.sa.sa_flags & SA_SIGINFO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 			ret = handle_rt_signal32(&ksig, oldset, tsk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 			ret = handle_signal32(&ksig, oldset, tsk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		ret = handle_rt_signal64(&ksig, oldset, tsk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	set_trap_norestart(tsk->thread.regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	signal_setup_done(ret, &ksig, test_thread_flag(TIF_SINGLESTEP));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	user_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	if (thread_info_flags & _TIF_UPROBE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		uprobe_notify_resume(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	if (thread_info_flags & _TIF_PATCH_PENDING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		klp_update_patch_state(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	if (thread_info_flags & _TIF_SIGPENDING) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		BUG_ON(regs != current->thread.regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		do_signal(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 		tracehook_notify_resume(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		rseq_handle_notify_resume(NULL, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	user_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) unsigned long get_tm_stackpointer(struct task_struct *tsk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	/* When in an active transaction that takes a signal, we need to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	 * careful with the stack.  It's possible that the stack has moved back
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	 * up after the tbegin.  The obvious case here is when the tbegin is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	 * called inside a function that returns before a tend.  In this case,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	 * the stack is part of the checkpointed transactional memory state.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	 * If we write over this non transactionally or in suspend, we are in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	 * trouble because if we get a tm abort, the program counter and stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	 * pointer will be back at the tbegin but our in memory stack won't be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	 * valid anymore.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	 * To avoid this, when taking a signal in an active transaction, we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	 * need to use the stack pointer from the checkpointed state, rather
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	 * than the speculated state.  This ensures that the signal context
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	 * (written tm suspended) will be written below the stack required for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	 * the rollback.  The transaction is aborted because of the treclaim,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	 * so any memory written between the tbegin and the signal will be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	 * rolled back anyway.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	 * For signals taken in non-TM or suspended mode, we use the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	 * normal/non-checkpointed stack pointer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	unsigned long ret = tsk->thread.regs->gpr[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	BUG_ON(tsk != current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	if (MSR_TM_ACTIVE(tsk->thread.regs->msr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		preempt_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 		tm_reclaim_current(TM_CAUSE_SIGNAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 		if (MSR_TM_TRANSACTIONAL(tsk->thread.regs->msr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 			ret = tsk->thread.ckpt_regs.gpr[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 		 * If we treclaim, we must clear the current thread's TM bits
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 		 * before re-enabling preemption. Otherwise we might be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 		 * preempted and have the live MSR[TS] changed behind our back
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 		 * (tm_recheckpoint_new_task() would recheckpoint). Besides, we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 		 * enter the signal handler in non-transactional state.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 		tsk->thread.regs->msr &= ~MSR_TS_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		preempt_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) }