Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Kernel traps/events for Hexagon processor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (c) 2010-2014, The Linux Foundation. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/sched/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/sched/debug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/kallsyms.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/kdebug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/tracehook.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <asm/traps.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <asm/vm_fault.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <asm/syscall.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <asm/registers.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/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #ifdef CONFIG_KGDB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) # include <linux/kgdb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define TRAP_SYSCALL	1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define TRAP_DEBUG	0xdb
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) void __init trap_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) {
^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) #ifdef CONFIG_GENERIC_BUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) /* Maybe should resemble arch/sh/kernel/traps.c ?? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) int is_valid_bugaddr(unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) #endif /* CONFIG_GENERIC_BUG */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) static const char *ex_name(int ex)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	switch (ex) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	case HVM_GE_C_XPROT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	case HVM_GE_C_XUSER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		return "Execute protection fault";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	case HVM_GE_C_RPROT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	case HVM_GE_C_RUSER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		return "Read protection fault";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	case HVM_GE_C_WPROT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	case HVM_GE_C_WUSER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		return "Write protection fault";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	case HVM_GE_C_XMAL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		return "Misaligned instruction";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	case HVM_GE_C_WREG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		return "Multiple writes to same register in packet";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	case HVM_GE_C_PCAL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		return "Program counter values that are not properly aligned";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	case HVM_GE_C_RMAL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		return "Misaligned data load";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	case HVM_GE_C_WMAL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		return "Misaligned data store";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	case HVM_GE_C_INVI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	case HVM_GE_C_PRIVI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		return "Illegal instruction";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	case HVM_GE_C_BUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		return "Precise bus error";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	case HVM_GE_C_CACHE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		return "Cache error";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	case 0xdb:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		return "Debugger trap";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		return "Unrecognized exception";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) static void do_show_stack(struct task_struct *task, unsigned long *fp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 			  unsigned long ip, const char *loglvl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	int kstack_depth_to_print = 24;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	unsigned long offset, size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	const char *name = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	unsigned long *newfp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	unsigned long low, high;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	char tmpstr[128];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	char *modname;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	if (task == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		task = current;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	printk("%sCPU#%d, %s/%d, Call Trace:\n", loglvl, raw_smp_processor_id(),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		task->comm, task_pid_nr(task));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	if (fp == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		if (task == current) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 			asm("%0 = r30" : "=r" (fp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 			fp = (unsigned long *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 			     ((struct hexagon_switch_stack *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 			     task->thread.switch_sp)->fp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	if ((((unsigned long) fp) & 0x3) || ((unsigned long) fp < 0x1000)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		printk("%s-- Corrupt frame pointer %p\n", loglvl, fp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	/* Saved link reg is one word above FP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	if (!ip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		ip = *(fp+1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	/* Expect kernel stack to be in-bounds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	low = (unsigned long)task_stack_page(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	high = low + THREAD_SIZE - 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	low += sizeof(struct thread_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	for (i = 0; i < kstack_depth_to_print; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		name = kallsyms_lookup(ip, &size, &offset, &modname, tmpstr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		printk("%s[%p] 0x%lx: %s + 0x%lx", loglvl, fp, ip, name, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		if (((unsigned long) fp < low) || (high < (unsigned long) fp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 			printk(KERN_CONT " (FP out of bounds!)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		if (modname)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 			printk(KERN_CONT " [%s] ", modname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		printk(KERN_CONT "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		newfp = (unsigned long *) *fp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		if (((unsigned long) newfp) & 0x3) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 			printk("%s-- Corrupt frame pointer %p\n", loglvl, newfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		/* Attempt to continue past exception. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		if (0 == newfp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 			struct pt_regs *regs = (struct pt_regs *) (((void *)fp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 						+ 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			if (regs->syscall_nr != -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 				printk("%s-- trap0 -- syscall_nr: %ld", loglvl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 					regs->syscall_nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 				printk(KERN_CONT "  psp: %lx  elr: %lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 					 pt_psp(regs), pt_elr(regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 			} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 				/* really want to see more ... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 				kstack_depth_to_print += 6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 				printk("%s-- %s (0x%lx)  badva: %lx\n", loglvl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 					ex_name(pt_cause(regs)), pt_cause(regs),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 					pt_badva(regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 			newfp = (unsigned long *) regs->r30;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 			ip = pt_elr(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 			ip = *(newfp + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		/* If link reg is null, we are done. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		if (ip == 0x0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		/* If newfp isn't larger, we're tracing garbage. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		if (newfp > fp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 			fp = newfp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) void show_stack(struct task_struct *task, unsigned long *fp, const char *loglvl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	/* Saved link reg is one word above FP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	do_show_stack(task, fp, 0, loglvl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) int die(const char *str, struct pt_regs *regs, long err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	static struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		int counter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	} die = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		.lock = __SPIN_LOCK_UNLOCKED(die.lock),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		.counter = 0
^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) 	console_verbose();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	oops_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	spin_lock_irq(&die.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	bust_spinlocks(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	printk(KERN_EMERG "Oops: %s[#%d]:\n", str, ++die.counter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	if (notify_die(DIE_OOPS, str, regs, err, pt_cause(regs), SIGSEGV) ==
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	    NOTIFY_STOP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	print_modules();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	show_regs(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	do_show_stack(current, &regs->r30, pt_elr(regs), KERN_EMERG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	bust_spinlocks(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	spin_unlock_irq(&die.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	if (in_interrupt())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		panic("Fatal exception in interrupt");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	if (panic_on_oops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		panic("Fatal exception");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	oops_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	do_exit(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) int die_if_kernel(char *str, struct pt_regs *regs, long err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	if (!user_mode(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		return die(str, regs, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)  * It's not clear that misaligned fetches are ever recoverable.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) static void misaligned_instruction(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	die_if_kernel("Misaligned Instruction", regs, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	force_sig(SIGBUS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)  * Misaligned loads and stores, on the other hand, can be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)  * emulated, and probably should be, some day.  But for now
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)  * they will be considered fatal.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) static void misaligned_data_load(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	die_if_kernel("Misaligned Data Load", regs, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	force_sig(SIGBUS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) static void misaligned_data_store(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	die_if_kernel("Misaligned Data Store", regs, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	force_sig(SIGBUS);
^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 illegal_instruction(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	die_if_kernel("Illegal Instruction", regs, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	force_sig(SIGILL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)  * Precise bus errors may be recoverable with a a retry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)  * but for now, treat them as irrecoverable.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) static void precise_bus_error(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	die_if_kernel("Precise Bus Error", regs, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	force_sig(SIGBUS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)  * If anything is to be done here other than panic,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)  * it will probably be complex and migrate to another
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)  * source module.  For now, just die.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) static void cache_error(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	die("Cache Error", regs, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)  * General exception handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) void do_genex(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	 * Decode Cause and Dispatch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	switch (pt_cause(regs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	case HVM_GE_C_XPROT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	case HVM_GE_C_XUSER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		execute_protection_fault(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	case HVM_GE_C_RPROT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	case HVM_GE_C_RUSER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		read_protection_fault(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	case HVM_GE_C_WPROT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	case HVM_GE_C_WUSER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		write_protection_fault(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	case HVM_GE_C_XMAL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		misaligned_instruction(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	case HVM_GE_C_WREG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		illegal_instruction(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	case HVM_GE_C_PCAL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 		misaligned_instruction(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	case HVM_GE_C_RMAL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		misaligned_data_load(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	case HVM_GE_C_WMAL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		misaligned_data_store(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	case HVM_GE_C_INVI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	case HVM_GE_C_PRIVI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		illegal_instruction(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	case HVM_GE_C_BUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 		precise_bus_error(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	case HVM_GE_C_CACHE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		cache_error(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 		/* Halt and catch fire */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		panic("Unrecognized exception 0x%lx\n", pt_cause(regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) /* Indirect system call dispatch */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) long sys_syscall(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	printk(KERN_ERR "sys_syscall invoked!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	return -ENOSYS;
^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) void do_trap0(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	syscall_fn syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	switch (pt_cause(regs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	case TRAP_SYSCALL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 		/* System call is trap0 #1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		/* allow strace to catch syscall args  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		if (unlikely(test_thread_flag(TIF_SYSCALL_TRACE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 			tracehook_report_syscall_entry(regs)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 			return;  /*  return -ENOSYS somewhere?  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 		/* Interrupts should be re-enabled for syscall processing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		__vmsetie(VM_INT_ENABLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 		 * System call number is in r6, arguments in r0..r5.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		 * Fortunately, no Linux syscall has more than 6 arguments,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		 * and Hexagon ABI passes first 6 arguments in registers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 		 * 64-bit arguments are passed in odd/even register pairs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 		 * Fortunately, we have no system calls that take more
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 		 * than three arguments with more than one 64-bit value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 		 * Should that change, we'd need to redesign to copy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 		 * between user and kernel stacks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 		regs->syscall_nr = regs->r06;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 		 * GPR R0 carries the first parameter, and is also used
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 		 * to report the return value.  We need a backup of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 		 * the user's value in case we need to do a late restart
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		 * of the system call.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 		regs->restart_r0 = regs->r00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 		if ((unsigned long) regs->syscall_nr >= __NR_syscalls) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 			regs->r00 = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 			syscall = (syscall_fn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 				  (sys_call_table[regs->syscall_nr]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 			regs->r00 = syscall(regs->r00, regs->r01,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 				   regs->r02, regs->r03,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 				   regs->r04, regs->r05);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 		/* allow strace to get the syscall return state  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 		if (unlikely(test_thread_flag(TIF_SYSCALL_TRACE)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 			tracehook_report_syscall_exit(regs, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	case TRAP_DEBUG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 		/* Trap0 0xdb is debug breakpoint */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 		if (user_mode(regs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 			 * Some architecures add some per-thread state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 			 * to distinguish between breakpoint traps and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 			 * trace traps.  We may want to do that, and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 			 * set the si_code value appropriately, or we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 			 * may want to use a different trap0 flavor.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 			force_sig_fault(SIGTRAP, TRAP_BRKPT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 					(void __user *) pt_elr(regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) #ifdef CONFIG_KGDB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 			kgdb_handle_exception(pt_cause(regs), SIGTRAP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 					      TRAP_BRKPT, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 	/* Ignore other trap0 codes for now, especially 0 (Angel calls) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420)  * Machine check exception handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) void do_machcheck(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 	/* Halt and catch fire */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	__vmstop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429)  * Treat this like the old 0xdb trap.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) void do_debug_exception(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 	regs->hvmer.vmest &= ~HVM_VMEST_CAUSE_MSK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	regs->hvmer.vmest |= (TRAP_DEBUG << HVM_VMEST_CAUSE_SFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 	do_trap0(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) }