Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 | // SPDX-License-Identifier: GPL-2.0
/*
* Helper functions for trap handlers
*
* Copyright (C) 2000-2007, Axis Communications AB.
*
* Authors: Bjorn Wesen
* Hans-Peter Nilsson
*
*/
#include <linux/ptrace.h>
#include <linux/uaccess.h>
#include <linux/sched/debug.h>
#include <arch/sv_addr_ag.h>
#include <arch/system.h>
void
show_registers(struct pt_regs *regs)
{
/*
* It's possible to use either the USP register or current->thread.usp.
* USP might not correspond to the current process for all cases this
* function is called, and current->thread.usp isn't up to date for the
* current process. Experience shows that using USP is the way to go.
*/
unsigned long usp = rdusp();
printk("IRP: %08lx SRP: %08lx DCCR: %08lx USP: %08lx MOF: %08lx\n",
regs->irp, regs->srp, regs->dccr, usp, regs->mof);
printk(" r0: %08lx r1: %08lx r2: %08lx r3: %08lx\n",
regs->r0, regs->r1, regs->r2, regs->r3);
printk(" r4: %08lx r5: %08lx r6: %08lx r7: %08lx\n",
regs->r4, regs->r5, regs->r6, regs->r7);
printk(" r8: %08lx r9: %08lx r10: %08lx r11: %08lx\n",
regs->r8, regs->r9, regs->r10, regs->r11);
printk("r12: %08lx r13: %08lx oR10: %08lx sp: %08lx\n",
regs->r12, regs->r13, regs->orig_r10, (long unsigned)regs);
printk("R_MMU_CAUSE: %08lx\n", (unsigned long)*R_MMU_CAUSE);
printk("Process %s (pid: %d, stackpage=%08lx)\n",
current->comm, current->pid, (unsigned long)current);
/*
* When in-kernel, we also print out the stack and code at the
* time of the fault..
*/
if (!user_mode(regs)) {
int i;
show_stack(NULL, (unsigned long *)usp);
/*
* If the previous stack-dump wasn't a kernel one, dump the
* kernel stack now.
*/
if (usp != 0)
show_stack(NULL, NULL);
printk("\nCode: ");
if (regs->irp < PAGE_OFFSET)
goto bad_value;
/*
* Quite often the value at regs->irp doesn't point to the
* interesting instruction, which often is the previous
* instruction. So dump at an offset large enough that the
* instruction decoding should be in sync at the interesting
* point, but small enough to fit on a row. The regs->irp
* location is pointed out in a ksymoops-friendly way by
* wrapping the byte for that address in parenthesises.
*/
for (i = -12; i < 12; i++) {
unsigned char c;
if (__get_user(c, &((unsigned char *)regs->irp)[i])) {
bad_value:
printk(" Bad IP value.");
break;
}
if (i == 0)
printk("(%02x) ", c);
else
printk("%02x ", c);
}
printk("\n");
}
}
void
arch_enable_nmi(void)
{
asm volatile ("setf m");
}
extern void (*nmi_handler)(struct pt_regs *);
void handle_nmi(struct pt_regs *regs)
{
if (nmi_handler)
nmi_handler(regs);
/* Wait until nmi is no longer active. (We enable NMI immediately after
returning from this function, and we don't want it happening while
exiting from the NMI interrupt handler.) */
while (*R_IRQ_MASK0_RD & IO_STATE(R_IRQ_MASK0_RD, nmi_pin, active))
;
}
#ifdef CONFIG_DEBUG_BUGVERBOSE
void
handle_BUG(struct pt_regs *regs)
{
struct bug_frame f;
unsigned char c;
unsigned long irp = regs->irp;
if (__copy_from_user(&f, (const void __user *)(irp - 8), sizeof f))
return;
if (f.prefix != BUG_PREFIX || f.magic != BUG_MAGIC)
return;
if (__get_user(c, f.filename))
f.filename = "<bad filename>";
printk("kernel BUG at %s:%d!\n", f.filename, f.line);
}
#endif
|