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riscv: add userland instruction dump to RISC-V splats

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Add userland instruction dump and rename dump_kernel_instr()
to dump_instr().

An example:
[    0.822439] Freeing unused kernel image (initmem) memory: 6916K
[    0.823817] Run /init as init process
[    0.839411] init[1]: unhandled signal 4 code 0x1 at 0x000000000005be18 in bb[10000+5fb000]
[    0.840751] CPU: 0 PID: 1 Comm: init Not tainted 5.14.0-rc4-00049-gbd644290aa72-dirty #187
[    0.841373] Hardware name:  , BIOS
[    0.841743] epc : 000000000005be18 ra : 0000000000079e74 sp : 0000003fffcafda0
[    0.842271]  gp : ffffffff816e9dc8 tp : 0000000000000000 t0 : 0000000000000000
[    0.842947]  t1 : 0000003fffc9fdf0 t2 : 0000000000000000 s0 : 0000000000000000
[    0.843434]  s1 : 0000000000000000 a0 : 0000003fffca0190 a1 : 0000003fffcafe18
[    0.843891]  a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000000
[    0.844357]  a5 : 0000000000000000 a6 : 0000000000000000 a7 : 0000000000000000
[    0.844803]  s2 : 0000000000000000 s3 : 0000000000000000 s4 : 0000000000000000
[    0.845253]  s5 : 0000000000000000 s6 : 0000000000000000 s7 : 0000000000000000
[    0.845722]  s8 : 0000000000000000 s9 : 0000000000000000 s10: 0000000000000000
[    0.846180]  s11: 0000000000d144e0 t3 : 0000000000000000 t4 : 0000000000000000
[    0.846616]  t5 : 0000000000000000 t6 : 0000000000000000
[    0.847204] status: 0000000200000020 badaddr: 00000000f0028053 cause: 0000000000000002
[    0.848219] Code: f06f ff5f 3823 fa11 0113 fb01 2e23 0201 0293 0000 (8053) f002
[    0.851016] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004

Signed-off-by: Yunhui Cui <cuiyunhui@bytedance.com>
Reviewed-by: Björn Töpel <bjorn@rivosinc.com>
Link: https://lore.kernel.org/r/20230912021349.28302-1-cuiyunhui@bytedance.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Yunhui Cui 2023-09-12 10:13:49 +08:00 committed by Palmer Dabbelt
parent 8cb22bec14
commit b8a03a6341
No known key found for this signature in database
GPG key ID: 2E1319F35FBB1889
1 changed files with 18 additions and 3 deletions
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21
arch/riscv/kernel/traps.c
View file

@ -34,7 +34,21 @@ int show_unhandled_signals = 1;
static DEFINE_SPINLOCK(die_lock);
static void dump_kernel_instr(const char *loglvl, struct pt_regs *regs)
static int copy_code(struct pt_regs *regs, u16 *val, const u16 *insns)
{
const void __user *uaddr = (__force const void __user *)insns;
if (!user_mode(regs))
return get_kernel_nofault(*val, insns);
/* The user space code from other tasks cannot be accessed. */
if (regs != task_pt_regs(current))
return -EPERM;
return copy_from_user_nofault(val, uaddr, sizeof(*val));
}
static void dump_instr(const char *loglvl, struct pt_regs *regs)
{
char str[sizeof("0000 ") * 12 + 2 + 1], *p = str;
const u16 *insns = (u16 *)instruction_pointer(regs);
@ -43,7 +57,7 @@ static void dump_kernel_instr(const char *loglvl, struct pt_regs *regs)
int i;
for (i = -10; i < 2; i++) {
bad = get_kernel_nofault(val, &insns[i]);
bad = copy_code(regs, &val, &insns[i]);
if (!bad) {
p += sprintf(p, i == 0 ? "(%04hx) " : "%04hx ", val);
} else {
@ -72,7 +86,7 @@ void die(struct pt_regs *regs, const char *str)
print_modules();
if (regs) {
show_regs(regs);
dump_kernel_instr(KERN_EMERG, regs);
dump_instr(KERN_EMERG, regs);
}
cause = regs ? regs->cause : -1;
@ -105,6 +119,7 @@ void do_trap(struct pt_regs *regs, int signo, int code, unsigned long addr)
print_vma_addr(KERN_CONT " in ", instruction_pointer(regs));
pr_cont("\n");
__show_regs(regs);
dump_instr(KERN_EMERG, regs);
}
force_sig_fault(signo, code, (void __user *)addr);