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LoongArch: Refactor bug_handler() implementation

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1. Early return for user mode triggered exception with all types.
2. Give a chance to call fixup_exception() for default types (like
   S390).

Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: maoxiaochuan <maoxiaochuan@loongson.cn>
This commit is contained in:
Huacai Chen
2025-02-13 14:28:31 +08:00
committed by maoxiaochuan
parent fc88603832
commit c1626e9130
1 changed files with 10 additions and 3 deletions
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arch/loongarch/kernel/traps.c
+10 -3
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@@ -597,17 +597,24 @@ int is_valid_bugaddr(unsigned long addr)
static void bug_handler(struct pt_regs *regs)
{
if (user_mode(regs)) {
force_sig(SIGTRAP);
return;
}
switch (report_bug(regs->csr_era, regs)) {
case BUG_TRAP_TYPE_BUG:
case BUG_TRAP_TYPE_NONE:
die_if_kernel("Oops - BUG", regs);
force_sig(SIGTRAP);
die("Oops - BUG", regs);
break;
case BUG_TRAP_TYPE_WARN:
/* Skip the BUG instruction and continue */
regs->csr_era += LOONGARCH_INSN_SIZE;
break;
default:
if (!fixup_exception(regs))
die("Oops - BUG", regs);
}
}