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| author | Matt Fleming <matt@console-pimps.org> | 2009-08-16 20:54:48 (GMT) |
|---|---|---|
| committer | Matt Fleming <matt@console-pimps.org> | 2009-08-21 12:02:44 (GMT) |
| commit | b344e24a8e8ceda83d1285d22e3e5baf4f5e42d3 (patch) | |
| tree | 4b9500264a797736b48b59c3f0977277ace53386 /arch/sh/kernel/traps.c | |
| parent | 97efbbd5886e27b61c19c77d41f6491f5d96fbd0 (diff) | |
| download | linux-b344e24a8e8ceda83d1285d22e3e5baf4f5e42d3.tar.xz | |
sh: unwinder: Introduce UNWINDER_BUG() and UNWINDER_BUG_ON()
We can't assume that if we execute the unwinder code and the unwinder
was already running that it has faulted. Clearly two kernel threads can
invoke the unwinder at the same time and may be running simultaneously.
The previous approach used BUG() and BUG_ON() in the unwinder code to
detect whether the unwinder was incapable of unwinding the stack, and
that the next available unwinder should be used instead. A better
approach is to explicitly invoke a trap handler to switch unwinders when
the current unwinder cannot continue.
Signed-off-by: Matt Fleming <matt@console-pimps.org>
Diffstat (limited to 'arch/sh/kernel/traps.c')
| -rw-r--r-- | arch/sh/kernel/traps.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/sh/kernel/traps.c b/arch/sh/kernel/traps.c index b3e0067..881b9a3 100644 --- a/arch/sh/kernel/traps.c +++ b/arch/sh/kernel/traps.c @@ -8,7 +8,7 @@ #include <asm/system.h> #ifdef CONFIG_BUG -static void handle_BUG(struct pt_regs *regs) +void handle_BUG(struct pt_regs *regs) { enum bug_trap_type tt; tt = report_bug(regs->pc, regs); @@ -29,7 +29,10 @@ int is_valid_bugaddr(unsigned long addr) if (probe_kernel_address((insn_size_t *)addr, opcode)) return 0; - return opcode == TRAPA_BUG_OPCODE; + if (opcode == TRAPA_BUG_OPCODE || opcode == TRAPA_UNWINDER_BUG_OPCODE) + return 1; + + return 0; } #endif |