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| author | Mark Brown <broonie@kernel.org> | 2014-09-16 17:42:33 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2014-09-25 15:32:48 +0100 |
| commit | a9ae04c9faeff1ad617e4f4492af3143d8c5ad9b (patch) | |
| tree | 62653998e9b5f2519ab235c2db8463b2ab30e2de /arch/arm64/include | |
| parent | 1059c6bf8534acda249e7e65c81e7696fb074dc1 (diff) | |
| download | blackbird-op-linux-a9ae04c9faeff1ad617e4f4492af3143d8c5ad9b.tar.gz blackbird-op-linux-a9ae04c9faeff1ad617e4f4492af3143d8c5ad9b.zip | |
arm64: insn: Add return statements after BUG_ON()
Following a recent series of enhancements to the insn code the ARMv8
allnoconfig build has been generating a large number of warnings in the
form of:
arch/arm64/kernel/insn.c:689:8: warning: 'insn' may be used uninitialized in this function [-Wmaybe-uninitialized]
This is because BUG() and related macros can be compiled out so we get
execution paths which normally result in a panic compiling out to noops
instead.
I wasn't able to immediately identify a sensible return value to use in
these cases so just return AARCH64_BREAK_FAULT - this is all "should
never happen" code so hopefully it never has a practical impact.
Signed-off-by: Mark Brown <broonie@kernel.org>
[catalin.marinas@arm.com: AARCH64_BREAK_FAULT definition contributed by Daniel Borkmann]
[catalin.marinas@arm.com: replace return 0 with AARCH64_BREAK_FAULT]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/debug-monitors.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/debug-monitors.h b/arch/arm64/include/asm/debug-monitors.h index 7fb343779498..230132f9a7d8 100644 --- a/arch/arm64/include/asm/debug-monitors.h +++ b/arch/arm64/include/asm/debug-monitors.h @@ -48,9 +48,11 @@ /* * #imm16 values used for BRK instruction generation * Allowed values for kgbd are 0x400 - 0x7ff + * 0x100: for triggering a fault on purpose (reserved) * 0x400: for dynamic BRK instruction * 0x401: for compile time BRK instruction */ +#define FAULT_BRK_IMM 0x100 #define KGDB_DYN_DGB_BRK_IMM 0x400 #define KDBG_COMPILED_DBG_BRK_IMM 0x401 @@ -61,6 +63,12 @@ #define AARCH64_BREAK_MON 0xd4200000 /* + * BRK instruction for provoking a fault on purpose + * Unlike kgdb, #imm16 value with unallocated handler is used for faulting. + */ +#define AARCH64_BREAK_FAULT (AARCH64_BREAK_MON | (FAULT_BRK_IMM << 5)) + +/* * Extract byte from BRK instruction */ #define KGDB_DYN_DGB_BRK_INS_BYTE(x) \ |
