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| author | Will Deacon <will.deacon@arm.com> | 2013-11-05 10:16:52 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2013-11-05 10:23:13 +0000 |
| commit | 122e2fa0d310d262cb85cf0b003032e5d2bc2ae7 (patch) | |
| tree | d6d40641150f867af562c1dfb84c3d17f05fdd72 /arch/arm64 | |
| parent | dab7ea360967f26337be1f26f56b12771da8c731 (diff) | |
| download | linux-122e2fa0d310d262cb85cf0b003032e5d2bc2ae7.tar.bz2 | |
arm64: module: ensure instruction is little-endian before manipulation
Relocations that require an instruction immediate to be re-encoded must
ensure that the instruction pattern is represented in a little-endian
format for the manipulation code to work correctly.
This patch converts the loaded instruction into native-endianess prior
to encoding and then converts back to little-endian byteorder before
updating memory.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Tested-by: Matthew Leach <matthew.leach@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/kernel/module.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c index ca0e3d55da99..2c28a6cf93e6 100644 --- a/arch/arm64/kernel/module.c +++ b/arch/arm64/kernel/module.c @@ -111,6 +111,9 @@ static u32 encode_insn_immediate(enum aarch64_imm_type type, u32 insn, u64 imm) u32 immlo, immhi, lomask, himask, mask; int shift; + /* The instruction stream is always little endian. */ + insn = le32_to_cpu(insn); + switch (type) { case INSN_IMM_MOVNZ: /* @@ -179,7 +182,7 @@ static u32 encode_insn_immediate(enum aarch64_imm_type type, u32 insn, u64 imm) insn &= ~(mask << shift); insn |= (imm & mask) << shift; - return insn; + return cpu_to_le32(insn); } static int reloc_insn_movw(enum aarch64_reloc_op op, void *place, u64 val, |