diff options
Diffstat (limited to 'arch/powerpc/lib/code-patching.c')
| -rw-r--r-- | arch/powerpc/lib/code-patching.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c index 638dde313cb..430f4c15d78 100644 --- a/arch/powerpc/lib/code-patching.c +++ b/arch/powerpc/lib/code-patching.c @@ -26,12 +26,18 @@ unsigned int create_branch(const unsigned int *addr, unsigned long target, int flags) { unsigned int instruction; + long offset; + offset = target; if (! (flags & BRANCH_ABSOLUTE)) - target = target - (unsigned long)addr; + offset = offset - (unsigned long)addr; + + /* Check we can represent the target in the instruction format */ + if (offset < -0x2000000 || offset > 0x1fffffc || offset & 0x3) + return 0; /* Mask out the flags and target, so they don't step on each other. */ - instruction = 0x48000000 | (flags & 0x3) | (target & 0x03FFFFFC); + instruction = 0x48000000 | (flags & 0x3) | (offset & 0x03FFFFFC); return instruction; } |