diff options
| author | James Clarke <jrtc27@jrtc27.com> | 2016-10-24 20:49:25 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-10-26 04:11:17 +0200 |
| commit | 9d9fa230206a3aea6ef451646c97122f04777983 (patch) | |
| tree | 75dd2bfcaaccb7a90c7e8b7dd4fd176640a06f03 /arch | |
| parent | sparc64: Fix illegal relative branches in hypervisor patched TLB code. (diff) | |
| download | linux-9d9fa230206a3aea6ef451646c97122f04777983.tar.xz linux-9d9fa230206a3aea6ef451646c97122f04777983.zip | |
sparc: Handle negative offsets in arch_jump_label_transform
Additionally, if the offset will overflow the immediate for a ba,pt
instruction, fall back on a standard ba to get an extra 3 bits.
Signed-off-by: James Clarke <jrtc27@jrtc27.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc/kernel/jump_label.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/arch/sparc/kernel/jump_label.c b/arch/sparc/kernel/jump_label.c index 59bbeff55024..07933b9e9ce0 100644 --- a/arch/sparc/kernel/jump_label.c +++ b/arch/sparc/kernel/jump_label.c @@ -13,19 +13,30 @@ void arch_jump_label_transform(struct jump_entry *entry, enum jump_label_type type) { - u32 val; u32 *insn = (u32 *) (unsigned long) entry->code; + u32 val; if (type == JUMP_LABEL_JMP) { s32 off = (s32)entry->target - (s32)entry->code; + bool use_v9_branch = false; + + BUG_ON(off & 3); #ifdef CONFIG_SPARC64 - /* ba,pt %xcc, . + (off << 2) */ - val = 0x10680000 | ((u32) off >> 2); -#else - /* ba . + (off << 2) */ - val = 0x10800000 | ((u32) off >> 2); + if (off <= 0xfffff && off >= -0x100000) + use_v9_branch = true; #endif + if (use_v9_branch) { + /* WDISP19 - target is . + immed << 2 */ + /* ba,pt %xcc, . + off */ + val = 0x10680000 | (((u32) off >> 2) & 0x7ffff); + } else { + /* WDISP22 - target is . + immed << 2 */ + BUG_ON(off > 0x7fffff); + BUG_ON(off < -0x800000); + /* ba . + off */ + val = 0x10800000 | (((u32) off >> 2) & 0x3fffff); + } } else { val = 0x01000000; } |