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| author | Kumar Gala <galak@kernel.crashing.org> | 2007-11-19 21:35:29 -0600 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2007-12-11 13:57:16 -0600 |
| commit | c1469f13de275fc92b051328ea5764a32a5a43c9 (patch) | |
| tree | c978f788239e97c5c49f234a130e5da8e43e9310 | |
| parent | fd351b89205bc14f79af2e0d69f4198bcea1cf6a (diff) | |
| download | op-kernel-dev-c1469f13de275fc92b051328ea5764a32a5a43c9.zip op-kernel-dev-c1469f13de275fc92b051328ea5764a32a5a43c9.tar.gz | |
[POWERPC] Emulate isel (Integer Select) instruction
isel (Integer Select) is a new user space instruction in the
PowerISA 2.04 spec. Not all processors implement it so lets emulate
to ensure code built with isel will run everywhere.
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
| -rw-r--r-- | arch/powerpc/kernel/traps.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index 59c464e..cad6484 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -622,6 +622,9 @@ static void parse_fpe(struct pt_regs *regs) #define INST_POPCNTB 0x7c0000f4 #define INST_POPCNTB_MASK 0xfc0007fe +#define INST_ISEL 0x7c00001e +#define INST_ISEL_MASK 0xfc00003e + static int emulate_string_inst(struct pt_regs *regs, u32 instword) { u8 rT = (instword >> 21) & 0x1f; @@ -707,6 +710,23 @@ static int emulate_popcntb_inst(struct pt_regs *regs, u32 instword) return 0; } +static int emulate_isel(struct pt_regs *regs, u32 instword) +{ + u8 rT = (instword >> 21) & 0x1f; + u8 rA = (instword >> 16) & 0x1f; + u8 rB = (instword >> 11) & 0x1f; + u8 BC = (instword >> 6) & 0x1f; + u8 bit; + unsigned long tmp; + + tmp = (rA == 0) ? 0 : regs->gpr[rA]; + bit = (regs->ccr >> (31 - BC)) & 0x1; + + regs->gpr[rT] = bit ? tmp : regs->gpr[rB]; + + return 0; +} + static int emulate_instruction(struct pt_regs *regs) { u32 instword; @@ -749,6 +769,11 @@ static int emulate_instruction(struct pt_regs *regs) return emulate_popcntb_inst(regs, instword); } + /* Emulate isel (Integer Select) instruction */ + if ((instword & INST_ISEL_MASK) == INST_ISEL) { + return emulate_isel(regs, instword); + } + return -EINVAL; } |
