Add modsw and moduw instruction emulation support to analyse_instr.
modsw is an x-form instruction that calculates signed modulo of values
stored in registers. moduw is similar to modsw but it works with
unsigned values.
Signed-off-by: PrasannaKumar Muralidharan <prasannatsmku...@gmail.com>
Reviewed-by: Naveen N. Rao <naveen.n....@linux.vnet.ibm.com>
---
Changes in v3:
Move 'Changes in v2' after '---' so that it won't appear in commit message
Changes in v2:
Don't update CR register as the instruction does not touch that
Arrange extended opcode in numerical order
arch/powerpc/lib/sstep.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index 9c78a9c..b0acdbc 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -1128,6 +1128,11 @@ int __kprobes analyse_instr(struct instruction_op *op,
struct pt_regs *regs,
case 266: /* add */
regs->gpr[rd] = regs->gpr[ra] + regs->gpr[rb];
goto arith_done;
+
+ case 267: /* moduw */
+ regs->gpr[rd] = (unsigned int) regs->gpr[ra] %
+ (unsigned int) regs->gpr[rb];
+ goto instr_done;
#ifdef __powerpc64__
case 457: /* divdu */
regs->gpr[rd] = regs->gpr[ra] / regs->gpr[rb];
@@ -1148,6 +1153,10 @@ int __kprobes analyse_instr(struct instruction_op *op,
struct pt_regs *regs,
(int) regs->gpr[rb];
goto arith_done;
+ case 779: /* modsw */
+ regs->gpr[rd] = (int) regs->gpr[ra] %
+ (int) regs->gpr[rb];
+ goto instr_done;
/*
* Logical instructions
--
2.9.3
