diff options
| author | Anton Blanchard <anton@samba.org> | 2017-09-20 02:32:19 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-09-20 06:30:09 +0300 |
| commit | 1575fe06f6b1d156ed31fb22c8631d49d79751d8 (patch) | |
| tree | aed176e7eb68819db1178de75db6959d83d79566 /arch/powerpc/lib | |
| parent | 5bcaa4cc41923871777c3d13906267e812775094 (diff) | |
| download | linux-1575fe06f6b1d156ed31fb22c8631d49d79751d8.tar.xz | |
powerpc/sstep: mullw should calculate a 64 bit signed result
mullw should do a 32 bit signed multiply and create a 64 bit signed
result. It currently truncates the result to 32 bits.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/lib')
| -rw-r--r-- | arch/powerpc/lib/sstep.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c index c4cda1afb49d..5e8418c28bd8 100644 --- a/arch/powerpc/lib/sstep.c +++ b/arch/powerpc/lib/sstep.c @@ -1651,8 +1651,9 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs, goto arith_done; case 235: /* mullw */ - op->val = (unsigned int) regs->gpr[ra] * - (unsigned int) regs->gpr[rb]; + op->val = (long)(int) regs->gpr[ra] * + (int) regs->gpr[rb]; + goto arith_done; case 266: /* add */ |