From: Sathvika Vasireddy Date: Tue, 11 May 2021 12:18:32 +0000 (-0500) Subject: powerpc/sstep: Add emulation support for ‘setb’ instruction X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=5b75bd763d369e43e6d09e85eaea22fde37c0e89;p=linux.git powerpc/sstep: Add emulation support for ‘setb’ instruction This adds emulation support for the following instruction: * Set Boolean (setb) Signed-off-by: Sathvika Vasireddy Tested-by: Naveen N. Rao Reviewed-by: Segher Boessenkool Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/7b735b0c898da0db2af8628a64df2f5114596f22.1620727160.git.sathvika@linux.vnet.ibm.com --- diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c index 45bda25207557..aee42bcc775b6 100644 --- a/arch/powerpc/lib/sstep.c +++ b/arch/powerpc/lib/sstep.c @@ -1700,6 +1700,28 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs, op->val = regs->ccr & imm; goto compute_done; + case 128: /* setb */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + goto unknown_opcode; + /* + * 'ra' encodes the CR field number (bfa) in the top 3 bits. + * Since each CR field is 4 bits, + * we can simply mask off the bottom two bits (bfa * 4) + * to yield the first bit in the CR field. + */ + ra = ra & ~0x3; + /* 'val' stores bits of the CR field (bfa) */ + val = regs->ccr >> (CR0_SHIFT - ra); + /* checks if the LT bit of CR field (bfa) is set */ + if (val & 8) + op->val = -1; + /* checks if the GT bit of CR field (bfa) is set */ + else if (val & 4) + op->val = 1; + else + op->val = 0; + goto compute_done; + case 144: /* mtcrf */ op->type = COMPUTE + SETCC; imm = 0xf0000000UL;