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powerpc/sstep: Add emulation support for ‘setb’ instruction 

This adds emulation support for the following instruction:
   * Set Boolean (setb)

Signed-off-by: Sathvika Vasireddy <sathvika@linux.vnet.ibm.com>
Tested-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Reviewed-by: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/7b735b0c898da0db2af8628a64df2f5114596f22.1620727160.git.sathvika@linux.vnet.ibm.com
This commit is contained in:
Sathvika Vasireddy 2021-05-11 07:18:32 -05:00 committed by Michael Ellerman
parent f259fb893c
commit 5b75bd763d
1 changed files with 22 additions and 0 deletions
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22
arch/powerpc/lib/sstep.c
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@ -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;