[PATCH v7 28/28] powerpc sstep: Add support for prefixed fixed-point arithmetic
From: Jordan Niethe <hidden>
Date: 2020-05-01 04:39:40
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
This adds emulation support for the following prefixed Fixed-Point Arithmetic instructions: * Prefixed Add Immediate (paddi) Reviewed-by: Balamuruhan S <redacted> Signed-off-by: Jordan Niethe <redacted> --- v3: Since we moved the prefixed loads/stores into the load/store switch statement it no longer makes sense to have paddi in there, so move it out. --- arch/powerpc/lib/sstep.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index d50fa2a78866..32e3ba742e55 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c@@ -1337,6 +1337,26 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs, switch (opcode) { #ifdef __powerpc64__ + case 1: + prefix_r = word & (1ul << 20); + ra = (suffix >> 16) & 0x1f; + rd = (suffix >> 21) & 0x1f; + op->reg = rd; + op->val = regs->gpr[rd]; + suffixopcode = suffix >> 26; + prefixtype = (word >> 24) & 0x3; + switch (prefixtype) { + case 2: + if (prefix_r && ra) + return 0; + switch (suffixopcode) { + case 14: /* paddi */ + op->type = COMPUTE | PREFIXED; + op->val = mlsd_8lsd_ea(word, suffix, regs); + goto compute_done; + } + } + break; case 2: /* tdi */ if (rd & trap_compare(regs->gpr[ra], (short) word)) goto trap;
--
2.17.1