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Subject[RFC v5 41/57] objtool: arm64: Decode FP/SIMD data processing instructions
Date
FP/SIMD data processing instructions cannot modify the stack or frame
pointer.

Simply acknowledge the corresponding opcodes are valid.

Suggested-by: Raphael Gault <raphael.gault@arm.com>
Signed-off-by: Julien Thierry <jthierry@redhat.com>
---
tools/objtool/arch/arm64/decode.c | 9 +++++++++
tools/objtool/arch/arm64/include/insn_decode.h | 4 ++++
2 files changed, 13 insertions(+)

diff --git a/tools/objtool/arch/arm64/decode.c b/tools/objtool/arch/arm64/decode.c
index bb1ba3b0997f..d35c2b58d309 100644
--- a/tools/objtool/arch/arm64/decode.c
+++ b/tools/objtool/arch/arm64/decode.c
@@ -130,11 +130,13 @@ static arm_decode_class aarch64_insn_class_decode_table[NR_INSN_CLASS] = {
[INSN_LD_ST_4] = arm_decode_ld_st,
[INSN_DP_REG_5] = arm_decode_dp_reg,
[INSN_LD_ST_6] = arm_decode_ld_st,
+ [INSN_DP_SIMD_7] = arm_decode_dp_simd,
[0b1000 ... INSN_DP_IMM] = arm_decode_dp_imm,
[0b1010 ... INSN_SYS_BRANCH] = arm_decode_br_sys,
[INSN_LD_ST_C] = arm_decode_ld_st,
[INSN_DP_REG_D] = arm_decode_dp_reg,
[INSN_LD_ST_E] = arm_decode_ld_st,
+ [INSN_DP_SIMD_F] = arm_decode_dp_simd,
};

/*
@@ -2746,3 +2748,10 @@ int arm_decode_dp_reg_3src(u32 instr, enum insn_type *type,
*type = INSN_OTHER;
return 0;
}
+
+int arm_decode_dp_simd(u32 instr, enum insn_type *type,
+ unsigned long *immediate, struct list_head *ops_list)
+{
+ *type = INSN_OTHER;
+ return 0;
+}
diff --git a/tools/objtool/arch/arm64/include/insn_decode.h b/tools/objtool/arch/arm64/include/insn_decode.h
index 8fb2f2b7564f..2bff4d7da007 100644
--- a/tools/objtool/arch/arm64/include/insn_decode.h
+++ b/tools/objtool/arch/arm64/include/insn_decode.h
@@ -16,6 +16,8 @@
#define INSN_LD_ST_E 0b1110 //0bx1x0
#define INSN_DP_REG_5 0b0101 //0bx101
#define INSN_DP_REG_D 0b1101 //0bx101
+#define INSN_DP_SIMD_7 0b0111 //0bx111
+#define INSN_DP_SIMD_F 0b1111 //0bx111

#define NR_INSN_CLASS 16
#define INSN_CLASS(opcode) (((opcode) >> 25) & (NR_INSN_CLASS - 1))
@@ -47,6 +49,8 @@ int arm_decode_br_sys(u32 instr, enum insn_type *type,
unsigned long *immediate, struct list_head *ops_list);
int arm_decode_ld_st(u32 instr, enum insn_type *type,
unsigned long *immediate, struct list_head *ops_list);
+int arm_decode_dp_simd(u32 instr, enum insn_type *type,
+ unsigned long *immediate, struct list_head *ops_list);
int arm_decode_unknown(u32 instr, enum insn_type *type,
unsigned long *immediate, struct list_head *ops_list);

--
2.21.0
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