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Subject[RFC v5 27/57] objtool: arm64: Decode instruction triggering context switch
Date
Decode instructions that volutarily trigger an exception to change
the context of execution.

Suggested-by: Raphael Gault <raphael.gault@arm.com>
Signed-off-by: Julien Thierry <jthierry@redhat.com>
---
tools/objtool/arch/arm64/decode.c | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/tools/objtool/arch/arm64/decode.c b/tools/objtool/arch/arm64/decode.c
index 1609750cc4b9..5eba83c5d5bc 100644
--- a/tools/objtool/arch/arm64/decode.c
+++ b/tools/objtool/arch/arm64/decode.c
@@ -508,6 +508,10 @@ int arm_decode_except_gen(u32 instr, enum insn_type *type,
#define INSN_HVC 0b00000010
#define INSN_SMC 0b00000011
#define INSN_BRK 0b00100000
+#define INSN_HLT 0b01000000
+#define INSN_DCPS1 0b10100001
+#define INSN_DCPS2 0b10100010
+#define INSN_DCPS3 0b10100011

switch (decode_field) {
case INSN_SVC:
@@ -551,6 +555,13 @@ int arm_decode_except_gen(u32 instr, enum insn_type *type,
break;
}
return 0;
+ case INSN_HLT:
+ case INSN_DCPS1:
+ case INSN_DCPS2:
+ case INSN_DCPS3:
+ *immediate = imm16;
+ *type = INSN_CONTEXT_SWITCH;
+ return 0;
default:
return arm_decode_unknown(instr, type, immediate, ops_list);
}
--
2.21.0
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