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selftests/bpf: use host CPU features in JIT disassembler

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Pass the host CPU name and feature string to
LLVMCreateDisasmCPUFeatures() instead of using LLVMCreateDisasm(), so
the disassembler correctly decodes CPU-specific instructions and
extensions such as RISC-V compressed and vector instructions.

Signed-off-by: Varun R Mallya <varunrmallya@gmail.com>
Reviewed-by: Björn Töpel <bjorn@kernel.org>
Link: https://lore.kernel.org/r/20260602205847.102825-2-varunrmallya@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Varun R Mallya 2026-06-03 02:28:46 +05:30 committed by Alexei Starovoitov
parent a1f1acf6a1
commit 557d0cc3f2
1 changed files with 11 additions and 2 deletions
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13
tools/testing/selftests/bpf/jit_disasm_helpers.c
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@ -96,10 +96,19 @@ static int disasm_one_func(FILE *text_out, uint8_t *image, __u32 len)
__u32 *label_pc, pc;
int i, cnt, err = 0;
char buf[64];
char *cpu, *features;
triple = LLVMGetDefaultTargetTriple();
ctx = LLVMCreateDisasm(triple, &labels, 0, NULL, lookup_symbol);
if (!ASSERT_OK_PTR(ctx, "LLVMCreateDisasm")) {
cpu = LLVMGetHostCPUName();
features = LLVMGetHostCPUFeatures();
ctx = LLVMCreateDisasmCPUFeatures(triple, cpu, features, &labels, 0, NULL, lookup_symbol);
LLVMDisposeMessage(cpu);
LLVMDisposeMessage(features);
if (!ASSERT_OK_PTR(ctx, "LLVMCreateDisasmCPUFeatures")) {
err = -EINVAL;
goto out;
}