diff mbox series

[v1,bpf-next,7/9] bpf: Add kernel/bpftool asm support for new instructions

Message ID 20240202162813.4184616-8-aspsk@isovalent.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series BPF static branches | expand

Checks

Context Check Description
bpf/vmtest-bpf-next-PR fail PR summary
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit fail Errors and warnings before: 21 this patch: 21
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 0 of 0 maintainers
netdev/build_clang fail Errors and warnings before: 41 this patch: 22
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn fail Errors and warnings before: 21 this patch: 21
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 45 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
bpf/vmtest-bpf-next-VM_Test-0 success Logs for Lint
bpf/vmtest-bpf-next-VM_Test-1 success Logs for ShellCheck
bpf/vmtest-bpf-next-VM_Test-2 success Logs for Unittests
bpf/vmtest-bpf-next-VM_Test-3 success Logs for Validate matrix.py
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bpf/vmtest-bpf-next-VM_Test-9 success Logs for s390x-gcc / build-release
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bpf/vmtest-bpf-next-VM_Test-21 fail Logs for x86_64-llvm-18 / build / build for x86_64 with llvm-18
bpf/vmtest-bpf-next-VM_Test-8 fail Logs for s390x-gcc / build / build for s390x with gcc
bpf/vmtest-bpf-next-VM_Test-23 success Logs for x86_64-llvm-18 / test
bpf/vmtest-bpf-next-VM_Test-24 success Logs for x86_64-llvm-18 / veristat
bpf/vmtest-bpf-next-VM_Test-22 fail Logs for x86_64-llvm-18 / build-release / build for x86_64 with llvm-18 and -O2 optimization
bpf/vmtest-bpf-next-VM_Test-18 fail Logs for x86_64-llvm-17 / build-release / build for x86_64 with llvm-17 and -O2 optimization

Commit Message

Anton Protopopov Feb. 2, 2024, 4:28 p.m. UTC
Add asm support for new JA* instructions so kernel verifier and bpftool
xlated insn dumps can have proper asm syntax.

Signed-off-by: Anton Protopopov <aspsk@isovalent.com>
---
 kernel/bpf/disasm.c | 33 +++++++++++++++++++++++++++------
 1 file changed, 27 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/kernel/bpf/disasm.c b/kernel/bpf/disasm.c
index 49940c26a227..5c8ee230ee5a 100644
--- a/kernel/bpf/disasm.c
+++ b/kernel/bpf/disasm.c
@@ -166,6 +166,30 @@  static bool is_movsx(const struct bpf_insn *insn)
 	       (insn->off == 8 || insn->off == 16 || insn->off == 32);
 }
 
+static void print_bpf_ja_insn(bpf_insn_print_t verbose,
+			      void *private_data,
+			      const struct bpf_insn *insn)
+{
+	bool jmp32 = insn->code == (BPF_JMP32 | BPF_JA);
+	int off = jmp32 ? insn->imm : insn->off;
+	const char *suffix = jmp32 ? "l" : "";
+	char op[16];
+
+	switch (insn->src_reg & BPF_STATIC_BRANCH_MASK) {
+	case BPF_STATIC_BRANCH_JA:
+		snprintf(op, sizeof(op), "goto%s_or_nop", suffix);
+		break;
+	case BPF_STATIC_BRANCH_JA | BPF_STATIC_BRANCH_NOP:
+		snprintf(op, sizeof(op), "nop_or_goto%s", suffix);
+		break;
+	default:
+		snprintf(op, sizeof(op), "goto%s", suffix);
+		break;
+	}
+
+	verbose(private_data, "(%02x) %s pc%+d\n", insn->code, op, off);
+}
+
 void print_bpf_insn(const struct bpf_insn_cbs *cbs,
 		    const struct bpf_insn *insn,
 		    bool allow_ptr_leaks)
@@ -319,12 +343,9 @@  void print_bpf_insn(const struct bpf_insn_cbs *cbs,
 							tmp, sizeof(tmp)),
 					insn->imm);
 			}
-		} else if (insn->code == (BPF_JMP | BPF_JA)) {
-			verbose(cbs->private_data, "(%02x) goto pc%+d\n",
-				insn->code, insn->off);
-		} else if (insn->code == (BPF_JMP32 | BPF_JA)) {
-			verbose(cbs->private_data, "(%02x) gotol pc%+d\n",
-				insn->code, insn->imm);
+		} else if (insn->code == (BPF_JMP | BPF_JA) ||
+			   insn->code == (BPF_JMP32 | BPF_JA)) {
+			print_bpf_ja_insn(verbose, cbs->private_data, insn);
 		} else if (insn->code == (BPF_JMP | BPF_EXIT)) {
 			verbose(cbs->private_data, "(%02x) exit\n", insn->code);
 		} else if (BPF_SRC(insn->code) == BPF_X) {