diff mbox series

[RFC,bpf-next,05/14] bpf: Add kernel/bpftool asm support for new instructions

Message ID 20250318143318.656785-6-aspsk@isovalent.com (mailing list archive)
State RFC
Delegated to: BPF
Headers show
Series instruction sets and static keys | expand

Checks

Context Check Description
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bpf/vmtest-bpf-next-VM_Test-3 success Logs for Validate matrix.py
bpf/vmtest-bpf-next-PR fail PR summary
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bpf/vmtest-bpf-next-VM_Test-8 success Logs for aarch64-gcc / veristat-meta
bpf/vmtest-bpf-next-VM_Test-9 success Logs for s390x-gcc / GCC BPF
bpf/vmtest-bpf-next-VM_Test-10 fail Logs for s390x-gcc / build / build for s390x with gcc
bpf/vmtest-bpf-next-VM_Test-11 success Logs for s390x-gcc / build-release
bpf/vmtest-bpf-next-VM_Test-12 success Logs for s390x-gcc / veristat-kernel
bpf/vmtest-bpf-next-VM_Test-5 fail Logs for aarch64-gcc / build / build for aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-13 success Logs for s390x-gcc / veristat-meta
bpf/vmtest-bpf-next-VM_Test-4 success Logs for aarch64-gcc / GCC BPF
bpf/vmtest-bpf-next-VM_Test-14 success Logs for set-matrix
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bpf/vmtest-bpf-next-VM_Test-21 fail Logs for x86_64-gcc / build / build for x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-22 success Logs for x86_64-gcc / build-release
bpf/vmtest-bpf-next-VM_Test-23 success Logs for x86_64-gcc / veristat-kernel
bpf/vmtest-bpf-next-VM_Test-24 success Logs for x86_64-gcc / veristat-meta
bpf/vmtest-bpf-next-VM_Test-25 success Logs for x86_64-llvm-17 / GCC BPF
bpf/vmtest-bpf-next-VM_Test-26 fail Logs for x86_64-llvm-17 / build / build for x86_64 with llvm-17
bpf/vmtest-bpf-next-VM_Test-27 fail Logs for x86_64-llvm-17 / build-release / build for x86_64 with llvm-17-O2
bpf/vmtest-bpf-next-VM_Test-28 success Logs for x86_64-llvm-17 / veristat-kernel
bpf/vmtest-bpf-next-VM_Test-29 success Logs for x86_64-llvm-17 / veristat-meta
bpf/vmtest-bpf-next-VM_Test-30 success Logs for x86_64-llvm-18 / GCC BPF
bpf/vmtest-bpf-next-VM_Test-31 fail Logs for x86_64-llvm-18 / build / build for x86_64 with llvm-18
bpf/vmtest-bpf-next-VM_Test-32 fail Logs for x86_64-llvm-18 / build-release / build for x86_64 with llvm-18-O2
bpf/vmtest-bpf-next-VM_Test-33 success Logs for x86_64-llvm-18 / veristat-kernel
bpf/vmtest-bpf-next-VM_Test-34 success Logs for x86_64-llvm-18 / veristat-meta
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 success Errors and warnings before: 0 this patch: 0
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers warning 7 maintainers not CCed: sdf@fomichev.me jolsa@kernel.org song@kernel.org martin.lau@linux.dev haoluo@google.com john.fastabend@gmail.com kpsingh@kernel.org
netdev/build_clang success Errors and warnings before: 0 this patch: 0
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 success Errors and warnings before: 0 this patch: 0
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 49 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

Commit Message

Anton Protopopov March 18, 2025, 2:33 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 20883c6b1546..fd6e0e85412a 100644
--- a/kernel/bpf/disasm.c
+++ b/kernel/bpf/disasm.c
@@ -183,6 +183,30 @@  static inline bool is_mov_percpu_addr(const struct bpf_insn *insn)
 	return insn->code == (BPF_ALU64 | BPF_MOV | BPF_X) && insn->off == BPF_ADDR_PERCPU;
 }
 
+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)
@@ -355,16 +379,13 @@  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_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_JCOND) &&
 			   insn->src_reg == BPF_MAY_GOTO) {
 			verbose(cbs->private_data, "(%02x) may_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_EXIT)) {
 			verbose(cbs->private_data, "(%02x) exit\n", insn->code);
 		} else if (BPF_SRC(insn->code) == BPF_X) {