selftests/bpf: verifier/xadd.c converted to inline assembly

Test verifier/xadd.c automatically converted to use inline assembly.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20230325025524.144043-42-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

3 files changed, 126 insertions, 97 deletions

diff --git a/tools/testing/selftests/bpf/prog_tests/verifier.c b/tools/testing/selftests/bpf/prog_tests/verifier.c
index 44350e328da29a..cd56fe52014594 100644
--- a/tools/testing/selftests/bpf/prog_tests/verifier.c
+++ b/tools/testing/selftests/bpf/prog_tests/verifier.c
@@ -38,6 +38,7 @@
 #include "verifier_value.skel.h"
 #include "verifier_value_or_null.skel.h"
 #include "verifier_var_off.skel.h"
+#include "verifier_xadd.skel.h"
 
 __maybe_unused
 static void run_tests_aux(const char *skel_name, skel_elf_bytes_fn elf_bytes_factory)
@@ -98,3 +99,4 @@ void test_verifier_value_adj_spill(void)      { RUN(verifier_value_adj_spill); }
 void test_verifier_value(void)                { RUN(verifier_value); }
 void test_verifier_value_or_null(void)        { RUN(verifier_value_or_null); }
 void test_verifier_var_off(void)              { RUN(verifier_var_off); }
+void test_verifier_xadd(void)                 { RUN(verifier_xadd); }
diff --git a/tools/testing/selftests/bpf/progs/verifier_xadd.c b/tools/testing/selftests/bpf/progs/verifier_xadd.c
new file mode 100644
index 00000000000000..05a0a55adb4512
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/verifier_xadd.c
@@ -0,0 +1,124 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Converted from tools/testing/selftests/bpf/verifier/xadd.c */
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+
+struct {
+	__uint(type, BPF_MAP_TYPE_HASH);
+	__uint(max_entries, 1);
+	__type(key, long long);
+	__type(value, long long);
+} map_hash_8b SEC(".maps");
+
+SEC("tc")
+__description("xadd/w check unaligned stack")
+__failure __msg("misaligned stack access off")
+__naked void xadd_w_check_unaligned_stack(void)
+{
+	asm volatile ("					\
+	r0 = 1;						\
+	*(u64*)(r10 - 8) = r0;				\
+	lock *(u32 *)(r10 - 7) += w0;			\
+	r0 = *(u64*)(r10 - 8);				\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("tc")
+__description("xadd/w check unaligned map")
+__failure __msg("misaligned value access off")
+__naked void xadd_w_check_unaligned_map(void)
+{
+	asm volatile ("					\
+	r1 = 0;						\
+	*(u64*)(r10 - 8) = r1;				\
+	r2 = r10;					\
+	r2 += -8;					\
+	r1 = %[map_hash_8b] ll;				\
+	call %[bpf_map_lookup_elem];			\
+	if r0 != 0 goto l0_%=;				\
+	exit;						\
+l0_%=:	r1 = 1;						\
+	lock *(u32 *)(r0 + 3) += w1;			\
+	r0 = *(u32*)(r0 + 3);				\
+	exit;						\
+"	:
+	: __imm(bpf_map_lookup_elem),
+	  __imm_addr(map_hash_8b)
+	: __clobber_all);
+}
+
+SEC("xdp")
+__description("xadd/w check unaligned pkt")
+__failure __msg("BPF_ATOMIC stores into R2 pkt is not allowed")
+__flag(BPF_F_ANY_ALIGNMENT)
+__naked void xadd_w_check_unaligned_pkt(void)
+{
+	asm volatile ("					\
+	r2 = *(u32*)(r1 + %[xdp_md_data]);		\
+	r3 = *(u32*)(r1 + %[xdp_md_data_end]);		\
+	r1 = r2;					\
+	r1 += 8;					\
+	if r1 < r3 goto l0_%=;				\
+	r0 = 99;					\
+	goto l1_%=;					\
+l0_%=:	r0 = 1;						\
+	r1 = 0;						\
+	*(u32*)(r2 + 0) = r1;				\
+	r1 = 0;						\
+	*(u32*)(r2 + 3) = r1;				\
+	lock *(u32 *)(r2 + 1) += w0;			\
+	lock *(u32 *)(r2 + 2) += w0;			\
+	r0 = *(u32*)(r2 + 1);				\
+l1_%=:	exit;						\
+"	:
+	: __imm_const(xdp_md_data, offsetof(struct xdp_md, data)),
+	  __imm_const(xdp_md_data_end, offsetof(struct xdp_md, data_end))
+	: __clobber_all);
+}
+
+SEC("tc")
+__description("xadd/w check whether src/dst got mangled, 1")
+__success __retval(3)
+__naked void src_dst_got_mangled_1(void)
+{
+	asm volatile ("					\
+	r0 = 1;						\
+	r6 = r0;					\
+	r7 = r10;					\
+	*(u64*)(r10 - 8) = r0;				\
+	lock *(u64 *)(r10 - 8) += r0;			\
+	lock *(u64 *)(r10 - 8) += r0;			\
+	if r6 != r0 goto l0_%=;				\
+	if r7 != r10 goto l0_%=;			\
+	r0 = *(u64*)(r10 - 8);				\
+	exit;						\
+l0_%=:	r0 = 42;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+SEC("tc")
+__description("xadd/w check whether src/dst got mangled, 2")
+__success __retval(3)
+__naked void src_dst_got_mangled_2(void)
+{
+	asm volatile ("					\
+	r0 = 1;						\
+	r6 = r0;					\
+	r7 = r10;					\
+	*(u32*)(r10 - 8) = r0;				\
+	lock *(u32 *)(r10 - 8) += w0;			\
+	lock *(u32 *)(r10 - 8) += w0;			\
+	if r6 != r0 goto l0_%=;				\
+	if r7 != r10 goto l0_%=;			\
+	r0 = *(u32*)(r10 - 8);				\
+	exit;						\
+l0_%=:	r0 = 42;					\
+	exit;						\
+"	::: __clobber_all);
+}
+
+char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/verifier/xadd.c b/tools/testing/selftests/bpf/verifier/xadd.c
deleted file mode 100644
index b96ef35268150b..00000000000000
--- a/tools/testing/selftests/bpf/verifier/xadd.c
+++ /dev/null
@@ -1,97 +0,0 @@
-{
-	"xadd/w check unaligned stack",
-	.insns = {
-	BPF_MOV64_IMM(BPF_REG_0, 1),
-	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -8),
-	BPF_ATOMIC_OP(BPF_W, BPF_ADD, BPF_REG_10, BPF_REG_0, -7),
-	BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
-	BPF_EXIT_INSN(),
-	},
-	.result = REJECT,
-	.errstr = "misaligned stack access off",
-	.prog_type = BPF_PROG_TYPE_SCHED_CLS,
-},
-{
-	"xadd/w check unaligned map",
-	.insns = {
-	BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
-	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
-	BPF_LD_MAP_FD(BPF_REG_1, 0),
-	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
-	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
-	BPF_EXIT_INSN(),
-	BPF_MOV64_IMM(BPF_REG_1, 1),
-	BPF_ATOMIC_OP(BPF_W, BPF_ADD, BPF_REG_0, BPF_REG_1, 3),
-	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_0, 3),
-	BPF_EXIT_INSN(),
-	},
-	.fixup_map_hash_8b = { 3 },
-	.result = REJECT,
-	.errstr = "misaligned value access off",
-	.prog_type = BPF_PROG_TYPE_SCHED_CLS,
-},
-{
-	"xadd/w check unaligned pkt",
-	.insns = {
-	BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1, offsetof(struct xdp_md, data)),
-	BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
-		    offsetof(struct xdp_md, data_end)),
-	BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),
-	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),
-	BPF_JMP_REG(BPF_JLT, BPF_REG_1, BPF_REG_3, 2),
-	BPF_MOV64_IMM(BPF_REG_0, 99),
-	BPF_JMP_IMM(BPF_JA, 0, 0, 6),
-	BPF_MOV64_IMM(BPF_REG_0, 1),
-	BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
-	BPF_ST_MEM(BPF_W, BPF_REG_2, 3, 0),
-	BPF_ATOMIC_OP(BPF_W, BPF_ADD, BPF_REG_2, BPF_REG_0, 1),
-	BPF_ATOMIC_OP(BPF_W, BPF_ADD, BPF_REG_2, BPF_REG_0, 2),
-	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_2, 1),
-	BPF_EXIT_INSN(),
-	},
-	.result = REJECT,
-	.errstr = "BPF_ATOMIC stores into R2 pkt is not allowed",
-	.prog_type = BPF_PROG_TYPE_XDP,
-	.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
-},
-{
-	"xadd/w check whether src/dst got mangled, 1",
-	.insns = {
-	BPF_MOV64_IMM(BPF_REG_0, 1),
-	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
-	BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
-	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -8),
-	BPF_ATOMIC_OP(BPF_DW, BPF_ADD, BPF_REG_10, BPF_REG_0, -8),
-	BPF_ATOMIC_OP(BPF_DW, BPF_ADD, BPF_REG_10, BPF_REG_0, -8),
-	BPF_JMP_REG(BPF_JNE, BPF_REG_6, BPF_REG_0, 3),
-	BPF_JMP_REG(BPF_JNE, BPF_REG_7, BPF_REG_10, 2),
-	BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
-	BPF_EXIT_INSN(),
-	BPF_MOV64_IMM(BPF_REG_0, 42),
-	BPF_EXIT_INSN(),
-	},
-	.result = ACCEPT,
-	.prog_type = BPF_PROG_TYPE_SCHED_CLS,
-	.retval = 3,
-},
-{
-	"xadd/w check whether src/dst got mangled, 2",
-	.insns = {
-	BPF_MOV64_IMM(BPF_REG_0, 1),
-	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
-	BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
-	BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_0, -8),
-	BPF_ATOMIC_OP(BPF_W, BPF_ADD, BPF_REG_10, BPF_REG_0, -8),
-	BPF_ATOMIC_OP(BPF_W, BPF_ADD, BPF_REG_10, BPF_REG_0, -8),
-	BPF_JMP_REG(BPF_JNE, BPF_REG_6, BPF_REG_0, 3),
-	BPF_JMP_REG(BPF_JNE, BPF_REG_7, BPF_REG_10, 2),
-	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_10, -8),
-	BPF_EXIT_INSN(),
-	BPF_MOV64_IMM(BPF_REG_0, 42),
-	BPF_EXIT_INSN(),
-	},
-	.result = ACCEPT,
-	.prog_type = BPF_PROG_TYPE_SCHED_CLS,
-	.retval = 3,
-},