Commit 0357f29d authored by Peilin Ye's avatar Peilin Ye Committed by Alexei Starovoitov
Browse files

selftests/bpf: Verify zero-extension behavior in load-acquire tests 



Verify that 8-, 16- and 32-bit load-acquires are zero-extending by using
immediate values with their highest bit set.  Do the same for the 64-bit
variant to keep the style consistent.

Acked-by: default avatarBjörn Töpel <bjorn@kernel.org>
Reviewed-by: default avatarPu Lehui <pulehui@huawei.com>
Tested-by: Björn Töpel <bjorn@rivosinc.com> # QEMU/RVA23
Signed-off-by: default avatarPeilin Ye <yepeilin@google.com>
Link: https://lore.kernel.org/r/11097fd515f10308b3941469ee4c86cb8872db3f.1746588351.git.yepeilin@google.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 6e492ffc

tools/testing/selftests/bpf/progs/verifier_load_acquire.c

+4 −4
Original line number Diff line number Diff line
@@ -15,7 +15,7 @@ __naked void load_acquire_8(void) 
{

	asm volatile (

	"r0 = 0;"

	"w1 = 0x12;"

	"w1 = 0xfe;"

	"*(u8 *)(r10 - 1) = w1;"

	".8byte %[load_acquire_insn];" // w2 = load_acquire((u8 *)(r10 - 1));

	"if r2 == r1 goto 1f;"
@@ -35,7 +35,7 @@ __naked void load_acquire_16(void) 
{

	asm volatile (

	"r0 = 0;"

	"w1 = 0x1234;"

	"w1 = 0xfedc;"

	"*(u16 *)(r10 - 2) = w1;"

	".8byte %[load_acquire_insn];" // w2 = load_acquire((u16 *)(r10 - 2));

	"if r2 == r1 goto 1f;"
@@ -55,7 +55,7 @@ __naked void load_acquire_32(void) 
{

	asm volatile (

	"r0 = 0;"

	"w1 = 0x12345678;"

	"w1 = 0xfedcba09;"

	"*(u32 *)(r10 - 4) = w1;"

	".8byte %[load_acquire_insn];" // w2 = load_acquire((u32 *)(r10 - 4));

	"if r2 == r1 goto 1f;"
@@ -75,7 +75,7 @@ __naked void load_acquire_64(void) 
{

	asm volatile (

	"r0 = 0;"

	"r1 = 0x1234567890abcdef ll;"

	"r1 = 0xfedcba0987654321 ll;"

	"*(u64 *)(r10 - 8) = r1;"

	".8byte %[load_acquire_insn];" // r2 = load_acquire((u64 *)(r10 - 8));

	"if r2 == r1 goto 1f;"