selftests/powerpc: Move core_busy_loop() into asm

There is at least one bug in core_busy_loop(), we use r0, but it's
not in the clobber list. We were getting away with this it seems but
that was luck.

It's also fishy to be touching the stack, even if we do it below the
stack pointer. It seems we get away with it, but looking at the
generated code that may just be luck.

So move it into assembler, do all the stack handling by hand. We create
a stack frame to save the non-volatiles in, so we can muck around with
them.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 0 insertions, 251 deletions

diff --git a/tools/testing/selftests/powerpc/pmu/ebb/ebb.c b/tools/testing/selftests/powerpc/pmu/ebb/ebb.c
index 1b46be9..b7ee607 100644
--- a/tools/testing/selftests/powerpc/pmu/ebb/ebb.c
+++ b/tools/testing/selftests/powerpc/pmu/ebb/ebb.c
@@ -335,257 +335,6 @@ void event_leader_ebb_init(struct event *e)
 	e->attr.pinned = 1;
 }
 
-int core_busy_loop(void)
-{
-	int rc;
-
-	asm volatile (
-		"li  3,  0x3030\n"
-		"std 3,  -96(1)\n"
-		"li  4,  0x4040\n"
-		"std 4,  -104(1)\n"
-		"li  5,  0x5050\n"
-		"std 5,  -112(1)\n"
-		"li  6,  0x6060\n"
-		"std 6,  -120(1)\n"
-		"li  7,  0x7070\n"
-		"std 7,  -128(1)\n"
-		"li  8,  0x0808\n"
-		"std 8,  -136(1)\n"
-		"li  9,  0x0909\n"
-		"std 9,  -144(1)\n"
-		"li  10, 0x1010\n"
-		"std 10, -152(1)\n"
-		"li  11, 0x1111\n"
-		"std 11, -160(1)\n"
-		"li  14, 0x1414\n"
-		"std 14, -168(1)\n"
-		"li  15, 0x1515\n"
-		"std 15, -176(1)\n"
-		"li  16, 0x1616\n"
-		"std 16, -184(1)\n"
-		"li  17, 0x1717\n"
-		"std 17, -192(1)\n"
-		"li  18, 0x1818\n"
-		"std 18, -200(1)\n"
-		"li  19, 0x1919\n"
-		"std 19, -208(1)\n"
-		"li  20, 0x2020\n"
-		"std 20, -216(1)\n"
-		"li  21, 0x2121\n"
-		"std 21, -224(1)\n"
-		"li  22, 0x2222\n"
-		"std 22, -232(1)\n"
-		"li  23, 0x2323\n"
-		"std 23, -240(1)\n"
-		"li  24, 0x2424\n"
-		"std 24, -248(1)\n"
-		"li  25, 0x2525\n"
-		"std 25, -256(1)\n"
-		"li  26, 0x2626\n"
-		"std 26, -264(1)\n"
-		"li  27, 0x2727\n"
-		"std 27, -272(1)\n"
-		"li  28, 0x2828\n"
-		"std 28, -280(1)\n"
-		"li  29, 0x2929\n"
-		"std 29, -288(1)\n"
-		"li  30, 0x3030\n"
-		"li  31, 0x3131\n"
-
-		"li    3,  0\n"
-		"0: "
-		"addi  3, 3, 1\n"
-		"cmpwi 3, 100\n"
-		"blt   0b\n"
-
-		/* Return 1 (fail) unless we get through all the checks */
-		"li	0, 1\n"
-
-		/* Check none of our registers have been corrupted */
-		"cmpwi  4,  0x4040\n"
-		"bne	1f\n"
-		"cmpwi  5,  0x5050\n"
-		"bne	1f\n"
-		"cmpwi  6,  0x6060\n"
-		"bne	1f\n"
-		"cmpwi  7,  0x7070\n"
-		"bne	1f\n"
-		"cmpwi  8,  0x0808\n"
-		"bne	1f\n"
-		"cmpwi  9,  0x0909\n"
-		"bne	1f\n"
-		"cmpwi  10, 0x1010\n"
-		"bne	1f\n"
-		"cmpwi  11, 0x1111\n"
-		"bne	1f\n"
-		"cmpwi  14, 0x1414\n"
-		"bne	1f\n"
-		"cmpwi  15, 0x1515\n"
-		"bne	1f\n"
-		"cmpwi  16, 0x1616\n"
-		"bne	1f\n"
-		"cmpwi  17, 0x1717\n"
-		"bne	1f\n"
-		"cmpwi  18, 0x1818\n"
-		"bne	1f\n"
-		"cmpwi  19, 0x1919\n"
-		"bne	1f\n"
-		"cmpwi  20, 0x2020\n"
-		"bne	1f\n"
-		"cmpwi  21, 0x2121\n"
-		"bne	1f\n"
-		"cmpwi  22, 0x2222\n"
-		"bne	1f\n"
-		"cmpwi  23, 0x2323\n"
-		"bne	1f\n"
-		"cmpwi  24, 0x2424\n"
-		"bne	1f\n"
-		"cmpwi  25, 0x2525\n"
-		"bne	1f\n"
-		"cmpwi  26, 0x2626\n"
-		"bne	1f\n"
-		"cmpwi  27, 0x2727\n"
-		"bne	1f\n"
-		"cmpwi  28, 0x2828\n"
-		"bne	1f\n"
-		"cmpwi  29, 0x2929\n"
-		"bne	1f\n"
-		"cmpwi  30, 0x3030\n"
-		"bne	1f\n"
-		"cmpwi  31, 0x3131\n"
-		"bne	1f\n"
-
-		/* Load junk into all our registers before we reload them from the stack. */
-		"li  3,  0xde\n"
-		"li  4,  0xad\n"
-		"li  5,  0xbe\n"
-		"li  6,  0xef\n"
-		"li  7,  0xde\n"
-		"li  8,  0xad\n"
-		"li  9,  0xbe\n"
-		"li  10, 0xef\n"
-		"li  11, 0xde\n"
-		"li  14, 0xad\n"
-		"li  15, 0xbe\n"
-		"li  16, 0xef\n"
-		"li  17, 0xde\n"
-		"li  18, 0xad\n"
-		"li  19, 0xbe\n"
-		"li  20, 0xef\n"
-		"li  21, 0xde\n"
-		"li  22, 0xad\n"
-		"li  23, 0xbe\n"
-		"li  24, 0xef\n"
-		"li  25, 0xde\n"
-		"li  26, 0xad\n"
-		"li  27, 0xbe\n"
-		"li  28, 0xef\n"
-		"li  29, 0xdd\n"
-
-		"ld     3,  -96(1)\n"
-		"cmpwi  3,  0x3030\n"
-		"bne	1f\n"
-		"ld     4,  -104(1)\n"
-		"cmpwi  4,  0x4040\n"
-		"bne	1f\n"
-		"ld     5,  -112(1)\n"
-		"cmpwi  5,  0x5050\n"
-		"bne	1f\n"
-		"ld     6,  -120(1)\n"
-		"cmpwi  6,  0x6060\n"
-		"bne	1f\n"
-		"ld     7,  -128(1)\n"
-		"cmpwi  7,  0x7070\n"
-		"bne	1f\n"
-		"ld     8,  -136(1)\n"
-		"cmpwi  8,  0x0808\n"
-		"bne	1f\n"
-		"ld     9,  -144(1)\n"
-		"cmpwi  9,  0x0909\n"
-		"bne	1f\n"
-		"ld     10, -152(1)\n"
-		"cmpwi  10, 0x1010\n"
-		"bne	1f\n"
-		"ld     11, -160(1)\n"
-		"cmpwi  11, 0x1111\n"
-		"bne	1f\n"
-		"ld     14, -168(1)\n"
-		"cmpwi  14, 0x1414\n"
-		"bne	1f\n"
-		"ld     15, -176(1)\n"
-		"cmpwi  15, 0x1515\n"
-		"bne	1f\n"
-		"ld     16, -184(1)\n"
-		"cmpwi  16, 0x1616\n"
-		"bne	1f\n"
-		"ld     17, -192(1)\n"
-		"cmpwi  17, 0x1717\n"
-		"bne	1f\n"
-		"ld     18, -200(1)\n"
-		"cmpwi  18, 0x1818\n"
-		"bne	1f\n"
-		"ld     19, -208(1)\n"
-		"cmpwi  19, 0x1919\n"
-		"bne	1f\n"
-		"ld     20, -216(1)\n"
-		"cmpwi  20, 0x2020\n"
-		"bne	1f\n"
-		"ld     21, -224(1)\n"
-		"cmpwi  21, 0x2121\n"
-		"bne	1f\n"
-		"ld     22, -232(1)\n"
-		"cmpwi  22, 0x2222\n"
-		"bne	1f\n"
-		"ld     23, -240(1)\n"
-		"cmpwi  23, 0x2323\n"
-		"bne	1f\n"
-		"ld     24, -248(1)\n"
-		"cmpwi  24, 0x2424\n"
-		"bne	1f\n"
-		"ld     25, -256(1)\n"
-		"cmpwi  25, 0x2525\n"
-		"bne	1f\n"
-		"ld     26, -264(1)\n"
-		"cmpwi  26, 0x2626\n"
-		"bne	1f\n"
-		"ld     27, -272(1)\n"
-		"cmpwi  27, 0x2727\n"
-		"bne	1f\n"
-		"ld     28, -280(1)\n"
-		"cmpwi  28, 0x2828\n"
-		"bne	1f\n"
-		"ld     29, -288(1)\n"
-		"cmpwi  29, 0x2929\n"
-		"bne	1f\n"
-
-		/* Load 0 (success) to return */
-		"li	0, 0\n"
-
-		"1: 	mr %0, 0\n"
-
-		: "=r" (rc)
-		: /* no inputs */
-		: "3", "4", "5", "6", "7", "8", "9", "10", "11", "14",
-		  "15", "16", "17", "18", "19", "20", "21", "22", "23",
-		   "24", "25", "26", "27", "28", "29", "30", "31",
-		   "memory"
-	);
-
-	return rc;
-}
-
-int core_busy_loop_with_freeze(void)
-{
-	int rc;
-
-	mtspr(SPRN_MMCR0, mfspr(SPRN_MMCR0) & ~MMCR0_FC);
-	rc = core_busy_loop();
-	mtspr(SPRN_MMCR0, mfspr(SPRN_MMCR0) |  MMCR0_FC);
-
-	return rc;
-}
-
 int ebb_child(union pipe read_pipe, union pipe write_pipe)
 {
 	struct event event;