selftests/powerpc: Add 32-bit support to asm helpers

Add support for 32-bit builds to the asm helpers.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220627140239.2464900-6-mpe@ellerman.id.au

tools/testing/selftests/powerpc/include/basic_asm.h

@@ -5,6 +5,16 @@
 #include <ppc-asm.h>
 #include <asm/unistd.h>
 
+#ifdef __powerpc64__
+#define PPC_LL		ld
+#define PPC_STL		std
+#define PPC_STLU	stdu
+#else
+#define PPC_LL		lwz
+#define PPC_STL		stw
+#define PPC_STLU	stwu
+#endif
+
 #define LOAD_REG_IMMEDIATE(reg, expr) \
 	lis	reg, (expr)@highest;	\
 	ori	reg, reg, (expr)@higher;	\
@@ -14,16 +24,20 @@
 
 /*
  * Note: These macros assume that variables being stored on the stack are
- * doublewords, while this is usually the case it may not always be the
+ * sizeof(long), while this is usually the case it may not always be the
  * case for each use case.
  */
+#ifdef  __powerpc64__
+
+// ABIv2
 #if defined(_CALL_ELF) && _CALL_ELF == 2
 #define STACK_FRAME_MIN_SIZE 32
 #define STACK_FRAME_TOC_POS  24
 #define __STACK_FRAME_PARAM(_param)  (32 + ((_param)*8))
 #define __STACK_FRAME_LOCAL(_num_params, _var_num)  \
 	((STACK_FRAME_PARAM(_num_params)) + ((_var_num)*8))
-#else
+
+#else // ABIv1 below
 #define STACK_FRAME_MIN_SIZE 112
 #define STACK_FRAME_TOC_POS  40
 #define __STACK_FRAME_PARAM(i)  (48 + ((i)*8))
@@ -34,7 +48,24 @@
  */
 #define __STACK_FRAME_LOCAL(_num_params, _var_num)  \
 	(112 + ((_var_num)*8))
-#endif
+
+
+#endif // ABIv2
+
+// Common 64-bit
+#define STACK_FRAME_LR_POS   16
+#define STACK_FRAME_CR_POS   8
+
+#else // 32-bit below
+
+#define STACK_FRAME_MIN_SIZE 16
+#define STACK_FRAME_LR_POS   4
+
+#define __STACK_FRAME_PARAM(_param)  (STACK_FRAME_MIN_SIZE + ((_param)*4))
+#define __STACK_FRAME_LOCAL(_num_params, _var_num)  \
+	((STACK_FRAME_PARAM(_num_params)) + ((_var_num)*4))
+
+#endif // __powerpc64__
 
 /* Parameter x saved to the stack */
 #define STACK_FRAME_PARAM(var)    __STACK_FRAME_PARAM(var)
@@ -42,8 +73,6 @@
 /* Local variable x saved to the stack after x parameters */
 #define STACK_FRAME_LOCAL(num_params, var)    \
 	__STACK_FRAME_LOCAL(num_params, var)
-#define STACK_FRAME_LR_POS   16
-#define STACK_FRAME_CR_POS   8
 
 /*
  * It is very important to note here that _extra is the extra amount of
@@ -56,13 +85,13 @@
  * preprocessed incorrectly, hence r0.
  */
 #define PUSH_BASIC_STACK(_extra) \
-	mflr	r0; \
-	std	r0, STACK_FRAME_LR_POS(%r1); \
-	stdu	%r1, -(((_extra + 15) & ~15) + STACK_FRAME_MIN_SIZE)(%r1);
+	mflr	 r0; \
+	PPC_STL	 r0, STACK_FRAME_LR_POS(%r1); \
+	PPC_STLU %r1, -(((_extra + 15) & ~15) + STACK_FRAME_MIN_SIZE)(%r1);
 
 #define POP_BASIC_STACK(_extra) \
 	addi	%r1, %r1, (((_extra + 15) & ~15) + STACK_FRAME_MIN_SIZE); \
-	ld	r0, STACK_FRAME_LR_POS(%r1); \
+	PPC_LL	r0, STACK_FRAME_LR_POS(%r1); \
 	mtlr	r0;
 
 #endif /* _SELFTESTS_POWERPC_BASIC_ASM_H */