powerpc/ps3: Fix lv1 hcall assembly for ELFv2 calling convention

Stack-passed parameters begin at a different offset in the caller's
stack in the ELFv2 ABI.
Reported-by: Geoff Levand <geoff@infradead.org>
Fixes: 8c5fa3b5 ("powerpc/64: Make ELFv2 the default for big-endian builds")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Tested-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231227072405.63751-2-npiggin@gmail.com

arch/powerpc/include/asm/ppc_asm.h

@@ -201,11 +201,13 @@
 
 #ifdef CONFIG_PPC64_ELF_ABI_V2
 #define STK_GOT		24
-#define __STK_PARAM(i)	(32 + ((i)-3)*8)
+#define STK_PARAM_AREA	32
 #else
 #define STK_GOT		40
-#define __STK_PARAM(i)	(48 + ((i)-3)*8)
+#define STK_PARAM_AREA	48
 #endif
+
+#define __STK_PARAM(i)	(STK_PARAM_AREA + ((i)-3)*8)
 #define STK_PARAM(i)	__STK_PARAM(__REG_##i)
 
 #ifdef CONFIG_PPC64_ELF_ABI_V2

arch/powerpc/platforms/ps3/hvcall.S

@@ -714,7 +714,7 @@ _GLOBAL(_##API_NAME)				\
 	std	r4, 0(r11);			\
 	ld	r11, -16(r1);			\
 	std	r5, 0(r11);			\
-	ld	r11, 48+8*8(r1);		\
+	ld	r11, STK_PARAM_AREA+8*8(r1);	\
 	std	r6, 0(r11);			\
 						\
 	ld	r0, 16(r1);			\
@@ -746,22 +746,22 @@ _GLOBAL(_##API_NAME)				\
 	mflr	r0;				\
 	std	r0, 16(r1);			\
 						\
-	std	r10, 48+8*7(r1);		\
+	std	r10, STK_PARAM_AREA+8*7(r1);	\
 						\
 	li	r11, API_NUMBER;		\
 	lv1call;				\
 						\
-	ld	r11, 48+8*7(r1);		\
+	ld	r11, STK_PARAM_AREA+8*7(r1);	\
 	std	r4, 0(r11);			\
-	ld	r11, 48+8*8(r1);		\
+	ld	r11, STK_PARAM_AREA+8*8(r1);	\
 	std	r5, 0(r11);			\
-	ld	r11, 48+8*9(r1);		\
+	ld	r11, STK_PARAM_AREA+8*9(r1);	\
 	std	r6, 0(r11);			\
-	ld	r11, 48+8*10(r1);		\
+	ld	r11, STK_PARAM_AREA+8*10(r1);	\
 	std	r7, 0(r11);			\
-	ld	r11, 48+8*11(r1);		\
+	ld	r11, STK_PARAM_AREA+8*11(r1);	\
 	std	r8, 0(r11);			\
-	ld	r11, 48+8*12(r1);		\
+	ld	r11, STK_PARAM_AREA+8*12(r1);	\
 	std	r9, 0(r11);			\
 						\
 	ld	r0, 16(r1);			\
@@ -777,7 +777,7 @@ _GLOBAL(_##API_NAME)				\
 	li      r11, API_NUMBER;		\
 	lv1call;				\
 						\
-	ld	r11, 48+8*8(r1);		\
+	ld	r11, STK_PARAM_AREA+8*8(r1);	\
 	std	r4, 0(r11);			\
 						\
 	ld	r0, 16(r1);			\