powerpc/tm: Fix GOT save offset for ABIv2

The r2 TOC/GOT save offset is 40 on ABIv1 and 24 on ABIv2.
Signed-off-by: Anton Blanchard <anton@samba.org>

arch/powerpc/include/asm/ppc_asm.h

@@ -190,8 +190,10 @@ END_FW_FTR_SECTION_IFSET(FW_FEATURE_SPLPAR)
 #define STK_REG(i)     __STK_REG(__REG_##i)
 
 #if defined(_CALL_ELF) && _CALL_ELF == 2
+#define STK_GOT		24
 #define __STK_PARAM(i)	(32 + ((i)-3)*8)
 #else
+#define STK_GOT		40
 #define __STK_PARAM(i)	(48 + ((i)-3)*8)
 #endif
 #define STK_PARAM(i)	__STK_PARAM(__REG_##i)

arch/powerpc/kernel/tm.S

@@ -107,7 +107,7 @@ _GLOBAL(tm_reclaim)
 	mflr	r0
 	stw	r6, 8(r1)
 	std	r0, 16(r1)
-	std	r2, 40(r1)
+	std	r2, STK_GOT(r1)
 	stdu	r1, -TM_FRAME_SIZE(r1)
 
 	/* We've a struct pt_regs at [r1+STACK_FRAME_OVERHEAD]. */
@@ -288,7 +288,7 @@ dont_backup_fp:
 	ld	r0, 16(r1)
 	mtcr	r4
 	mtlr	r0
-	ld	r2, 40(r1)
+	ld	r2, STK_GOT(r1)
 
 	/* Load system default DSCR */
 	ld	r4, DSCR_DEFAULT@toc(r2)
@@ -311,7 +311,7 @@ _GLOBAL(__tm_recheckpoint)
 	mflr	r0
 	stw	r5, 8(r1)
 	std	r0, 16(r1)
-	std	r2, 40(r1)
+	std	r2, STK_GOT(r1)
 	stdu	r1, -TM_FRAME_SIZE(r1)
 
 	/* We've a struct pt_regs at [r1+STACK_FRAME_OVERHEAD].
@@ -447,7 +447,7 @@ restore_gprs:
 	ld	r0, 16(r1)
 	mtcr	r4
 	mtlr	r0
-	ld	r2, 40(r1)
+	ld	r2, STK_GOT(r1)
 
 	/* Load system default DSCR */
 	ld	r4, DSCR_DEFAULT@toc(r2)