mono-core/mono-core-ppc64le-swr11r12.diff

Switch ppc_r11 with ppc_r12

This is a preliminary patch for ppc64le ELFv2 support.  That one requires
r12 to hold a functions address at calls to normal (global) C functions.
As is r12 is also used by mini for its IMT_REG, VTABLE_REG and RGCTX_REG
to pass around values to functions outside the normal argument registers
(ugh!), so there's a conflict.  This mechanical (by sed) patch simply switches
ppc_r11 and ppc_r12 everywhere, r11 doesn't have any special use in the ABI.

Index: mono-3.4.0/mono/arch/ppc/ppc-codegen.h
===================================================================
--- mono-3.4.0.orig/mono/arch/ppc/ppc-codegen.h
+++ mono-3.4.0/mono/arch/ppc/ppc-codegen.h
@@ -810,9 +810,9 @@ my and Ximian's copyright to this code.
 #define ppc_load_func(c,D,V)	      ppc_load_sequence ((c), (D), (V))
 #else
 #define ppc_load_func(c,D,v) G_STMT_START { \
-		ppc_load_sequence ((c), ppc_r11, (guint64)(gsize)(v));	\
-		ppc_ldptr ((c), ppc_r2, sizeof (gpointer), ppc_r11);	\
-		ppc_ldptr ((c), (D), 0, ppc_r11);	\
+		ppc_load_sequence ((c), ppc_r12, (guint64)(gsize)(v));	\
+		ppc_ldptr ((c), ppc_r2, sizeof (gpointer), ppc_r12);	\
+		ppc_ldptr ((c), (D), 0, ppc_r12);	\
 	} G_STMT_END
 #endif
 
Index: mono-3.4.0/mono/mini/aot-compiler.c
===================================================================
--- mono-3.4.0.orig/mono/mini/aot-compiler.c
+++ mono-3.4.0/mono/mini/aot-compiler.c
@@ -1842,14 +1842,14 @@ arch_emit_imt_thunk (MonoAotCompile *acf
 	code = buf;
 
 	/* Load the mscorlib got address */
-	ppc_ldptr (code, ppc_r11, sizeof (gpointer), ppc_r30);
+	ppc_ldptr (code, ppc_r12, sizeof (gpointer), ppc_r30);
 	/* Load the parameter from the GOT */
 	ppc_load (code, ppc_r0, offset * sizeof (gpointer));
-	ppc_ldptr_indexed (code, ppc_r11, ppc_r11, ppc_r0);
+	ppc_ldptr_indexed (code, ppc_r12, ppc_r12, ppc_r0);
 
 	/* Load and check key */
 	labels [1] = code;
-	ppc_ldptr (code, ppc_r0, 0, ppc_r11);
+	ppc_ldptr (code, ppc_r0, 0, ppc_r12);
 	ppc_cmp (code, 0, sizeof (gpointer) == 8 ? 1 : 0, ppc_r0, MONO_ARCH_IMT_REG);
 	labels [2] = code;
 	ppc_bc (code, PPC_BR_TRUE, PPC_BR_EQ, 0);
@@ -1860,18 +1860,18 @@ arch_emit_imt_thunk (MonoAotCompile *acf
 	ppc_bc (code, PPC_BR_TRUE, PPC_BR_EQ, 0);
 
 	/* Loop footer */
-	ppc_addi (code, ppc_r11, ppc_r11, 2 * sizeof (gpointer));
+	ppc_addi (code, ppc_r12, ppc_r12, 2 * sizeof (gpointer));
 	labels [4] = code;
 	ppc_b (code, 0);
 	mono_ppc_patch (labels [4], labels [1]);
 
 	/* Match */
 	mono_ppc_patch (labels [2], code);
-	ppc_ldptr (code, ppc_r11, sizeof (gpointer), ppc_r11);
-	/* r11 now contains the value of the vtable slot */
+	ppc_ldptr (code, ppc_r12, sizeof (gpointer), ppc_r12);
+	/* r12 now contains the value of the vtable slot */
 	/* this is not a function descriptor on ppc64 */
-	ppc_ldptr (code, ppc_r11, 0, ppc_r11);
-	ppc_mtctr (code, ppc_r11);
+	ppc_ldptr (code, ppc_r12, 0, ppc_r12);
+	ppc_mtctr (code, ppc_r12);
 	ppc_bcctr (code, PPC_BR_ALWAYS, 0);
 
 	/* Fail */
Index: mono-3.4.0/mono/mini/exceptions-ppc.c
===================================================================
--- mono-3.4.0.orig/mono/mini/exceptions-ppc.c
+++ mono-3.4.0/mono/mini/exceptions-ppc.c
@@ -381,13 +381,13 @@ mono_arch_get_throw_exception_generic (i
 
 		if (aot) {
 			code = mono_arch_emit_load_aotconst (start, code, &ji, MONO_PATCH_INFO_IMAGE, mono_defaults.corlib);
-			ppc_mr (code, ppc_r3, ppc_r11);
+			ppc_mr (code, ppc_r3, ppc_r12);
 			code = mono_arch_emit_load_aotconst (start, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_exception_from_token");
 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
-			ppc_ldptr (code, ppc_r2, sizeof (gpointer), ppc_r11);
-			ppc_ldptr (code, ppc_r11, 0, ppc_r11);
+			ppc_ldptr (code, ppc_r2, sizeof (gpointer), ppc_r12);
+			ppc_ldptr (code, ppc_r12, 0, ppc_r12);
 #endif
-			ppc_mtctr (code, ppc_r11);
+			ppc_mtctr (code, ppc_r12);
 			ppc_bcctrl (code, PPC_BR_ALWAYS, 0);
 		} else {
 			ppc_load (code, ppc_r3, (gulong)mono_defaults.corlib);
@@ -420,10 +420,10 @@ mono_arch_get_throw_exception_generic (i
 		code = mono_arch_emit_load_got_addr (start, code, NULL, &ji);
 		code = mono_arch_emit_load_aotconst (start, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_ppc_throw_exception");
 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
-		ppc_ldptr (code, ppc_r2, sizeof (gpointer), ppc_r11);
-		ppc_ldptr (code, ppc_r11, 0, ppc_r11);
+		ppc_ldptr (code, ppc_r2, sizeof (gpointer), ppc_r12);
+		ppc_ldptr (code, ppc_r12, 0, ppc_r12);
 #endif
-		ppc_mtctr (code, ppc_r11);
+		ppc_mtctr (code, ppc_r12);
 		ppc_bcctrl (code, PPC_BR_ALWAYS, 0);
 	} else {
 		ppc_load_func (code, ppc_r0, mono_ppc_throw_exception);
Index: mono-3.4.0/mono/mini/mini-mips.c
===================================================================
--- mono-3.4.0.orig/mono/mini/mini-mips.c
+++ mono-3.4.0/mono/mini/mini-mips.c
@@ -3298,8 +3298,8 @@ emit_reserve_param_area (MonoCompile *cf
 	if (ppc_is_imm16 (-size)) {
 		ppc_stwu (code, ppc_r0, -size, ppc_sp);
 	} else {
-		ppc_load (code, ppc_r11, -size);
-		ppc_stwux (code, ppc_r0, ppc_sp, ppc_r11);
+		ppc_load (code, ppc_r12, -size);
+		ppc_stwux (code, ppc_r0, ppc_sp, ppc_r12);
 	}
 #endif
 	return code;
@@ -3320,8 +3320,8 @@ emit_unreserve_param_area (MonoCompile *
 	if (ppc_is_imm16 (size)) {
 		ppc_stwu (code, ppc_r0, size, ppc_sp);
 	} else {
-		ppc_load (code, ppc_r11, size);
-		ppc_stwux (code, ppc_r0, ppc_sp, ppc_r11);
+		ppc_load (code, ppc_r12, size);
+		ppc_stwux (code, ppc_r0, ppc_sp, ppc_r12);
 	}
 #endif
 	return code;
@@ -3712,8 +3712,8 @@ mono_arch_output_basic_block (MonoCompil
 		case OP_DIV_IMM:
 			g_assert_not_reached ();
 #if 0
-			ppc_load (code, ppc_r11, ins->inst_imm);
-			ppc_divwod (code, ins->dreg, ins->sreg1, ppc_r11);
+			ppc_load (code, ppc_r12, ins->inst_imm);
+			ppc_divwod (code, ins->dreg, ins->sreg1, ppc_r12);
 			ppc_mfspr (code, ppc_r0, ppc_xer);
 			ppc_andisd (code, ppc_r0, ppc_r0, (1<<14));
 			/* FIXME: use OverflowException for 0x80000000/-1 */
Index: mono-3.4.0/mono/mini/mini-ppc.c
===================================================================
--- mono-3.4.0.orig/mono/mini/mini-ppc.c
+++ mono-3.4.0/mono/mini/mini-ppc.c
@@ -103,11 +103,11 @@ offsets_from_pthread_key (guint32 key, i
 /* FIXME: ensure the sc call preserves all but r3 */
 #define emit_darwing4_tls(code,dreg,key) do {\
 		int off1 = 0x48 + key * sizeof (gpointer);	\
-		if ((dreg) != ppc_r3) ppc_mr ((code), ppc_r11, ppc_r3);	\
+		if ((dreg) != ppc_r3) ppc_mr ((code), ppc_r12, ppc_r3);	\
 		ppc_li ((code), ppc_r0, 0x7FF2);	\
 		ppc_sc ((code));	\
 		ppc_lwz ((code), (dreg), off1, ppc_r3);	\
-		if ((dreg) != ppc_r3) ppc_mr ((code), ppc_r3, ppc_r11);	\
+		if ((dreg) != ppc_r3) ppc_mr ((code), ppc_r3, ppc_r12);	\
 	} while (0);
 
 #ifdef PPC_THREAD_PTR_REG
@@ -118,8 +118,8 @@ offsets_from_pthread_key (guint32 key, i
 			ppc_ldptr ((code), (dreg), off1, PPC_THREAD_PTR_REG);	\
 		} else { \
 			int off3 = (off2 + 1) > 1; \
-			ppc_addis ((code), ppc_r11, PPC_THREAD_PTR_REG, off3); \
-			ppc_ldptr ((code), (dreg), off1, ppc_r11);	\
+			ppc_addis ((code), ppc_r12, PPC_THREAD_PTR_REG, off3); \
+			ppc_ldptr ((code), (dreg), off1, ppc_r12);	\
 		} \
 	} while (0);
 #else
@@ -190,29 +190,29 @@ emit_memcpy (guint8 *code, int size, int
 
 		ppc_load (code, ppc_r0, shifted);
 		ppc_mtctr (code, ppc_r0);
-		//g_assert (sreg == ppc_r11);
-		ppc_addi (code, ppc_r12, dreg, (doffset - sizeof (gpointer)));
-		ppc_addi (code, ppc_r11, sreg, (soffset - sizeof (gpointer)));
+		//g_assert (sreg == ppc_r12);
+		ppc_addi (code, ppc_r11, dreg, (doffset - sizeof (gpointer)));
+		ppc_addi (code, ppc_r12, sreg, (soffset - sizeof (gpointer)));
 		copy_loop_start = code;
-		ppc_ldptr_update (code, ppc_r0, (unsigned int)sizeof (gpointer), ppc_r11);
-		ppc_stptr_update (code, ppc_r0, (unsigned int)sizeof (gpointer), ppc_r12);
+		ppc_ldptr_update (code, ppc_r0, (unsigned int)sizeof (gpointer), ppc_r12);
+		ppc_stptr_update (code, ppc_r0, (unsigned int)sizeof (gpointer), ppc_r11);
 		copy_loop_jump = code;
 		ppc_bc (code, PPC_BR_DEC_CTR_NONZERO, 0, 0);
 		ppc_patch (copy_loop_jump, copy_loop_start);
 		size -= shifted * sizeof (gpointer);
 		doffset = soffset = 0;
-		dreg = ppc_r12;
+		dreg = ppc_r11;
 	}
 #ifdef __mono_ppc64__
 	/* the hardware has multiple load/store units and the move is long
 	   enough to use more then one regiester, then use load/load/store/store
 	   to execute 2 instructions per cycle. */
-	if ((cpu_hw_caps & PPC_MULTIPLE_LS_UNITS) && (dreg != ppc_r12) && (sreg != ppc_r12)) { 
+	if ((cpu_hw_caps & PPC_MULTIPLE_LS_UNITS) && (dreg != ppc_r11) && (sreg != ppc_r11)) { 
 		while (size >= 16) {
 			ppc_ldptr (code, ppc_r0, soffset, sreg);
-			ppc_ldptr (code, ppc_r12, soffset+8, sreg);
+			ppc_ldptr (code, ppc_r11, soffset+8, sreg);
 			ppc_stptr (code, ppc_r0, doffset, dreg);
-			ppc_stptr (code, ppc_r12, doffset+8, dreg);
+			ppc_stptr (code, ppc_r11, doffset+8, dreg);
 			size -= 16;
 			soffset += 16;
 			doffset += 16; 
@@ -226,12 +226,12 @@ emit_memcpy (guint8 *code, int size, int
 		doffset += 8;
 	}
 #else
-	if ((cpu_hw_caps & PPC_MULTIPLE_LS_UNITS) && (dreg != ppc_r12) && (sreg != ppc_r12)) { 
+	if ((cpu_hw_caps & PPC_MULTIPLE_LS_UNITS) && (dreg != ppc_r11) && (sreg != ppc_r11)) { 
 		while (size >= 8) {
 			ppc_lwz (code, ppc_r0, soffset, sreg);
-			ppc_lwz (code, ppc_r12, soffset+4, sreg);
+			ppc_lwz (code, ppc_r11, soffset+4, sreg);
 			ppc_stw (code, ppc_r0, doffset, dreg);
-			ppc_stw (code, ppc_r12, doffset+4, dreg);
+			ppc_stw (code, ppc_r11, doffset+4, dreg);
 			size -= 8;
 			soffset += 8;
 			doffset += 8; 
@@ -737,7 +737,7 @@ mono_arch_get_global_int_regs (MonoCompi
 	for (i = 14; i < top; ++i) {
 		/*
 		 * Reserve r29 for holding the vtable address for virtual calls in AOT mode,
-		 * since the trampolines can clobber r11.
+		 * since the trampolines can clobber r12.
 		 */
 		if (!(cfg->compile_aot && i == 29))
 			regs = g_list_prepend (regs, GUINT_TO_POINTER (i));
@@ -2922,7 +2922,7 @@ ppc_patch_full (guchar *code, const guch
 
 			if (!is_fd) {
 				guint8 *buf = (guint8*)&seq [5];
-				ppc_mr (buf, ppc_r0, ppc_r11);
+				ppc_mr (buf, ppc_r0, ppc_r12);
 				ppc_nop (buf);
 			}
 		} else {
@@ -2932,8 +2932,8 @@ ppc_patch_full (guchar *code, const guch
 
 		/* FIXME: make this thread safe */
 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
-		/* FIXME: we're assuming we're using r11 here */
-		ppc_load_ptr_sequence (code, ppc_r11, target);
+		/* FIXME: we're assuming we're using r12 here */
+		ppc_load_ptr_sequence (code, ppc_r12, target);
 #else
 		ppc_load_ptr_sequence (code, ppc_r0, target);
 #endif
@@ -3009,8 +3009,8 @@ emit_reserve_param_area (MonoCompile *cf
 	if (ppc_is_imm16 (-size)) {
 		ppc_stptr_update (code, ppc_r0, -size, ppc_sp);
 	} else {
-		ppc_load (code, ppc_r11, -size);
-		ppc_stptr_update_indexed (code, ppc_r0, ppc_sp, ppc_r11);
+		ppc_load (code, ppc_r12, -size);
+		ppc_stptr_update_indexed (code, ppc_r0, ppc_sp, ppc_r12);
 	}
 
 	return code;
@@ -3031,8 +3031,8 @@ emit_unreserve_param_area (MonoCompile *
 	if (ppc_is_imm16 (size)) {
 		ppc_stptr_update (code, ppc_r0, size, ppc_sp);
 	} else {
-		ppc_load (code, ppc_r11, size);
-		ppc_stptr_update_indexed (code, ppc_r0, ppc_sp, ppc_r11);
+		ppc_load (code, ppc_r12, size);
+		ppc_stptr_update_indexed (code, ppc_r0, ppc_sp, ppc_r12);
 	}
 
 	return code;
@@ -3106,8 +3106,8 @@ mono_arch_output_basic_block (MonoCompil
 			 * a breakpoint is hit will step to the next IL offset.
 			 */
 			if (ins->flags & MONO_INST_SINGLE_STEP_LOC) {
-				ppc_load (code, ppc_r11, (gsize)ss_trigger_page);
-				ppc_ldptr (code, ppc_r11, 0, ppc_r11);
+				ppc_load (code, ppc_r12, (gsize)ss_trigger_page);
+				ppc_ldptr (code, ppc_r12, 0, ppc_r12);
 			}
 
 			mono_add_seq_point (cfg, bb, ins, code - cfg->native_code);
@@ -3141,8 +3141,8 @@ mono_arch_output_basic_block (MonoCompil
 				ppc_stb (code, ins->sreg1, ins->inst_offset, ins->inst_destbasereg);
 			} else {
 				if (ppc_is_imm32 (ins->inst_offset)) {
-					ppc_addis (code, ppc_r12, ins->inst_destbasereg, ppc_ha(ins->inst_offset));
-					ppc_stb (code, ins->sreg1, ins->inst_offset, ppc_r12);
+					ppc_addis (code, ppc_r11, ins->inst_destbasereg, ppc_ha(ins->inst_offset));
+					ppc_stb (code, ins->sreg1, ins->inst_offset, ppc_r11);
 				} else {
 					ppc_load (code, ppc_r0, ins->inst_offset);
 					ppc_stbx (code, ins->sreg1, ins->inst_destbasereg, ppc_r0);
@@ -3154,8 +3154,8 @@ mono_arch_output_basic_block (MonoCompil
 				ppc_sth (code, ins->sreg1, ins->inst_offset, ins->inst_destbasereg);
 			} else {
 				if (ppc_is_imm32 (ins->inst_offset)) {
-					ppc_addis (code, ppc_r12, ins->inst_destbasereg, ppc_ha(ins->inst_offset));
-					ppc_sth (code, ins->sreg1, ins->inst_offset, ppc_r12);
+					ppc_addis (code, ppc_r11, ins->inst_destbasereg, ppc_ha(ins->inst_offset));
+					ppc_sth (code, ins->sreg1, ins->inst_offset, ppc_r11);
 				} else {
 					ppc_load (code, ppc_r0, ins->inst_offset);
 					ppc_sthx (code, ins->sreg1, ins->inst_destbasereg, ppc_r0);
@@ -3167,8 +3167,8 @@ mono_arch_output_basic_block (MonoCompil
 				ppc_stptr (code, ins->sreg1, ins->inst_offset, ins->inst_destbasereg);
 			} else {
 				if (ppc_is_imm32 (ins->inst_offset)) {
-					ppc_addis (code, ppc_r12, ins->inst_destbasereg, ppc_ha(ins->inst_offset));
-					ppc_stptr (code, ins->sreg1, ins->inst_offset, ppc_r12);
+					ppc_addis (code, ppc_r11, ins->inst_destbasereg, ppc_ha(ins->inst_offset));
+					ppc_stptr (code, ins->sreg1, ins->inst_offset, ppc_r11);
 				} else {
 					ppc_load (code, ppc_r0, ins->inst_offset);
 					ppc_stptr_indexed (code, ins->sreg1, ins->inst_destbasereg, ppc_r0);
@@ -3724,7 +3724,7 @@ mono_arch_output_basic_block (MonoCompil
 			 */
 			g_assert (!cfg->method->save_lmf);
 			/*
-			 * Note: we can use ppc_r11 here because it is dead anyway:
+			 * Note: we can use ppc_r12 here because it is dead anyway:
 			 * we're leaving the method.
 			 */
 			if (1 || cfg->flags & MONO_CFG_HAS_CALLS) {
@@ -3732,26 +3732,26 @@ mono_arch_output_basic_block (MonoCompil
 				if (ppc_is_imm16 (ret_offset)) {
 					ppc_ldptr (code, ppc_r0, ret_offset, cfg->frame_reg);
 				} else {
-					ppc_load (code, ppc_r11, ret_offset);
-					ppc_ldptr_indexed (code, ppc_r0, cfg->frame_reg, ppc_r11);
+					ppc_load (code, ppc_r12, ret_offset);
+					ppc_ldptr_indexed (code, ppc_r0, cfg->frame_reg, ppc_r12);
 				}
 				ppc_mtlr (code, ppc_r0);
 			}
 
 			if (ppc_is_imm16 (cfg->stack_usage)) {
-				ppc_addi (code, ppc_r11, cfg->frame_reg, cfg->stack_usage);
+				ppc_addi (code, ppc_r12, cfg->frame_reg, cfg->stack_usage);
 			} else {
 				/* cfg->stack_usage is an int, so we can use
 				 * an addis/addi sequence here even in 64-bit.  */
-				ppc_addis (code, ppc_r11, cfg->frame_reg, ppc_ha(cfg->stack_usage));
-				ppc_addi (code, ppc_r11, ppc_r11, cfg->stack_usage);
+				ppc_addis (code, ppc_r12, cfg->frame_reg, ppc_ha(cfg->stack_usage));
+				ppc_addi (code, ppc_r12, ppc_r12, cfg->stack_usage);
 			}
 			if (!cfg->method->save_lmf) {
 				pos = 0;
 				for (i = 31; i >= 13; --i) {
 					if (cfg->used_int_regs & (1 << i)) {
 						pos += sizeof (gpointer);
-						ppc_ldptr (code, i, -pos, ppc_r11);
+						ppc_ldptr (code, i, -pos, ppc_r12);
 					}
 				}
 			} else {
@@ -3760,27 +3760,27 @@ mono_arch_output_basic_block (MonoCompil
 
 			/* Copy arguments on the stack to our argument area */
 			if (call->stack_usage) {
-				code = emit_memcpy (code, call->stack_usage, ppc_r11, PPC_STACK_PARAM_OFFSET, ppc_sp, PPC_STACK_PARAM_OFFSET);
-				/* r11 was clobbered */
+				code = emit_memcpy (code, call->stack_usage, ppc_r12, PPC_STACK_PARAM_OFFSET, ppc_sp, PPC_STACK_PARAM_OFFSET);
+				/* r12 was clobbered */
 				g_assert (cfg->frame_reg == ppc_sp);
 				if (ppc_is_imm16 (cfg->stack_usage)) {
-					ppc_addi (code, ppc_r11, cfg->frame_reg, cfg->stack_usage);
+					ppc_addi (code, ppc_r12, cfg->frame_reg, cfg->stack_usage);
 				} else {
 					/* cfg->stack_usage is an int, so we can use
 					 * an addis/addi sequence here even in 64-bit.  */
-					ppc_addis (code, ppc_r11, cfg->frame_reg, ppc_ha(cfg->stack_usage));
-					ppc_addi (code, ppc_r11, ppc_r11, cfg->stack_usage);
+					ppc_addis (code, ppc_r12, cfg->frame_reg, ppc_ha(cfg->stack_usage));
+					ppc_addi (code, ppc_r12, ppc_r12, cfg->stack_usage);
 				}
 			}
 
-			ppc_mr (code, ppc_sp, ppc_r11);
+			ppc_mr (code, ppc_sp, ppc_r12);
 			mono_add_patch_info (cfg, (guint8*) code - cfg->native_code, MONO_PATCH_INFO_METHOD_JUMP, call->method);
 			if (cfg->compile_aot) {
 				/* arch_emit_got_access () patches this */
 				ppc_load32 (code, ppc_r0, 0);
 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
-				ppc_ldptr_indexed (code, ppc_r11, ppc_r30, ppc_r0);
-				ppc_ldptr (code, ppc_r0, 0, ppc_r11);
+				ppc_ldptr_indexed (code, ppc_r12, ppc_r30, ppc_r0);
+				ppc_ldptr (code, ppc_r0, 0, ppc_r12);
 #else
 				ppc_ldptr_indexed (code, ppc_r0, ppc_r30, ppc_r0);
 #endif
@@ -3852,7 +3852,7 @@ mono_arch_output_basic_block (MonoCompil
 		case OP_VCALL2_MEMBASE:
 		case OP_VOIDCALL_MEMBASE:
 		case OP_CALL_MEMBASE:
-			if (cfg->compile_aot && ins->sreg1 == ppc_r11) {
+			if (cfg->compile_aot && ins->sreg1 == ppc_r12) {
 				/* The trampolines clobber this */
 				ppc_mr (code, ppc_r29, ins->sreg1);
 				ppc_ldptr (code, ppc_r0, ins->inst_offset, ppc_r29);
@@ -3870,9 +3870,9 @@ mono_arch_output_basic_block (MonoCompil
 			int alloca_waste = PPC_STACK_PARAM_OFFSET + cfg->param_area + 31;
 			int area_offset = alloca_waste;
 			area_offset &= ~31;
-			ppc_addi (code, ppc_r11, ins->sreg1, alloca_waste + 31);
+			ppc_addi (code, ppc_r12, ins->sreg1, alloca_waste + 31);
 			/* FIXME: should be calculated from MONO_ARCH_FRAME_ALIGNMENT */
-			ppc_clear_right_imm (code, ppc_r11, ppc_r11, 4);
+			ppc_clear_right_imm (code, ppc_r12, ppc_r12, 4);
 			/* use ctr to store the number of words to 0 if needed */
 			if (ins->flags & MONO_INST_INIT) {
 				/* we zero 4 bytes at a time:
@@ -3885,8 +3885,8 @@ mono_arch_output_basic_block (MonoCompil
 				ppc_mtctr (code, ppc_r0);
 			}
 			ppc_ldptr (code, ppc_r0, 0, ppc_sp);
-			ppc_neg (code, ppc_r11, ppc_r11);
-			ppc_stptr_update_indexed (code, ppc_r0, ppc_sp, ppc_r11);
+			ppc_neg (code, ppc_r12, ppc_r12);
+			ppc_stptr_update_indexed (code, ppc_r0, ppc_sp, ppc_r12);
 
 			/* FIXME: make this loop work in 8 byte
 			   increments on PPC64 */
@@ -3896,9 +3896,9 @@ mono_arch_output_basic_block (MonoCompil
 				 * run at least once
 				 */
 				ppc_addi (code, ins->dreg, ppc_sp, (area_offset - 8));
-				ppc_li (code, ppc_r11, 0);
+				ppc_li (code, ppc_r12, 0);
 				zero_loop_start = code;
-				ppc_stwu (code, ppc_r11, 4, ins->dreg);
+				ppc_stwu (code, ppc_r12, 4, ins->dreg);
 				zero_loop_jump = code;
 				ppc_bc (code, PPC_BR_DEC_CTR_NONZERO, 0, 0);
 				ppc_patch (zero_loop_jump, zero_loop_start);
@@ -3942,8 +3942,8 @@ mono_arch_output_basic_block (MonoCompil
 			if (ppc_is_imm16 (spvar->inst_offset)) {
 				ppc_stptr (code, ppc_r0, spvar->inst_offset, spvar->inst_basereg);
 			} else {
-				ppc_load (code, ppc_r11, spvar->inst_offset);
-				ppc_stptr_indexed (code, ppc_r0, ppc_r11, spvar->inst_basereg);
+				ppc_load (code, ppc_r12, spvar->inst_offset);
+				ppc_stptr_indexed (code, ppc_r0, ppc_r12, spvar->inst_basereg);
 			}
 			break;
 		}
@@ -3956,8 +3956,8 @@ mono_arch_output_basic_block (MonoCompil
 			if (ppc_is_imm16 (spvar->inst_offset)) {
 				ppc_ldptr (code, ppc_r0, spvar->inst_offset, spvar->inst_basereg);
 			} else {
-				ppc_load (code, ppc_r11, spvar->inst_offset);
-				ppc_ldptr_indexed (code, ppc_r0, spvar->inst_basereg, ppc_r11);
+				ppc_load (code, ppc_r12, spvar->inst_offset);
+				ppc_ldptr_indexed (code, ppc_r0, spvar->inst_basereg, ppc_r12);
 			}
 			ppc_mtlr (code, ppc_r0);
 			ppc_blr (code);
@@ -4063,11 +4063,11 @@ mono_arch_output_basic_block (MonoCompil
 
 			/* FIXME: Optimize this */
 			ppc_bl (code, 1);
-			ppc_mflr (code, ppc_r11);
+			ppc_mflr (code, ppc_r12);
 			ppc_b (code, 3);
 			*(double*)code = *(double*)ins->inst_p0;
 			code += 8;
-			ppc_lfd (code, ins->dreg, 8, ppc_r11);
+			ppc_lfd (code, ins->dreg, 8, ppc_r12);
 			break;
 		case OP_R4CONST:
 			g_assert_not_reached ();
@@ -4077,8 +4077,8 @@ mono_arch_output_basic_block (MonoCompil
 				ppc_stfd (code, ins->sreg1, ins->inst_offset, ins->inst_destbasereg);
 			} else {
 				if (ppc_is_imm32 (ins->inst_offset)) {
-					ppc_addis (code, ppc_r12, ins->inst_destbasereg, ppc_ha(ins->inst_offset));
-					ppc_stfd (code, ins->sreg1, ins->inst_offset, ppc_r12);
+					ppc_addis (code, ppc_r11, ins->inst_destbasereg, ppc_ha(ins->inst_offset));
+					ppc_stfd (code, ins->sreg1, ins->inst_offset, ppc_r11);
 				} else {
 					ppc_load (code, ppc_r0, ins->inst_offset);
 					ppc_stfdx (code, ins->sreg1, ins->inst_destbasereg, ppc_r0);
@@ -4090,8 +4090,8 @@ mono_arch_output_basic_block (MonoCompil
 				ppc_lfd (code, ins->dreg, ins->inst_offset, ins->inst_basereg);
 			} else {
 				if (ppc_is_imm32 (ins->inst_offset)) {
-					ppc_addis (code, ppc_r12, ins->inst_destbasereg, ppc_ha(ins->inst_offset));
-					ppc_lfd (code, ins->dreg, ins->inst_offset, ppc_r12);
+					ppc_addis (code, ppc_r11, ins->inst_destbasereg, ppc_ha(ins->inst_offset));
+					ppc_lfd (code, ins->dreg, ins->inst_offset, ppc_r11);
 				} else {
 					ppc_load (code, ppc_r0, ins->inst_offset);
 					ppc_lfdx (code, ins->dreg, ins->inst_destbasereg, ppc_r0);
@@ -4104,8 +4104,8 @@ mono_arch_output_basic_block (MonoCompil
 				ppc_stfs (code, ins->sreg1, ins->inst_offset, ins->inst_destbasereg);
 			} else {
 				if (ppc_is_imm32 (ins->inst_offset)) {
-					ppc_addis (code, ppc_r12, ins->inst_destbasereg, ppc_ha(ins->inst_offset));
-					ppc_stfs (code, ins->sreg1, ins->inst_offset, ppc_r12);
+					ppc_addis (code, ppc_r11, ins->inst_destbasereg, ppc_ha(ins->inst_offset));
+					ppc_stfs (code, ins->sreg1, ins->inst_offset, ppc_r11);
 				} else {
 					ppc_load (code, ppc_r0, ins->inst_offset);
 					ppc_stfsx (code, ins->sreg1, ins->inst_destbasereg, ppc_r0);
@@ -4117,8 +4117,8 @@ mono_arch_output_basic_block (MonoCompil
 				ppc_lfs (code, ins->dreg, ins->inst_offset, ins->inst_basereg);
 			} else {
 				if (ppc_is_imm32 (ins->inst_offset)) {
-					ppc_addis (code, ppc_r12, ins->inst_destbasereg, ppc_ha(ins->inst_offset));
-					ppc_lfs (code, ins->dreg, ins->inst_offset, ppc_r12);
+					ppc_addis (code, ppc_r11, ins->inst_destbasereg, ppc_ha(ins->inst_offset));
+					ppc_lfs (code, ins->dreg, ins->inst_offset, ppc_r11);
 				} else {
 					ppc_load (code, ppc_r0, ins->inst_offset);
 					ppc_lfsx (code, ins->dreg, ins->inst_destbasereg, ppc_r0);
@@ -4723,12 +4723,12 @@ mono_arch_emit_prolog (MonoCompile *cfg)
 			code = save_registers (cfg, code, alloc_size - pos, ppc_sp, method->save_lmf, cfg->used_int_regs, cfa_offset);
 		} else {
 			if (pos)
-				ppc_addi (code, ppc_r11, ppc_sp, -pos);
+				ppc_addi (code, ppc_r12, ppc_sp, -pos);
 			ppc_load (code, ppc_r0, -alloc_size);
 			ppc_str_update_indexed (code, ppc_sp, ppc_sp, ppc_r0);
 			cfa_offset = alloc_size;
 			mono_emit_unwind_op_def_cfa_offset (cfg, code, alloc_size);
-			code = save_registers (cfg, code, 0, ppc_r11, method->save_lmf, cfg->used_int_regs, cfa_offset);
+			code = save_registers (cfg, code, 0, ppc_r12, method->save_lmf, cfg->used_int_regs, cfa_offset);
 		}
 	}
 	if (cfg->frame_reg != ppc_sp) {
@@ -4774,8 +4774,8 @@ mono_arch_emit_prolog (MonoCompile *cfg)
 		if (ppc_is_imm16 (inst->inst_offset)) {
 			ppc_stptr (code, ainfo->reg, inst->inst_offset, inst->inst_basereg);
 		} else {
-			ppc_load (code, ppc_r11, inst->inst_offset);
-			ppc_stptr_indexed (code, ainfo->reg, ppc_r11, inst->inst_basereg);
+			ppc_load (code, ppc_r12, inst->inst_offset);
+			ppc_stptr_indexed (code, ainfo->reg, ppc_r12, inst->inst_basereg);
 		}
 	}
 
@@ -4792,8 +4792,8 @@ mono_arch_emit_prolog (MonoCompile *cfg)
 			else if (ainfo->regtype == RegTypeFP)
 				ppc_fmr (code, inst->dreg, ainfo->reg);
 			else if (ainfo->regtype == RegTypeBase) {
-				ppc_ldr (code, ppc_r11, 0, ppc_sp);
-				ppc_ldptr (code, inst->dreg, ainfo->offset, ppc_r11);
+				ppc_ldr (code, ppc_r12, 0, ppc_sp);
+				ppc_ldptr (code, inst->dreg, ainfo->offset, ppc_r12);
 			} else
 				g_assert_not_reached ();
 
@@ -4808,11 +4808,11 @@ mono_arch_emit_prolog (MonoCompile *cfg)
 						ppc_stb (code, ainfo->reg, inst->inst_offset, inst->inst_basereg);
 					} else {
 						if (ppc_is_imm32 (inst->inst_offset)) {
-							ppc_addis (code, ppc_r11, inst->inst_basereg, ppc_ha(inst->inst_offset));
-							ppc_stb (code, ainfo->reg, inst->inst_offset, ppc_r11);
+							ppc_addis (code, ppc_r12, inst->inst_basereg, ppc_ha(inst->inst_offset));
+							ppc_stb (code, ainfo->reg, inst->inst_offset, ppc_r12);
 						} else {
-							ppc_load (code, ppc_r11, inst->inst_offset);
-							ppc_stbx (code, ainfo->reg, inst->inst_basereg, ppc_r11);
+							ppc_load (code, ppc_r12, inst->inst_offset);
+							ppc_stbx (code, ainfo->reg, inst->inst_basereg, ppc_r12);
 						}
 					}
 					break;
@@ -4821,11 +4821,11 @@ mono_arch_emit_prolog (MonoCompile *cfg)
 						ppc_sth (code, ainfo->reg, inst->inst_offset, inst->inst_basereg);
 					} else {
 						if (ppc_is_imm32 (inst->inst_offset)) {
-							ppc_addis (code, ppc_r11, inst->inst_basereg, ppc_ha(inst->inst_offset));
-							ppc_sth (code, ainfo->reg, inst->inst_offset, ppc_r11);
+							ppc_addis (code, ppc_r12, inst->inst_basereg, ppc_ha(inst->inst_offset));
+							ppc_sth (code, ainfo->reg, inst->inst_offset, ppc_r12);
 						} else {
-							ppc_load (code, ppc_r11, inst->inst_offset);
-							ppc_sthx (code, ainfo->reg, inst->inst_basereg, ppc_r11);
+							ppc_load (code, ppc_r12, inst->inst_offset);
+							ppc_sthx (code, ainfo->reg, inst->inst_basereg, ppc_r12);
 						}
 					}
 					break;
@@ -4835,11 +4835,11 @@ mono_arch_emit_prolog (MonoCompile *cfg)
 						ppc_stw (code, ainfo->reg, inst->inst_offset, inst->inst_basereg);
 					} else {
 						if (ppc_is_imm32 (inst->inst_offset)) {
-							ppc_addis (code, ppc_r11, inst->inst_basereg, ppc_ha(inst->inst_offset));
-							ppc_stw (code, ainfo->reg, inst->inst_offset, ppc_r11);
+							ppc_addis (code, ppc_r12, inst->inst_basereg, ppc_ha(inst->inst_offset));
+							ppc_stw (code, ainfo->reg, inst->inst_offset, ppc_r12);
 						} else {
-							ppc_load (code, ppc_r11, inst->inst_offset);
-							ppc_stwx (code, ainfo->reg, inst->inst_basereg, ppc_r11);
+							ppc_load (code, ppc_r12, inst->inst_offset);
+							ppc_stwx (code, ainfo->reg, inst->inst_basereg, ppc_r12);
 						}
 					}
 					break;
@@ -4847,8 +4847,8 @@ mono_arch_emit_prolog (MonoCompile *cfg)
 					if (ppc_is_imm16 (inst->inst_offset)) {
 						ppc_str (code, ainfo->reg, inst->inst_offset, inst->inst_basereg);
 					} else {
-						ppc_load (code, ppc_r11, inst->inst_offset);
-						ppc_str_indexed (code, ainfo->reg, ppc_r11, inst->inst_basereg);
+						ppc_load (code, ppc_r12, inst->inst_offset);
+						ppc_str_indexed (code, ainfo->reg, ppc_r12, inst->inst_basereg);
 					}
 					break;
 #else
@@ -4857,10 +4857,10 @@ mono_arch_emit_prolog (MonoCompile *cfg)
 						ppc_stw (code, ainfo->reg, inst->inst_offset, inst->inst_basereg);
 						ppc_stw (code, ainfo->reg + 1, inst->inst_offset + 4, inst->inst_basereg);
 					} else {
-						ppc_addis (code, ppc_r11, inst->inst_basereg, ppc_ha(inst->inst_offset));
-						ppc_addi (code, ppc_r11, ppc_r11, inst->inst_offset);
-						ppc_stw (code, ainfo->reg, 0, ppc_r11);
-						ppc_stw (code, ainfo->reg + 1, 4, ppc_r11);
+						ppc_addis (code, ppc_r12, inst->inst_basereg, ppc_ha(inst->inst_offset));
+						ppc_addi (code, ppc_r12, ppc_r12, inst->inst_offset);
+						ppc_stw (code, ainfo->reg, 0, ppc_r12);
+						ppc_stw (code, ainfo->reg + 1, 4, ppc_r12);
 					}
 					break;
 #endif
@@ -4869,31 +4869,31 @@ mono_arch_emit_prolog (MonoCompile *cfg)
 						ppc_stptr (code, ainfo->reg, inst->inst_offset, inst->inst_basereg);
 					} else {
 						if (ppc_is_imm32 (inst->inst_offset)) {
-							ppc_addis (code, ppc_r11, inst->inst_basereg, ppc_ha(inst->inst_offset));
-							ppc_stptr (code, ainfo->reg, inst->inst_offset, ppc_r11);
+							ppc_addis (code, ppc_r12, inst->inst_basereg, ppc_ha(inst->inst_offset));
+							ppc_stptr (code, ainfo->reg, inst->inst_offset, ppc_r12);
 						} else {
-							ppc_load (code, ppc_r11, inst->inst_offset);
-							ppc_stptr_indexed (code, ainfo->reg, inst->inst_basereg, ppc_r11);
+							ppc_load (code, ppc_r12, inst->inst_offset);
+							ppc_stptr_indexed (code, ainfo->reg, inst->inst_basereg, ppc_r12);
 						}
 					}
 					break;
 				}
 			} else if (ainfo->regtype == RegTypeBase) {
 				g_assert (ppc_is_imm16 (ainfo->offset));
-				/* load the previous stack pointer in r11 */
-				ppc_ldr (code, ppc_r11, 0, ppc_sp);
-				ppc_ldptr (code, ppc_r0, ainfo->offset, ppc_r11);
+				/* load the previous stack pointer in r12 */
+				ppc_ldr (code, ppc_r12, 0, ppc_sp);
+				ppc_ldptr (code, ppc_r0, ainfo->offset, ppc_r12);
 				switch (ainfo->size) {
 				case 1:
 					if (ppc_is_imm16 (inst->inst_offset)) {
 						ppc_stb (code, ppc_r0, inst->inst_offset, inst->inst_basereg);
 					} else {
 						if (ppc_is_imm32 (inst->inst_offset)) {
-							ppc_addis (code, ppc_r11, inst->inst_basereg, ppc_ha(inst->inst_offset));
-							ppc_stb (code, ppc_r0, inst->inst_offset, ppc_r11);
+							ppc_addis (code, ppc_r12, inst->inst_basereg, ppc_ha(inst->inst_offset));
+							ppc_stb (code, ppc_r0, inst->inst_offset, ppc_r12);
 						} else {
-							ppc_load (code, ppc_r11, inst->inst_offset);
-							ppc_stbx (code, ppc_r0, inst->inst_basereg, ppc_r11);
+							ppc_load (code, ppc_r12, inst->inst_offset);
+							ppc_stbx (code, ppc_r0, inst->inst_basereg, ppc_r12);
 						}
 					}
 					break;
@@ -4902,11 +4902,11 @@ mono_arch_emit_prolog (MonoCompile *cfg)
 						ppc_sth (code, ppc_r0, inst->inst_offset, inst->inst_basereg);
 					} else {
 						if (ppc_is_imm32 (inst->inst_offset)) {
-							ppc_addis (code, ppc_r11, inst->inst_basereg, ppc_ha(inst->inst_offset));
-							ppc_sth (code, ppc_r0, inst->inst_offset, ppc_r11);
+							ppc_addis (code, ppc_r12, inst->inst_basereg, ppc_ha(inst->inst_offset));
+							ppc_sth (code, ppc_r0, inst->inst_offset, ppc_r12);
 						} else {
-							ppc_load (code, ppc_r11, inst->inst_offset);
-							ppc_sthx (code, ppc_r0, inst->inst_basereg, ppc_r11);
+							ppc_load (code, ppc_r12, inst->inst_offset);
+							ppc_sthx (code, ppc_r0, inst->inst_basereg, ppc_r12);
 						}
 					}
 					break;
@@ -4916,11 +4916,11 @@ mono_arch_emit_prolog (MonoCompile *cfg)
 						ppc_stw (code, ppc_r0, inst->inst_offset, inst->inst_basereg);
 					} else {
 						if (ppc_is_imm32 (inst->inst_offset)) {
-							ppc_addis (code, ppc_r11, inst->inst_basereg, ppc_ha(inst->inst_offset));
-							ppc_stw (code, ppc_r0, inst->inst_offset, ppc_r11);
+							ppc_addis (code, ppc_r12, inst->inst_basereg, ppc_ha(inst->inst_offset));
+							ppc_stw (code, ppc_r0, inst->inst_offset, ppc_r12);
 						} else {
-							ppc_load (code, ppc_r11, inst->inst_offset);
-							ppc_stwx (code, ppc_r0, inst->inst_basereg, ppc_r11);
+							ppc_load (code, ppc_r12, inst->inst_offset);
+							ppc_stwx (code, ppc_r0, inst->inst_basereg, ppc_r12);
 						}
 					}
 					break;
@@ -4928,8 +4928,8 @@ mono_arch_emit_prolog (MonoCompile *cfg)
 					if (ppc_is_imm16 (inst->inst_offset)) {
 						ppc_str (code, ppc_r0, inst->inst_offset, inst->inst_basereg);
 					} else {
-						ppc_load (code, ppc_r11, inst->inst_offset);
-						ppc_str_indexed (code, ppc_r0, ppc_r11, inst->inst_basereg);
+						ppc_load (code, ppc_r12, inst->inst_offset);
+						ppc_str_indexed (code, ppc_r0, ppc_r12, inst->inst_basereg);
 					}
 					break;
 #else
@@ -4937,15 +4937,15 @@ mono_arch_emit_prolog (MonoCompile *cfg)
 					g_assert (ppc_is_imm16 (ainfo->offset + 4));
 					if (ppc_is_imm16 (inst->inst_offset + 4)) {
 						ppc_stw (code, ppc_r0, inst->inst_offset, inst->inst_basereg);
-						ppc_lwz (code, ppc_r0, ainfo->offset + 4, ppc_r11);
+						ppc_lwz (code, ppc_r0, ainfo->offset + 4, ppc_r12);
 						ppc_stw (code, ppc_r0, inst->inst_offset + 4, inst->inst_basereg);
 					} else {
-						/* use r12 to load the 2nd half of the long before we clobber r11.  */
-						ppc_lwz (code, ppc_r12, ainfo->offset + 4, ppc_r11);
-						ppc_addis (code, ppc_r11, inst->inst_basereg, ppc_ha(inst->inst_offset));
-						ppc_addi (code, ppc_r11, ppc_r11, inst->inst_offset);
-						ppc_stw (code, ppc_r0, 0, ppc_r11);
-						ppc_stw (code, ppc_r12, 4, ppc_r11);
+						/* use r11 to load the 2nd half of the long before we clobber r12.  */
+						ppc_lwz (code, ppc_r11, ainfo->offset + 4, ppc_r12);
+						ppc_addis (code, ppc_r12, inst->inst_basereg, ppc_ha(inst->inst_offset));
+						ppc_addi (code, ppc_r12, ppc_r12, inst->inst_offset);
+						ppc_stw (code, ppc_r0, 0, ppc_r12);
+						ppc_stw (code, ppc_r11, 4, ppc_r12);
 					}
 					break;
 #endif
@@ -4954,11 +4954,11 @@ mono_arch_emit_prolog (MonoCompile *cfg)
 						ppc_stptr (code, ppc_r0, inst->inst_offset, inst->inst_basereg);
 					} else {
 						if (ppc_is_imm32 (inst->inst_offset)) {
-							ppc_addis (code, ppc_r11, inst->inst_basereg, ppc_ha(inst->inst_offset));
-							ppc_stptr (code, ppc_r0, inst->inst_offset, ppc_r11);
+							ppc_addis (code, ppc_r12, inst->inst_basereg, ppc_ha(inst->inst_offset));
+							ppc_stptr (code, ppc_r0, inst->inst_offset, ppc_r12);
 						} else {
-							ppc_load (code, ppc_r11, inst->inst_offset);
-							ppc_stptr_indexed (code, ppc_r0, inst->inst_basereg, ppc_r11);
+							ppc_load (code, ppc_r12, inst->inst_offset);
+							ppc_stptr_indexed (code, ppc_r0, inst->inst_basereg, ppc_r12);
 						}
 					}
 					break;
@@ -5017,39 +5017,39 @@ mono_arch_emit_prolog (MonoCompile *cfg)
 					/* FIXME: we need to do the shifting here, too */
 					if (ainfo->bytes)
 						NOT_IMPLEMENTED;
-					/* load the previous stack pointer in r11 (r0 gets overwritten by the memcpy) */
-					ppc_ldr (code, ppc_r11, 0, ppc_sp);
+					/* load the previous stack pointer in r12 (r0 gets overwritten by the memcpy) */
+					ppc_ldr (code, ppc_r12, 0, ppc_sp);
 					if ((size & MONO_PPC_32_64_CASE (3, 7)) != 0) {
 						code = emit_memcpy (code, size - soffset,
 							inst->inst_basereg, doffset,
-							ppc_r11, ainfo->offset + soffset);
+							ppc_r12, ainfo->offset + soffset);
 					} else {
 						code = emit_memcpy (code, ainfo->vtsize * sizeof (gpointer),
 							inst->inst_basereg, doffset,
-							ppc_r11, ainfo->offset + soffset);
+							ppc_r12, ainfo->offset + soffset);
 					}
 				}
 			} else if (ainfo->regtype == RegTypeStructByAddr) {
 				/* if it was originally a RegTypeBase */
 				if (ainfo->offset) {
-					/* load the previous stack pointer in r11 */
-					ppc_ldr (code, ppc_r11, 0, ppc_sp);
-					ppc_ldptr (code, ppc_r11, ainfo->offset, ppc_r11);
+					/* load the previous stack pointer in r12 */
+					ppc_ldr (code, ppc_r12, 0, ppc_sp);
+					ppc_ldptr (code, ppc_r12, ainfo->offset, ppc_r12);
 				} else {
-					ppc_mr (code, ppc_r11, ainfo->reg);
+					ppc_mr (code, ppc_r12, ainfo->reg);
 				}
 
 				if (cfg->tailcall_valuetype_addrs) {
 					MonoInst *addr = cfg->tailcall_valuetype_addrs [tailcall_struct_index];
 
 					g_assert (ppc_is_imm16 (addr->inst_offset));
-					ppc_stptr (code, ppc_r11, addr->inst_offset, addr->inst_basereg);
+					ppc_stptr (code, ppc_r12, addr->inst_offset, addr->inst_basereg);
 
 					tailcall_struct_index++;
 				}
 
 				g_assert (ppc_is_imm16 (inst->inst_offset));
-				code = emit_memcpy (code, ainfo->vtsize, inst->inst_basereg, inst->inst_offset, ppc_r11, 0);
+				code = emit_memcpy (code, ainfo->vtsize, inst->inst_basereg, inst->inst_offset, ppc_r12, 0);
 				/*g_print ("copy in %s: %d bytes from %d to offset: %d\n", method->name, ainfo->vtsize, ainfo->reg, inst->inst_offset);*/
 			} else
 				g_assert_not_reached ();
@@ -5081,25 +5081,25 @@ mono_arch_emit_prolog (MonoCompile *cfg)
 		/* lmf_offset is the offset from the previous stack pointer,
 		 * alloc_size is the total stack space allocated, so the offset
 		 * of MonoLMF from the current stack ptr is alloc_size - lmf_offset.
-		 * The pointer to the struct is put in ppc_r11 (new_lmf).
+		 * The pointer to the struct is put in ppc_r12 (new_lmf).
 		 * The callee-saved registers are already in the MonoLMF structure
 		 */
-		ppc_addi (code, ppc_r11, ppc_sp, alloc_size - lmf_offset);
+		ppc_addi (code, ppc_r12, ppc_sp, alloc_size - lmf_offset);
 		/* ppc_r3 is the result from mono_get_lmf_addr () */
-		ppc_stptr (code, ppc_r3, G_STRUCT_OFFSET(MonoLMF, lmf_addr), ppc_r11);
+		ppc_stptr (code, ppc_r3, G_STRUCT_OFFSET(MonoLMF, lmf_addr), ppc_r12);
 		/* new_lmf->previous_lmf = *lmf_addr */
 		ppc_ldptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r3);
-		ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r11);
-		/* *(lmf_addr) = r11 */
-		ppc_stptr (code, ppc_r11, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r3);
+		ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r12);
+		/* *(lmf_addr) = r12 */
+		ppc_stptr (code, ppc_r12, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r3);
 		/* save method info */
 		if (cfg->compile_aot)
 			// FIXME:
 			ppc_load (code, ppc_r0, 0);
 		else
 			ppc_load_ptr (code, ppc_r0, method);
-		ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, method), ppc_r11);
-		ppc_stptr (code, ppc_sp, G_STRUCT_OFFSET(MonoLMF, ebp), ppc_r11);
+		ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, method), ppc_r12);
+		ppc_stptr (code, ppc_sp, G_STRUCT_OFFSET(MonoLMF, ebp), ppc_r12);
 		/* save the current IP */
 		if (cfg->compile_aot) {
 			ppc_bl (code, 1);
@@ -5112,7 +5112,7 @@ mono_arch_emit_prolog (MonoCompile *cfg)
 			ppc_load_sequence (code, ppc_r0, (gulong)0x01010101L);
 #endif
 		}
-		ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, eip), ppc_r11);
+		ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, eip), ppc_r12);
 	}
 
 	if (tracing)
@@ -5164,21 +5164,21 @@ mono_arch_emit_epilog (MonoCompile *cfg)
 		lmf_offset = pos;
 		/* save the frame reg in r8 */
 		ppc_mr (code, ppc_r8, cfg->frame_reg);
-		ppc_addi (code, ppc_r11, cfg->frame_reg, cfg->stack_usage - lmf_offset);
+		ppc_addi (code, ppc_r12, cfg->frame_reg, cfg->stack_usage - lmf_offset);
 		/* r5 = previous_lmf */
-		ppc_ldptr (code, ppc_r5, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r11);
+		ppc_ldptr (code, ppc_r5, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r12);
 		/* r6 = lmf_addr */
-		ppc_ldptr (code, ppc_r6, G_STRUCT_OFFSET(MonoLMF, lmf_addr), ppc_r11);
+		ppc_ldptr (code, ppc_r6, G_STRUCT_OFFSET(MonoLMF, lmf_addr), ppc_r12);
 		/* *(lmf_addr) = previous_lmf */
 		ppc_stptr (code, ppc_r5, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r6);
 		/* FIXME: speedup: there is no actual need to restore the registers if
 		 * we didn't actually change them (idea from Zoltan).
 		 */
 		/* restore iregs */
-		ppc_ldr_multiple (code, ppc_r13, G_STRUCT_OFFSET(MonoLMF, iregs), ppc_r11);
+		ppc_ldr_multiple (code, ppc_r13, G_STRUCT_OFFSET(MonoLMF, iregs), ppc_r12);
 		/* restore fregs */
 		/*for (i = 14; i < 32; i++) {
-			ppc_lfd (code, i, G_STRUCT_OFFSET(MonoLMF, fregs) + ((i-14) * sizeof (gdouble)), ppc_r11);
+			ppc_lfd (code, i, G_STRUCT_OFFSET(MonoLMF, fregs) + ((i-14) * sizeof (gdouble)), ppc_r12);
 		}*/
 		g_assert (ppc_is_imm16 (cfg->stack_usage + PPC_RET_ADDR_OFFSET));
 		/* use the saved copy of the frame reg in r8 */
@@ -5193,8 +5193,8 @@ mono_arch_emit_epilog (MonoCompile *cfg)
 			if (ppc_is_imm16 (return_offset)) {
 				ppc_ldr (code, ppc_r0, return_offset, cfg->frame_reg);
 			} else {
-				ppc_load (code, ppc_r11, return_offset);
-				ppc_ldr_indexed (code, ppc_r0, cfg->frame_reg, ppc_r11);
+				ppc_load (code, ppc_r12, return_offset);
+				ppc_ldr_indexed (code, ppc_r0, cfg->frame_reg, ppc_r12);
 			}
 			ppc_mtlr (code, ppc_r0);
 		}
@@ -5205,7 +5205,7 @@ mono_arch_emit_epilog (MonoCompile *cfg)
 					offset -= sizeof (mgreg_t);
 			}
 			if (cfg->frame_reg != ppc_sp)
-				ppc_mr (code, ppc_r11, cfg->frame_reg);
+				ppc_mr (code, ppc_r12, cfg->frame_reg);
 			/* note r31 (possibly the frame register) is restored last */
 			for (i = 13; i <= 31; i++) {
 				if (cfg->used_int_regs & (1 << i)) {
@@ -5214,22 +5214,22 @@ mono_arch_emit_epilog (MonoCompile *cfg)
 				}
 			}
 			if (cfg->frame_reg != ppc_sp)
-				ppc_addi (code, ppc_sp, ppc_r11, cfg->stack_usage);
+				ppc_addi (code, ppc_sp, ppc_r12, cfg->stack_usage);
 			else
 				ppc_addi (code, ppc_sp, ppc_sp, cfg->stack_usage);
 		} else {
-			ppc_load32 (code, ppc_r11, cfg->stack_usage);
+			ppc_load32 (code, ppc_r12, cfg->stack_usage);
 			if (cfg->used_int_regs) {
-				ppc_add (code, ppc_r11, cfg->frame_reg, ppc_r11);
+				ppc_add (code, ppc_r12, cfg->frame_reg, ppc_r12);
 				for (i = 31; i >= 13; --i) {
 					if (cfg->used_int_regs & (1 << i)) {
 						pos += sizeof (mgreg_t);
-						ppc_ldr (code, i, -pos, ppc_r11);
+						ppc_ldr (code, i, -pos, ppc_r12);
 					}
 				}
-				ppc_mr (code, ppc_sp, ppc_r11);
+				ppc_mr (code, ppc_sp, ppc_r12);
 			} else {
-				ppc_add (code, ppc_sp, cfg->frame_reg, ppc_r11);
+				ppc_add (code, ppc_sp, cfg->frame_reg, ppc_r12);
 			}
 		}
 
@@ -5618,15 +5618,15 @@ mono_arch_build_imt_thunk (MonoVTable *v
 	start = code;
 
 	/*
-	 * We need to save and restore r11 because it might be
+	 * We need to save and restore r12 because it might be
 	 * used by the caller as the vtable register, so
 	 * clobbering it will trip up the magic trampoline.
 	 *
-	 * FIXME: Get rid of this by making sure that r11 is
+	 * FIXME: Get rid of this by making sure that r12 is
 	 * not used as the vtable register in interface calls.
 	 */
-	ppc_stptr (code, ppc_r11, PPC_RET_ADDR_OFFSET, ppc_sp);
-	ppc_load (code, ppc_r11, (gsize)(& (vtable->vtable [0])));
+	ppc_stptr (code, ppc_r12, PPC_RET_ADDR_OFFSET, ppc_sp);
+	ppc_load (code, ppc_r12, (gsize)(& (vtable->vtable [0])));
 
 	for (i = 0; i < count; ++i) {
 		MonoIMTCheckItem *item = imt_entries [i];
@@ -5642,8 +5642,8 @@ mono_arch_build_imt_thunk (MonoVTable *v
 				if (item->has_target_code) {
 					ppc_load_ptr (code, ppc_r0, item->value.target_code);
 				} else {
-					ppc_ldptr (code, ppc_r0, (sizeof (gpointer) * item->value.vtable_slot), ppc_r11);
-					ppc_ldptr (code, ppc_r11, PPC_RET_ADDR_OFFSET, ppc_sp);
+					ppc_ldptr (code, ppc_r0, (sizeof (gpointer) * item->value.vtable_slot), ppc_r12);
+					ppc_ldptr (code, ppc_r12, PPC_RET_ADDR_OFFSET, ppc_sp);
 				}
 				ppc_mtctr (code, ppc_r0);
 				ppc_bcctr (code, PPC_BR_ALWAYS, 0);
@@ -5675,8 +5675,8 @@ mono_arch_build_imt_thunk (MonoVTable *v
 					item->jmp_code = code;
 					ppc_bc (code, PPC_BR_FALSE, PPC_BR_EQ, 0);
 #endif
-					ppc_ldptr (code, ppc_r0, (sizeof (gpointer) * item->value.vtable_slot), ppc_r11);
-					ppc_ldptr (code, ppc_r11, PPC_RET_ADDR_OFFSET, ppc_sp);
+					ppc_ldptr (code, ppc_r0, (sizeof (gpointer) * item->value.vtable_slot), ppc_r12);
+					ppc_ldptr (code, ppc_r12, PPC_RET_ADDR_OFFSET, ppc_sp);
 					ppc_mtctr (code, ppc_r0);
 					ppc_bcctr (code, PPC_BR_ALWAYS, 0);
 #if ENABLE_WRONG_METHOD_CHECK
@@ -5802,17 +5802,17 @@ mono_arch_emit_load_got_addr (guint8 *st
  *   Emit code to load the contents of the GOT slot identified by TRAMP_TYPE and
  * TARGET from the mscorlib GOT in full-aot code.
  * On PPC, the GOT address is assumed to be in r30, and the result is placed into 
- * r11.
+ * r12.
  */
 guint8*
 mono_arch_emit_load_aotconst (guint8 *start, guint8 *code, MonoJumpInfo **ji, int tramp_type, gconstpointer target)
 {
 	/* Load the mscorlib got address */
-	ppc_ldptr (code, ppc_r11, sizeof (gpointer), ppc_r30);
+	ppc_ldptr (code, ppc_r12, sizeof (gpointer), ppc_r30);
 	*ji = mono_patch_info_list_prepend (*ji, code - start, tramp_type, target);
 	/* arch_emit_got_access () patches this */
 	ppc_load32 (code, ppc_r0, 0);
-	ppc_ldptr_indexed (code, ppc_r11, ppc_r11, ppc_r0);
+	ppc_ldptr_indexed (code, ppc_r12, ppc_r12, ppc_r0);
 
 	return code;
 }
@@ -5835,8 +5835,8 @@ mono_arch_set_breakpoint (MonoJitInfo *j
 	guint8 *code = ip;
 	guint8 *orig_code = code;
 
-	ppc_load_sequence (code, ppc_r11, (gsize)bp_trigger_page);
-	ppc_ldptr (code, ppc_r11, 0, ppc_r11);
+	ppc_load_sequence (code, ppc_r12, (gsize)bp_trigger_page);
+	ppc_ldptr (code, ppc_r12, 0, ppc_r12);
 
 	g_assert (code - orig_code == BREAKPOINT_SIZE);
 
Index: mono-3.4.0/mono/mini/mini-ppc.h
===================================================================
--- mono-3.4.0.orig/mono/mini/mini-ppc.h
+++ mono-3.4.0/mono/mini/mini-ppc.h
@@ -105,7 +105,7 @@ typedef struct MonoCompileArch {
 #define MONO_ARCH_GC_MAPS_SUPPORTED 1
 
 /* Parameters used by the register allocator */
-#define MONO_ARCH_CALLEE_REGS ((0xff << ppc_r3) | (1 << ppc_r11) | (1 << ppc_r12))
+#define MONO_ARCH_CALLEE_REGS ((0xff << ppc_r3) | (1 << ppc_r12) | (1 << ppc_r11))
 #define MONO_ARCH_CALLEE_SAVED_REGS (0xfffff << ppc_r13) /* ppc_13 - ppc_31 */
 
 #if defined(__APPLE__) || defined(__mono_ppc64__)
@@ -179,9 +179,9 @@ typedef struct MonoCompileArch {
 
 #define MONO_ARCH_HAVE_CREATE_DELEGATE_TRAMPOLINE
 #define MONO_ARCH_HAVE_IMT 1
-#define MONO_ARCH_IMT_REG ppc_r12
+#define MONO_ARCH_IMT_REG ppc_r11
 
-#define MONO_ARCH_VTABLE_REG	ppc_r12
+#define MONO_ARCH_VTABLE_REG	ppc_r11
 #define MONO_ARCH_RGCTX_REG	MONO_ARCH_IMT_REG
 
 #define MONO_ARCH_NO_IOV_CHECK 1
Index: mono-3.4.0/mono/mini/tramp-ppc.c
===================================================================
--- mono-3.4.0.orig/mono/mini/tramp-ppc.c
+++ mono-3.4.0/mono/mini/tramp-ppc.c
@@ -300,10 +300,10 @@ mono_arch_create_generic_trampoline (Mon
 	if (aot) {
 		code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_get_lmf_addr");
 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
-		ppc_ldptr (code, ppc_r2, sizeof (gpointer), ppc_r11);
-		ppc_ldptr (code, ppc_r11, 0, ppc_r11);
+		ppc_ldptr (code, ppc_r2, sizeof (gpointer), ppc_r12);
+		ppc_ldptr (code, ppc_r12, 0, ppc_r12);
 #endif
-		ppc_mtlr (code, ppc_r11);
+		ppc_mtlr (code, ppc_r12);
 		ppc_blrl (code);
 	}  else {
 		ppc_load_func (code, ppc_r0, mono_get_lmf_addr);
@@ -311,33 +311,33 @@ mono_arch_create_generic_trampoline (Mon
 		ppc_blrl (code);
 	}
 	/* we build the MonoLMF structure on the stack - see mini-ppc.h
-	 * The pointer to the struct is put in ppc_r11.
+	 * The pointer to the struct is put in ppc_r12.
 	 */
-	ppc_addi (code, ppc_r11, ppc_sp, STACK - sizeof (MonoLMF));
-	ppc_stptr (code, ppc_r3, G_STRUCT_OFFSET(MonoLMF, lmf_addr), ppc_r11);
+	ppc_addi (code, ppc_r12, ppc_sp, STACK - sizeof (MonoLMF));
+	ppc_stptr (code, ppc_r3, G_STRUCT_OFFSET(MonoLMF, lmf_addr), ppc_r12);
 	/* new_lmf->previous_lmf = *lmf_addr */
 	ppc_ldptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r3);
-	ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r11);
-	/* *(lmf_addr) = r11 */
-	ppc_stptr (code, ppc_r11, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r3);
+	ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r12);
+	/* *(lmf_addr) = r12 */
+	ppc_stptr (code, ppc_r12, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r3);
 	/* save method info (it's stored on the stack, so get it first). */
 	if ((tramp_type == MONO_TRAMPOLINE_JIT) || (tramp_type == MONO_TRAMPOLINE_JUMP)) {
 		ppc_ldr (code, ppc_r0, GREGS_OFFSET, ppc_r1);
-		ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, method), ppc_r11);
+		ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, method), ppc_r12);
 	} else {
 		ppc_load (code, ppc_r0, 0);
-		ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, method), ppc_r11);
+		ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, method), ppc_r12);
 	}
 	/* store the frame pointer of the calling method */
 	ppc_addi (code, ppc_r0, ppc_sp, STACK);
-	ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, ebp), ppc_r11);
+	ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, ebp), ppc_r12);
 	/* save the IP (caller ip) */
 	if (tramp_type == MONO_TRAMPOLINE_JUMP) {
 		ppc_li (code, ppc_r0, 0);
 	} else {
 		ppc_ldr (code, ppc_r0, STACK + PPC_RET_ADDR_OFFSET, ppc_r1);
 	}
-	ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, eip), ppc_r11);
+	ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, eip), ppc_r12);
 
 	/*
 	 * Now we're ready to call trampoline (mgreg_t *regs, guint8 *code, gpointer value, guint8 *tramp)
@@ -361,10 +361,10 @@ mono_arch_create_generic_trampoline (Mon
 	if (aot) {
 		code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("trampoline_func_%d", tramp_type));
 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
-		ppc_ldptr (code, ppc_r2, sizeof (gpointer), ppc_r11);
-		ppc_ldptr (code, ppc_r11, 0, ppc_r11);
+		ppc_ldptr (code, ppc_r2, sizeof (gpointer), ppc_r12);
+		ppc_ldptr (code, ppc_r12, 0, ppc_r12);
 #endif
-		ppc_mtlr (code, ppc_r11);
+		ppc_mtlr (code, ppc_r12);
 		ppc_blrl (code);
 	} else {
 		tramp_handler = mono_get_trampoline_func (tramp_type);
@@ -389,20 +389,20 @@ mono_arch_create_generic_trampoline (Mon
 	 * Now we restore the MonoLMF (see emit_epilogue in mini-ppc.c)
 	 * and the rest of the registers, so the method called will see
 	 * the same state as before we executed.
-	 * The pointer to MonoLMF is in ppc_r11.
+	 * The pointer to MonoLMF is in ppc_r12.
 	 */
-	ppc_addi (code, ppc_r11, ppc_r1, STACK - sizeof (MonoLMF));
+	ppc_addi (code, ppc_r12, ppc_r1, STACK - sizeof (MonoLMF));
 	/* r5 = previous_lmf */
-	ppc_ldptr (code, ppc_r5, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r11);
+	ppc_ldptr (code, ppc_r5, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r12);
 	/* r6 = lmf_addr */
-	ppc_ldptr (code, ppc_r6, G_STRUCT_OFFSET(MonoLMF, lmf_addr), ppc_r11);
+	ppc_ldptr (code, ppc_r6, G_STRUCT_OFFSET(MonoLMF, lmf_addr), ppc_r12);
 	/* *(lmf_addr) = previous_lmf */
 	ppc_stptr (code, ppc_r5, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r6);
 	/* restore iregs */
-	ppc_ldr_multiple (code, ppc_r13, G_STRUCT_OFFSET(MonoLMF, iregs), ppc_r11);
+	ppc_ldr_multiple (code, ppc_r13, G_STRUCT_OFFSET(MonoLMF, iregs), ppc_r12);
 	/* restore fregs */
 	for (i = 14; i < 32; i++)
-		ppc_lfd (code, i, G_STRUCT_OFFSET(MonoLMF, fregs) + ((i-14) * sizeof (gdouble)), ppc_r11);
+		ppc_lfd (code, i, G_STRUCT_OFFSET(MonoLMF, fregs) + ((i-14) * sizeof (gdouble)), ppc_r12);
 
 	/* restore the volatile registers, we skip r1, of course */
 	offset = STACK - sizeof (MonoLMF) - (14 * sizeof (double));
@@ -424,8 +424,8 @@ mono_arch_create_generic_trampoline (Mon
 	 */
 	/* Restore stack pointer and LR and jump to the code */
 	ppc_ldr  (code, ppc_r1,  0, ppc_r1);
-	ppc_ldr  (code, ppc_r11, PPC_RET_ADDR_OFFSET, ppc_r1);
-	ppc_mtlr (code, ppc_r11);
+	ppc_ldr  (code, ppc_r12, PPC_RET_ADDR_OFFSET, ppc_r1);
+	ppc_mtlr (code, ppc_r12);
 	if (MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type))
 		ppc_blr (code);
 	else
@@ -596,9 +596,9 @@ mono_arch_create_rgctx_lazy_fetch_trampo
 		code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("specific_trampoline_lazy_fetch_%u", slot));
 		/* Branch to the trampoline */
 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
-		ppc_ldptr (code, ppc_r11, 0, ppc_r11);
+		ppc_ldptr (code, ppc_r12, 0, ppc_r12);
 #endif
-		ppc_mtctr (code, ppc_r11);
+		ppc_mtctr (code, ppc_r12);
 		ppc_bcctr (code, PPC_BR_ALWAYS, 0);
 	} else {
 		tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot),
@@ -658,9 +658,9 @@ mono_arch_create_generic_class_init_tram
 		code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "specific_trampoline_generic_class_init");
 		/* Branch to the trampoline */
 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
-		ppc_ldptr (code, ppc_r11, 0, ppc_r11);
+		ppc_ldptr (code, ppc_r12, 0, ppc_r12);
 #endif
-		ppc_mtctr (code, ppc_r11);
+		ppc_mtctr (code, ppc_r12);
 		ppc_bcctr (code, PPC_BR_ALWAYS, 0);
 	} else {
 		tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_GENERIC_CLASS_INIT,