* Authors:
* Paolo Molaro (lupus@ximian.com)
*
- * (C) 2001 Ximian, Inc.
+ * (C) 2001-2003 Ximian, Inc.
+ * Copyright 2003-2011 Novell Inc
+ * Copyright 2011 Xamarin Inc
*/
#include <config.h>
#include "mini.h"
#include "mini-arm.h"
+#define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
+
static guint8* nullified_class_init_trampoline;
void
/* Stack size for trampoline function
*/
-#define STACK (sizeof (MonoLMF))
+#define STACK ALIGN_TO (sizeof (MonoLMF), 8)
/* Method-specific trampoline code fragment size */
#define METHOD_TRAMPOLINE_SIZE 64
guint8 *buf, *code = NULL;
guint8 *load_get_lmf_addr, *load_trampoline;
gpointer *constants;
- int cfa_offset;
+ int cfa_offset, lmf_offset, regsave_size, lr_offset;
GSList *unwind_ops = NULL;
MonoJumpInfo *ji = NULL;
int buf_len;
* regs on the stack (all but PC and SP). The original LR value has been
* saved as sp + LR_OFFSET by the push in the specific trampoline
*/
-#define LR_OFFSET (sizeof (mgreg_t) * 13)
+
+ /* The offset of lmf inside the stack frame */
+ lmf_offset = STACK - sizeof (MonoLMF);
+ /* The size of the area already allocated by the push in the specific trampoline */
+ regsave_size = 14 * sizeof (mgreg_t);
+ /* The offset where lr was saved inside the regsave area */
+ lr_offset = 13 * sizeof (mgreg_t);
// FIXME: Finish the unwind info, the current info allows us to unwind
// when the trampoline is not in the epilog
// PC saved at sp+LR_OFFSET
mono_add_unwind_op_offset (unwind_ops, code, buf, ARMREG_LR, -4);
- ARM_MOV_REG_REG (code, ARMREG_V1, ARMREG_SP);
if (aot && tramp_type != MONO_TRAMPOLINE_GENERIC_CLASS_INIT) {
/*
* The trampoline contains a pc-relative offset to the got slot
else
ARM_MOV_REG_REG (code, ARMREG_V2, MONO_ARCH_VTABLE_REG);
}
- ARM_LDR_IMM (code, ARMREG_V3, ARMREG_SP, LR_OFFSET);
+ ARM_LDR_IMM (code, ARMREG_V3, ARMREG_SP, lr_offset);
/* ok, now we can continue with the MonoLMF setup, mostly untouched
* from emit_prolog in mini-arm.c
* The pointer to the struct is put in r1.
* the iregs array is already allocated on the stack by push.
*/
- ARM_SUB_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, sizeof (MonoLMF) - sizeof (mgreg_t) * 14);
- cfa_offset += sizeof (MonoLMF) - sizeof (mgreg_t) * 14;
+ ARM_SUB_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, STACK - regsave_size);
+ cfa_offset += STACK - regsave_size;
mono_add_unwind_op_def_cfa_offset (unwind_ops, code, buf, cfa_offset);
- ARM_ADD_REG_IMM8 (code, ARMREG_R1, ARMREG_SP, STACK - sizeof (MonoLMF));
+ /* V1 == lmf */
+ ARM_ADD_REG_IMM8 (code, ARMREG_V1, ARMREG_SP, STACK - sizeof (MonoLMF));
+
+ /*
+ * The stack now looks like:
+ * <saved regs>
+ * v1 -> <rest of LMF>
+ * sp -> <alignment>
+ */
+
/* r0 is the result from mono_get_lmf_addr () */
- ARM_STR_IMM (code, ARMREG_R0, ARMREG_R1, G_STRUCT_OFFSET (MonoLMF, lmf_addr));
+ ARM_STR_IMM (code, ARMREG_R0, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, lmf_addr));
/* new_lmf->previous_lmf = *lmf_addr */
ARM_LDR_IMM (code, ARMREG_R2, ARMREG_R0, G_STRUCT_OFFSET (MonoLMF, previous_lmf));
- ARM_STR_IMM (code, ARMREG_R2, ARMREG_R1, G_STRUCT_OFFSET (MonoLMF, previous_lmf));
+ ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, previous_lmf));
/* *(lmf_addr) = r1 */
- ARM_STR_IMM (code, ARMREG_R1, ARMREG_R0, G_STRUCT_OFFSET (MonoLMF, previous_lmf));
+ ARM_STR_IMM (code, ARMREG_V1, ARMREG_R0, G_STRUCT_OFFSET (MonoLMF, previous_lmf));
/* save method info (it's in v2) */
if ((tramp_type == MONO_TRAMPOLINE_JIT) || (tramp_type == MONO_TRAMPOLINE_JUMP))
- ARM_STR_IMM (code, ARMREG_V2, ARMREG_R1, G_STRUCT_OFFSET (MonoLMF, method));
+ ARM_STR_IMM (code, ARMREG_V2, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, method));
else {
ARM_MOV_REG_IMM8 (code, ARMREG_R2, 0);
- ARM_STR_IMM (code, ARMREG_R2, ARMREG_R1, G_STRUCT_OFFSET (MonoLMF, method));
+ ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, method));
}
- /* Save sp into lmf->iregs, the eh code expects it to be at IP */
+ /* save caller SP */
ARM_ADD_REG_IMM8 (code, ARMREG_R2, ARMREG_SP, cfa_offset);
- ARM_STR_IMM (code, ARMREG_R2, ARMREG_R1, G_STRUCT_OFFSET (MonoLMF, iregs) + (ARMREG_IP * sizeof (mgreg_t)));
- ARM_STR_IMM (code, ARMREG_SP, ARMREG_R1, G_STRUCT_OFFSET (MonoLMF, esp));
+ ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, sp));
+ /* save caller FP */
+ ARM_LDR_IMM (code, ARMREG_R2, ARMREG_V1, (G_STRUCT_OFFSET (MonoLMF, iregs) + ARMREG_FP*4));
+ ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, fp));
/* save the IP (caller ip) */
if (tramp_type == MONO_TRAMPOLINE_JUMP) {
ARM_MOV_REG_IMM8 (code, ARMREG_R2, 0);
} else {
- /* assumes STACK == sizeof (MonoLMF) */
- ARM_LDR_IMM (code, ARMREG_R2, ARMREG_SP, (G_STRUCT_OFFSET (MonoLMF, iregs) + 13*4));
+ ARM_LDR_IMM (code, ARMREG_R2, ARMREG_V1, (G_STRUCT_OFFSET (MonoLMF, iregs) + 13*4));
}
- ARM_STR_IMM (code, ARMREG_R2, ARMREG_R1, G_STRUCT_OFFSET (MonoLMF, eip));
+ ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, ip));
/*
* Now we're ready to call xxx_trampoline ().
*/
- /* Arg 1: the saved registers. It was put in v1 */
- ARM_MOV_REG_REG (code, ARMREG_R0, ARMREG_V1);
+ /* Arg 1: the saved registers */
+ ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, iregs));
/* Arg 2: code (next address to the instruction that called us) */
if (tramp_type == MONO_TRAMPOLINE_JUMP) {
ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
code = emit_bx (code, ARMREG_IP);
-
+
/* OK, code address is now on r0. Move it to the place on the stack
* where IP was saved (it is now no more useful to us and it can be
* clobbered). This way we can just restore all the regs in one inst
* and branch to IP.
*/
- ARM_STR_IMM (code, ARMREG_R0, ARMREG_V1, (ARMREG_R12 * sizeof (mgreg_t)));
+ ARM_STR_IMM (code, ARMREG_R0, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, iregs) + (ARMREG_R12 * sizeof (mgreg_t)));
/* Check for thread interruption */
/* This is not perf critical code so no need to check the interrupt flag */
* Now we restore the MonoLMF (see emit_epilogue in mini-arm.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 r2.
*/
- ARM_MOV_REG_REG (code, ARMREG_R2, ARMREG_SP);
/* ip = previous_lmf */
- ARM_LDR_IMM (code, ARMREG_IP, ARMREG_R2, G_STRUCT_OFFSET (MonoLMF, previous_lmf));
+ ARM_LDR_IMM (code, ARMREG_IP, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, previous_lmf));
/* lr = lmf_addr */
- ARM_LDR_IMM (code, ARMREG_LR, ARMREG_R2, G_STRUCT_OFFSET (MonoLMF, lmf_addr));
+ ARM_LDR_IMM (code, ARMREG_LR, ARMREG_V1, G_STRUCT_OFFSET (MonoLMF, lmf_addr));
/* *(lmf_addr) = previous_lmf */
ARM_STR_IMM (code, ARMREG_IP, ARMREG_LR, G_STRUCT_OFFSET (MonoLMF, previous_lmf));
/* Restore the registers and jump to the code:
* Note that IP has been conveniently set to the method addr.
*/
- ARM_ADD_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, sizeof (MonoLMF) - sizeof (mgreg_t) * 14);
+ ARM_ADD_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, STACK - regsave_size);
ARM_POP_NWB (code, 0x5fff);
if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
ARM_MOV_REG_REG (code, ARMREG_R0, ARMREG_IP);
- /* do we need to set sp? */
- ARM_ADD_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, (14 * sizeof (mgreg_t)));
+ ARM_ADD_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, regsave_size);
if ((tramp_type == MONO_TRAMPOLINE_CLASS_INIT) || (tramp_type == MONO_TRAMPOLINE_GENERIC_CLASS_INIT) || (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH))
code = emit_bx (code, ARMREG_LR);
else
mono_domain_lock (domain);
code = buf = mono_domain_code_reserve_align (domain, size, 4);
- if ((short_branch = branch_for_target_reachable (code + 8, tramp))) {
+ if ((short_branch = branch_for_target_reachable (code + 4, tramp))) {
size = 12;
mono_domain_code_commit (domain, code, SPEC_TRAMP_SIZE, size);
}
{
guint32 ins = ((guint32*)(gpointer)code) [-1];
+#if MONOTOUCH
+ /* Should be a 'bl' or a 'b' */
+ if (((ins >> 25) & 0x7) == 0x5) {
+#else
/* Should be a 'bl' */
if ((((ins >> 25) & 0x7) == 0x5) && (((ins >> 24) & 0x1) == 0x1)) {
+#endif
gint32 disp = ((gint32)ins) & 0xffffff;
guint8 *target = code - 4 + 8 + (disp * 4);
projects / mono.git / blobdiff