* 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
guint32 offset = ((guint32*)code)[2];
jump_entry = code + offset + 12;
+ } else if (*(guint16*)(code - 4) == 0xf8df) {
+ /*
+ * Thumb PLT entry, begins with ldr.w ip, [pc, #8], code points to entry + 4, see
+ * mono_arm_get_thumb_plt_entry ().
+ */
+ guint32 offset;
+
+ code -= 4;
+ offset = *(guint32*)(code + 12);
+ jump_entry = code + offset + 8;
} else {
g_assert_not_reached ();
}
/* 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 (gpointer) * 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
// CFA = SP + (num registers pushed) * 4
- cfa_offset = 14 * sizeof (gpointer);
+ cfa_offset = 14 * sizeof (mgreg_t);
mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, cfa_offset);
// 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 (guint) * 14);
- cfa_offset += sizeof (MonoLMF) - sizeof (guint) * 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 * 4));
- 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 * 4));
+ 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 (guint) * 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 * 4));
+ 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
nullified_class_init_trampoline = mono_arch_get_nullified_class_init_trampoline (NULL);
if (info)
- *info = mono_tramp_info_create (g_strdup_printf ("generic_trampoline_%d", tramp_type), buf, code - buf, ji, unwind_ops);
+ *info = mono_tramp_info_create (mono_get_generic_trampoline_name (tramp_type), buf, code - buf, ji, unwind_ops);
return buf;
}
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);
}
/*
* mono_arch_get_unbox_trampoline:
- * @gsctx: the generic sharing context
* @m: method pointer
* @addr: pointer to native code for @m
*
* unboxing before calling the method
*/
gpointer
-mono_arch_get_unbox_trampoline (MonoGenericSharingContext *gsctx, MonoMethod *m, gpointer addr)
+mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
{
guint8 *code, *start;
MonoDomain *domain = mono_domain_get ();
gboolean mrgctx;
MonoJumpInfo *ji = NULL;
GSList *unwind_ops = NULL;
- char *name;
mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
index = MONO_RGCTX_SLOT_INDEX (slot);
g_assert (code - buf <= tramp_size);
- name = g_strdup_printf ("rgctx_fetch_trampoline_%s_%d", mrgctx ? "mrgctx" : "rgctx", MONO_RGCTX_SLOT_INDEX (slot));
- mono_save_trampoline_xdebug_info (name, buf, code - buf, unwind_ops);
- g_free (name);
-
if (info)
- *info = mono_tramp_info_create (g_strdup_printf ("rgctx_fetch_trampoline_%u", slot), buf, code - buf, ji, unwind_ops);
+ *info = mono_tramp_info_create (mono_get_rgctx_fetch_trampoline_name (slot), buf, code - buf, ji, unwind_ops);
return buf;
}
}
gpointer
-mono_arch_get_unbox_trampoline (MonoGenericSharingContext *gsctx, MonoMethod *m, gpointer addr)
+mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
{
g_assert_not_reached ();
return NULL;
{
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);
/* The offset is stored as the 4th word of the plt entry */
return ((guint32*)plt_entry) [3];
}
+
+/*
+ * Return the address of the PLT entry called by the thumb code CODE.
+ */
+guint8*
+mono_arm_get_thumb_plt_entry (guint8 *code)
+{
+ int s, j1, j2, imm10, imm11, i1, i2, imm32;
+ guint8 *bl, *base;
+ guint16 t1, t2;
+ guint8 *target;
+
+ /* code should be right after a BL */
+ code = (guint8*)((mgreg_t)code & ~1);
+ base = (guint8*)((mgreg_t)code & ~3);
+ bl = code - 4;
+ t1 = ((guint16*)bl) [0];
+ t2 = ((guint16*)bl) [1];
+
+ g_assert ((t1 >> 11) == 0x1e);
+
+ s = (t1 >> 10) & 0x1;
+ imm10 = (t1 >> 0) & 0x3ff;
+ j1 = (t2 >> 13) & 0x1;
+ j2 = (t2 >> 11) & 0x1;
+ imm11 = t2 & 0x7ff;
+
+ i1 = (s ^ j1) ? 0 : 1;
+ i2 = (s ^ j2) ? 0 : 1;
+
+ imm32 = (imm11 << 1) | (imm10 << 12) | (i2 << 22) | (i1 << 23);
+ // FIXME:
+ g_assert (s == 0);
+
+ target = code + imm32;
+
+ /* target now points to the thumb plt entry */
+ /* ldr.w r12, [pc, #8] */
+ g_assert (((guint16*)target) [0] == 0xf8df);
+ g_assert (((guint16*)target) [1] == 0xc008);
+
+ /*
+ * The PLT info offset is at offset 16, but mono_arch_get_plt_entry_offset () returns
+ * the 3rd word, so compensate by returning a different value.
+ */
+ target += 4;
+
+ return target;
+}
projects / mono.git / blobdiff