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remotelaboratory/lib/ffts/src/arch/arm/tramp.c

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/*
* Create trampolines to invoke arbitrary functions.
* Copyright (c) 2002 Sergey Chaban <serge@wildwestsoftware.com>
*
* Contributions by Malte Hildingson
*/
#include "arm-codegen.h"
#include "arm-dis.h"
#if defined(_WIN32_WCE) || defined (UNDER_CE)
# include <windows.h>
#else
#include <unistd.h>
#include <sys/mman.h>
#endif
#if !defined(PLATFORM_MACOSX)
#include <errno.h>
#include "mono/metadata/class.h"
#include "mono/metadata/tabledefs.h"
#include "mono/interpreter/interp.h"
#include "mono/metadata/appdomain.h"
#if 0
# define ARM_DUMP_DISASM 1
#endif
/* prototypes for private functions (to avoid compiler warnings) */
void flush_icache (void);
void* alloc_code_buff (int num_instr);
/*
* The resulting function takes the form:
* void func (void (*callme)(), void *retval, void *this_obj, stackval *arguments);
* NOTE: all args passed in ARM registers (A1-A4),
* then copied to R4-R7 (see definitions below).
*/
#define REG_FUNC_ADDR ARMREG_R4
#define REG_RETVAL ARMREG_R5
#define REG_THIS ARMREG_R6
#define REG_ARGP ARMREG_R7
#define ARG_SIZE sizeof(stackval)
void flush_icache ()
{
#if defined(_WIN32)
FlushInstructionCache(GetCurrentProcess(), NULL, 0);
#else
# if 0
asm ("mov r0, r0");
asm ("mov r0, #0");
asm ("mcr p15, 0, r0, c7, c7, 0");
# else
/* TODO: use (movnv pc, rx) method */
# endif
#endif
}
void* alloc_code_buff (int num_instr)
{
void* code_buff;
int code_size = num_instr * sizeof(arminstr_t);
#if defined(_WIN32) || defined(UNDER_CE)
int old_prot = 0;
code_buff = malloc(code_size);
VirtualProtect(code_buff, code_size, PAGE_EXECUTE_READWRITE, &old_prot);
#else
int page_size = sysconf(_SC_PAGESIZE);
int new_code_size;
new_code_size = code_size + page_size - 1;
code_buff = malloc(new_code_size);
code_buff = (void *) (((int) code_buff + page_size - 1) & ~(page_size - 1));
if (mprotect(code_buff, code_size, PROT_READ|PROT_WRITE|PROT_EXEC) != 0) {
g_critical (G_GNUC_PRETTY_FUNCTION
": mprotect error: %s", g_strerror (errno));
}
#endif
return code_buff;
}
/*
* Refer to ARM Procedure Call Standard (APCS) for more info.
*/
MonoPIFunc mono_arch_create_trampoline (MonoMethodSignature *sig, gboolean string_ctor)
{
MonoType* param;
MonoPIFunc code_buff;
arminstr_t* p;
guint32 code_size, stack_size;
guint32 simple_type;
int i, hasthis, aregs, regc, stack_offs;
int this_loaded;
guchar reg_alloc [ARM_NUM_ARG_REGS];
/* pessimistic estimation for prologue/epilogue size */
code_size = 16 + 16;
/* push/pop work regs */
code_size += 2;
/* call */
code_size += 2;
/* handle retval */
code_size += 2;
stack_size = 0;
hasthis = sig->hasthis ? 1 : 0;
aregs = ARM_NUM_ARG_REGS - hasthis;
for (i = 0, regc = aregs; i < sig->param_count; ++i) {
param = sig->params [i];
/* keep track of argument sizes */
if (i < ARM_NUM_ARG_REGS) reg_alloc [i] = 0;
if (param->byref) {
if (regc > 0) {
code_size += 1;
reg_alloc [i] = regc;
--regc;
} else {
code_size += 2;
stack_size += sizeof(gpointer);
}
} else {
simple_type = param->type;
enum_calc_size:
switch (simple_type) {
case MONO_TYPE_BOOLEAN:
case MONO_TYPE_CHAR:
case MONO_TYPE_I1:
case MONO_TYPE_U1:
case MONO_TYPE_I2:
case MONO_TYPE_U2:
case MONO_TYPE_I4:
case MONO_TYPE_U4:
case MONO_TYPE_I:
case MONO_TYPE_U:
case MONO_TYPE_PTR:
case MONO_TYPE_R4:
case MONO_TYPE_SZARRAY:
case MONO_TYPE_CLASS:
case MONO_TYPE_OBJECT:
case MONO_TYPE_STRING:
if (regc > 0) {
/* register arg */
code_size += 1;
reg_alloc [i] = regc;
--regc;
} else {
/* stack arg */
code_size += 2;
stack_size += 4;
}
break;
case MONO_TYPE_I8:
case MONO_TYPE_U8:
case MONO_TYPE_R8:
/* keep track of argument sizes */
if (regc > 1) {
/* fits into registers, two LDRs */
code_size += 2;
reg_alloc [i] = regc;
regc -= 2;
} else if (regc > 0) {
/* first half fits into register, one LDR */
code_size += 1;
reg_alloc [i] = regc;
--regc;
/* the rest on the stack, LDR/STR */
code_size += 2;
stack_size += 4;
} else {
/* stack arg, 4 instrs - 2x(LDR/STR) */
code_size += 4;
stack_size += 2 * 4;
}
break;
case MONO_TYPE_VALUETYPE:
if (param->data.klass->enumtype) {
simple_type = param->data.klass->enum_basetype->type;
goto enum_calc_size;
}
if (mono_class_value_size(param->data.klass, NULL) != 4) {
g_error("can only marshal enums, not generic structures (size: %d)", mono_class_value_size(param->data.klass, NULL));
}
if (regc > 0) {
/* register arg */
code_size += 1;
reg_alloc [i] = regc;
--regc;
} else {
/* stack arg */
code_size += 2;
stack_size += 4;
}
break;
default :
break;
}
}
}
code_buff = (MonoPIFunc)alloc_code_buff(code_size);
p = (arminstr_t*)code_buff;
/* prologue */
p = arm_emit_lean_prologue(p, stack_size,
/* save workset (r4-r7) */
(1 << ARMREG_R4) | (1 << ARMREG_R5) | (1 << ARMREG_R6) | (1 << ARMREG_R7));
/* copy args into workset */
/* callme - always present */
ARM_MOV_REG_REG(p, ARMREG_R4, ARMREG_A1);
/* retval */
if (sig->ret->byref || string_ctor || (sig->ret->type != MONO_TYPE_VOID)) {
ARM_MOV_REG_REG(p, ARMREG_R5, ARMREG_A2);
}
/* this_obj */
if (sig->hasthis) {
this_loaded = 0;
if (stack_size == 0) {
ARM_MOV_REG_REG(p, ARMREG_A1, ARMREG_A3);
this_loaded = 1;
} else {
ARM_MOV_REG_REG(p, ARMREG_R6, ARMREG_A3);
}
}
/* args */
if (sig->param_count != 0) {
ARM_MOV_REG_REG(p, ARMREG_R7, ARMREG_A4);
}
stack_offs = stack_size;
/* handle arguments */
/* in reverse order so we could use r0 (arg1) for memory transfers */
for (i = sig->param_count; --i >= 0;) {
param = sig->params [i];
if (param->byref) {
if (i < aregs && reg_alloc[i] > 0) {
ARM_LDR_IMM(p, ARMREG_A1 + i, REG_ARGP, i*ARG_SIZE);
} else {
stack_offs -= sizeof(armword_t);
ARM_LDR_IMM(p, ARMREG_R0, REG_ARGP, i*ARG_SIZE);
ARM_STR_IMM(p, ARMREG_R0, ARMREG_SP, stack_offs);
}
} else {
simple_type = param->type;
enum_marshal:
switch (simple_type) {
case MONO_TYPE_BOOLEAN:
case MONO_TYPE_CHAR:
case MONO_TYPE_I1:
case MONO_TYPE_U1:
case MONO_TYPE_I2:
case MONO_TYPE_U2:
case MONO_TYPE_I4:
case MONO_TYPE_U4:
case MONO_TYPE_I:
case MONO_TYPE_U:
case MONO_TYPE_PTR:
case MONO_TYPE_R4:
case MONO_TYPE_SZARRAY:
case MONO_TYPE_CLASS:
case MONO_TYPE_OBJECT:
case MONO_TYPE_STRING:
if (i < aregs && reg_alloc [i] > 0) {
/* pass in register */
ARM_LDR_IMM(p, ARMREG_A1 + hasthis + (aregs - reg_alloc [i]), REG_ARGP, i*ARG_SIZE);
} else {
stack_offs -= sizeof(armword_t);
ARM_LDR_IMM(p, ARMREG_R0, REG_ARGP, i*ARG_SIZE);
ARM_STR_IMM(p, ARMREG_R0, ARMREG_SP, stack_offs);
}
break;
case MONO_TYPE_I8:
case MONO_TYPE_U8:
case MONO_TYPE_R8:
if (i < aregs && reg_alloc [i] > 0) {
if (reg_alloc [i] > 1) {
/* pass in registers */
ARM_LDR_IMM(p, ARMREG_A1 + hasthis + (aregs - reg_alloc [i]), REG_ARGP, i*ARG_SIZE);
ARM_LDR_IMM(p, ARMREG_A1 + hasthis + (aregs - reg_alloc [i]) + 1, REG_ARGP, i*ARG_SIZE + 4);
} else {
stack_offs -= sizeof(armword_t);
ARM_LDR_IMM(p, ARMREG_R0, REG_ARGP, i*ARG_SIZE + 4);
ARM_STR_IMM(p, ARMREG_R0, ARMREG_SP, stack_offs);
ARM_LDR_IMM(p, ARMREG_A1 + hasthis + (aregs - reg_alloc [i]), REG_ARGP, i*ARG_SIZE);
}
} else {
/* two words transferred on the stack */
stack_offs -= 2*sizeof(armword_t);
ARM_LDR_IMM(p, ARMREG_R0, REG_ARGP, i*ARG_SIZE);
ARM_STR_IMM(p, ARMREG_R0, ARMREG_SP, stack_offs);
ARM_LDR_IMM(p, ARMREG_R0, REG_ARGP, i*ARG_SIZE + 4);
ARM_STR_IMM(p, ARMREG_R0, ARMREG_SP, stack_offs + 4);
}
break;
case MONO_TYPE_VALUETYPE:
if (param->data.klass->enumtype) {
/* it's an enum value, proceed based on its base type */
simple_type = param->data.klass->enum_basetype->type;
goto enum_marshal;
} else {
if (i < aregs && reg_alloc[i] > 0) {
int vtreg = ARMREG_A1 + hasthis +
hasthis + (aregs - reg_alloc[i]);
ARM_LDR_IMM(p, vtreg, REG_ARGP, i * ARG_SIZE);
ARM_LDR_IMM(p, vtreg, vtreg, 0);
} else {
stack_offs -= sizeof(armword_t);
ARM_LDR_IMM(p, ARMREG_R0, REG_ARGP, i * ARG_SIZE);
ARM_LDR_IMM(p, ARMREG_R0, ARMREG_R0, 0);
ARM_STR_IMM(p, ARMREG_R0, ARMREG_SP, stack_offs);
}
}
break;
default:
break;
}
}
}
if (sig->hasthis && !this_loaded) {
/* [this] always passed in A1, regardless of sig->call_convention */
ARM_MOV_REG_REG(p, ARMREG_A1, REG_THIS);
}
/* call [func] */
ARM_MOV_REG_REG(p, ARMREG_LR, ARMREG_PC);
ARM_MOV_REG_REG(p, ARMREG_PC, REG_FUNC_ADDR);
/* handle retval */
if (sig->ret->byref || string_ctor) {
ARM_STR_IMM(p, ARMREG_R0, REG_RETVAL, 0);
} else {
simple_type = sig->ret->type;
enum_retvalue:
switch (simple_type) {
case MONO_TYPE_BOOLEAN:
case MONO_TYPE_I1:
case MONO_TYPE_U1:
ARM_STRB_IMM(p, ARMREG_R0, REG_RETVAL, 0);
break;
case MONO_TYPE_CHAR:
case MONO_TYPE_I2:
case MONO_TYPE_U2:
ARM_STRH_IMM(p, ARMREG_R0, REG_RETVAL, 0);
break;
/*
* A 32-bit integer and integer-equivalent return value
* is returned in R0.
* Single-precision floating-point values are returned in R0.
*/
case MONO_TYPE_I:
case MONO_TYPE_U:
case MONO_TYPE_I4:
case MONO_TYPE_U4:
case MONO_TYPE_R4:
case MONO_TYPE_OBJECT:
case MONO_TYPE_CLASS:
case MONO_TYPE_ARRAY:
case MONO_TYPE_SZARRAY:
case MONO_TYPE_STRING:
ARM_STR_IMM(p, ARMREG_R0, REG_RETVAL, 0);
break;
/*
* A 64-bit integer is returned in R0 and R1.
* Double-precision floating-point values are returned in R0 and R1.
*/
case MONO_TYPE_I8:
case MONO_TYPE_U8:
case MONO_TYPE_R8:
ARM_STR_IMM(p, ARMREG_R0, REG_RETVAL, 0);
ARM_STR_IMM(p, ARMREG_R1, REG_RETVAL, 4);
break;
case MONO_TYPE_VALUETYPE:
if (sig->ret->data.klass->enumtype) {
simple_type = sig->ret->data.klass->enum_basetype->type;
goto enum_retvalue;
}
break;
case MONO_TYPE_VOID:
break;
default:
break;
}
}
p = arm_emit_std_epilogue(p, stack_size,
/* restore R4-R7 */
(1 << ARMREG_R4) | (1 << ARMREG_R5) | (1 << ARMREG_R6) | (1 << ARMREG_R7));
flush_icache();
#ifdef ARM_DUMP_DISASM
_armdis_decode((arminstr_t*)code_buff, ((guint8*)p) - ((guint8*)code_buff));
#endif
return code_buff;
}
#define MINV_OFFS(member) G_STRUCT_OFFSET(MonoInvocation, member)
/*
* Returns a pointer to a native function that can be used to
* call the specified method.
* The function created will receive the arguments according
* to the call convention specified in the method.
* This function works by creating a MonoInvocation structure,
* filling the fields in and calling ves_exec_method on it.
* Still need to figure out how to handle the exception stuff
* across the managed/unmanaged boundary.
*/
void* mono_arch_create_method_pointer (MonoMethod* method)
{
MonoMethodSignature* sig;
guchar* p, * p_method, * p_stackval_from_data, * p_exec;
void* code_buff;
int i, stack_size, arg_pos, arg_add, stackval_pos, offs;
int areg, reg_args, shift, pos;
MonoJitInfo *ji;
code_buff = alloc_code_buff(128);
p = (guchar*)code_buff;
sig = method->signature;
ARM_B(p, 3);
/* embed magic number followed by method pointer */
*p++ = 'M';
*p++ = 'o';
*p++ = 'n';
*p++ = 'o';
/* method ptr */
*(void**)p = method;
p_method = p;
p += 4;
/* call table */
*(void**)p = stackval_from_data;
p_stackval_from_data = p;
p += 4;
*(void**)p = ves_exec_method;
p_exec = p;
p += 4;
stack_size = sizeof(MonoInvocation) + ARG_SIZE*(sig->param_count + 1) + ARM_NUM_ARG_REGS*2*sizeof(armword_t);
/* prologue */
p = (guchar*)arm_emit_lean_prologue((arminstr_t*)p, stack_size,
(1 << ARMREG_R4) |
(1 << ARMREG_R5) |
(1 << ARMREG_R6) |
(1 << ARMREG_R7));
/* R7 - ptr to stack args */
ARM_MOV_REG_REG(p, ARMREG_R7, ARMREG_IP);
/*
* Initialize MonoInvocation fields, first the ones known now.
*/
ARM_MOV_REG_IMM8(p, ARMREG_R4, 0);
ARM_STR_IMM(p, ARMREG_R4, ARMREG_SP, MINV_OFFS(ex));
ARM_STR_IMM(p, ARMREG_R4, ARMREG_SP, MINV_OFFS(ex_handler));
ARM_STR_IMM(p, ARMREG_R4, ARMREG_SP, MINV_OFFS(parent));
/* Set the method pointer. */
ARM_LDR_IMM(p, ARMREG_R4, ARMREG_PC, -(int)(p - p_method + sizeof(arminstr_t)*2));
ARM_STR_IMM(p, ARMREG_R4, ARMREG_SP, MINV_OFFS(method));
if (sig->hasthis) {
/* [this] in A1 */
ARM_STR_IMM(p, ARMREG_A1, ARMREG_SP, MINV_OFFS(obj));
} else {
/* else set minv.obj to NULL */
ARM_STR_IMM(p, ARMREG_R4, ARMREG_SP, MINV_OFFS(obj));
}
/* copy args from registers to stack */
areg = ARMREG_A1 + sig->hasthis;
arg_pos = -(int)(ARM_NUM_ARG_REGS - sig->hasthis) * 2 * sizeof(armword_t);
arg_add = 0;
for (i = 0; i < sig->param_count; ++i) {
if (areg >= ARM_NUM_ARG_REGS) break;
ARM_STR_IMM(p, areg, ARMREG_R7, arg_pos);
++areg;
if (!sig->params[i]->byref) {
switch (sig->params[i]->type) {
case MONO_TYPE_I8:
case MONO_TYPE_U8:
case MONO_TYPE_R8:
if (areg >= ARM_NUM_ARG_REGS) {
/* load second half of 64-bit arg */
ARM_LDR_IMM(p, ARMREG_R4, ARMREG_R7, 0);
ARM_STR_IMM(p, ARMREG_R4, ARMREG_R7, arg_pos + sizeof(armword_t));
arg_add = sizeof(armword_t);
} else {
/* second half is already the register */
ARM_STR_IMM(p, areg, ARMREG_R7, arg_pos + sizeof(armword_t));
++areg;
}
break;
case MONO_TYPE_VALUETYPE:
/* assert */
default:
break;
}
}
arg_pos += 2 * sizeof(armword_t);
}
/* number of args passed in registers */
reg_args = i;
/*
* Calc and save stack args ptr,
* args follow MonoInvocation struct on the stack.
*/
ARM_ADD_REG_IMM8(p, ARMREG_R1, ARMREG_SP, sizeof(MonoInvocation));
ARM_STR_IMM(p, ARMREG_R1, ARMREG_SP, MINV_OFFS(stack_args));
/* convert method args to stackvals */
arg_pos = -(int)(ARM_NUM_ARG_REGS - sig->hasthis) * 2 * sizeof(armword_t);
stackval_pos = sizeof(MonoInvocation);
for (i = 0; i < sig->param_count; ++i) {
if (i < reg_args) {
ARM_SUB_REG_IMM8(p, ARMREG_A3, ARMREG_R7, -arg_pos);
arg_pos += 2 * sizeof(armword_t);
} else {
if (arg_pos < 0) arg_pos = 0;
pos = arg_pos + arg_add;
if (pos <= 0xFF) {
ARM_ADD_REG_IMM8(p, ARMREG_A3, ARMREG_R7, pos);
} else {
if (is_arm_const((armword_t)pos)) {
shift = calc_arm_mov_const_shift((armword_t)pos);
ARM_ADD_REG_IMM(p, ARMREG_A3, ARMREG_R7, pos >> ((32 - shift) & 31), shift >> 1);
} else {
p = (guchar*)arm_mov_reg_imm32((arminstr_t*)p, ARMREG_R6, (armword_t)pos);
ARM_ADD_REG_REG(p, ARMREG_A2, ARMREG_R7, ARMREG_R6);
}
}
arg_pos += sizeof(armword_t);
if (!sig->params[i]->byref) {
switch (sig->params[i]->type) {
case MONO_TYPE_I8:
case MONO_TYPE_U8:
case MONO_TYPE_R8:
arg_pos += sizeof(armword_t);
break;
case MONO_TYPE_VALUETYPE:
/* assert */
default:
break;
}
}
}
/* A2 = result */
if (stackval_pos <= 0xFF) {
ARM_ADD_REG_IMM8(p, ARMREG_A2, ARMREG_SP, stackval_pos);
} else {
if (is_arm_const((armword_t)stackval_pos)) {
shift = calc_arm_mov_const_shift((armword_t)stackval_pos);
ARM_ADD_REG_IMM(p, ARMREG_A2, ARMREG_SP, stackval_pos >> ((32 - shift) & 31), shift >> 1);
} else {
p = (guchar*)arm_mov_reg_imm32((arminstr_t*)p, ARMREG_R6, (armword_t)stackval_pos);
ARM_ADD_REG_REG(p, ARMREG_A2, ARMREG_SP, ARMREG_R6);
}
}
/* A1 = type */
p = (guchar*)arm_mov_reg_imm32((arminstr_t*)p, ARMREG_A1, (armword_t)sig->params [i]);
stackval_pos += ARG_SIZE;
offs = -(p + 2*sizeof(arminstr_t) - p_stackval_from_data);
/* load function address */
ARM_LDR_IMM(p, ARMREG_R4, ARMREG_PC, offs);
/* call stackval_from_data */
ARM_MOV_REG_REG(p, ARMREG_LR, ARMREG_PC);
ARM_MOV_REG_REG(p, ARMREG_PC, ARMREG_R4);
}
/* store retval ptr */
p = (guchar*)arm_mov_reg_imm32((arminstr_t*)p, ARMREG_R5, (armword_t)stackval_pos);
ARM_ADD_REG_REG(p, ARMREG_R5, ARMREG_SP, ARMREG_R4);
ARM_STR_IMM(p, ARMREG_R5, ARMREG_SP, MINV_OFFS(retval));
/*
* Call the method.
*/
/* A1 = MonoInvocation ptr */
ARM_MOV_REG_REG(p, ARMREG_A1, ARMREG_SP);
offs = -(p + 2*sizeof(arminstr_t) - p_exec);
/* load function address */
ARM_LDR_IMM(p, ARMREG_R4, ARMREG_PC, offs);
/* call ves_exec */
ARM_MOV_REG_REG(p, ARMREG_LR, ARMREG_PC);
ARM_MOV_REG_REG(p, ARMREG_PC, ARMREG_R4);
/*
* Move retval into reg.
*/
if (sig->ret->byref) {
ARM_LDR_IMM(p, ARMREG_R0, ARMREG_R5, 0);
} else {
switch (sig->ret->type) {
case MONO_TYPE_BOOLEAN:
case MONO_TYPE_I1:
case MONO_TYPE_U1:
ARM_LDRB_IMM(p, ARMREG_R0, ARMREG_R5, 0);
break;
case MONO_TYPE_CHAR:
case MONO_TYPE_I2:
case MONO_TYPE_U2:
ARM_LDRH_IMM(p, ARMREG_R0, ARMREG_R5, 0);
break;
case MONO_TYPE_I:
case MONO_TYPE_U:
case MONO_TYPE_I4:
case MONO_TYPE_U4:
case MONO_TYPE_R4:
case MONO_TYPE_OBJECT:
case MONO_TYPE_CLASS:
case MONO_TYPE_ARRAY:
case MONO_TYPE_SZARRAY:
ARM_LDR_IMM(p, ARMREG_R0, ARMREG_R5, 0);
break;
case MONO_TYPE_I8:
case MONO_TYPE_U8:
case MONO_TYPE_R8:
ARM_LDR_IMM(p, ARMREG_R0, ARMREG_R5, 0);
ARM_LDR_IMM(p, ARMREG_R1, ARMREG_R5, 4);
break;
case MONO_TYPE_VOID:
default:
break;
}
}
p = (guchar*)arm_emit_std_epilogue((arminstr_t*)p, stack_size,
(1 << ARMREG_R4) |
(1 << ARMREG_R5) |
(1 << ARMREG_R6) |
(1 << ARMREG_R7));
flush_icache();
#ifdef ARM_DUMP_DISASM
_armdis_decode((arminstr_t*)code_buff, ((guint8*)p) - ((guint8*)code_buff));
#endif
ji = g_new0(MonoJitInfo, 1);
ji->method = method;
ji->code_size = ((guint8 *) p) - ((guint8 *) code_buff);
ji->code_start = (gpointer) code_buff;
mono_jit_info_table_add(mono_get_root_domain (), ji);
return code_buff;
}
/*
* mono_create_method_pointer () will insert a pointer to the MonoMethod
* so that the interp can easily get at the data: this function will retrieve
* the method from the code stream.
*/
MonoMethod* mono_method_pointer_get (void* code)
{
unsigned char* c = code;
/* check out magic number that follows unconditional branch */
if (c[4] == 'M' &&
c[5] == 'o' &&
c[6] == 'n' &&
c[7] == 'o') return ((MonoMethod**)code)[2];
return NULL;
}
#endif
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