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/* Trampoline construction */
/*
* Copyright 1995-1999, 2001-2004 Bruno Haible, <bruno@clisp.org>
*
* This is free software distributed under the GNU General Public Licence
* described in the file COPYING. Contact the author if you don't have this
* or can't live with it. There is ABSOLUTELY NO WARRANTY, explicit or implied,
* on this software.
*/
#include "config.h"
#include "trampoline_r.h"
#if defined(__hppa__)
#if 0
#define __hppaold__ /* Old trampoline, real machine code. */
#else
#define __hppanew__ /* New trampoline, just a closure. */
#endif
#endif
#if defined(__rs6000__)
#if defined(__NetBSD__)
#define __rs6000netbsd__
#else
#if !defined(_AIX)
#define __rs6000sysv4__ /* SysV.4 ABI, real machine code. */
#else
#define __rs6000aix__ /* AIX ABI, just a closure. */
#endif
#endif
#endif
#if defined(__hppanew__)
/*
* A function pointer is a biased pointer to a data area whose first word
* contains the actual address of the function.
*/
extern void tramp_r (); /* trampoline prototype */
/* We don't need to take any special measures to make the code executable
* since the actual instructions are in the text segment.
*/
#ifndef CODE_EXECUTABLE
#define CODE_EXECUTABLE
#endif
#endif
#if defined(__rs6000aix__) || defined(__ia64__)
/*
* A function pointer is a pointer to a data area whose first word contains
* the actual address of the function.
*/
extern void (*tramp_r) (); /* trampoline prototype */
/* We don't need to take any special measures to make the code executable
* since the actual instructions are in the text segment.
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/* Trampoline construction */
/*
* Copyright 1995-1999, 2001-2006 Bruno Haible, <bruno@clisp.org>
*
* This is free software distributed under the GNU General Public Licence
* described in the file COPYING. Contact the author if you don't have this
* or can't live with it. There is ABSOLUTELY NO WARRANTY, explicit or implied,
* on this software.
*/
#include "config.h"
#include "trampoline_r.h"
#if defined(__hppa__)
#if 0
#define __hppaold__ /* Old trampoline, real machine code. */
#else
#define __hppanew__ /* New trampoline, just a closure. */
#endif
#endif
#if defined(__powerpc__) && !defined(__powerpc64__)
#if !defined(_AIX)
#define __powerpcsysv4__ /* SysV.4 ABI, real machine code. */
#else
#define __powerpcaix__ /* AIX ABI, just a closure. */
#endif
#endif
#if defined(__powerpc64__)
/* The only ABI on powerpc64 known so far is the AIX ABI. */
#define __powerpc64aix__ /* AIX ABI, just a closure. */
#endif
#if defined(__hppanew__)
/*
* A function pointer is a biased pointer to a data area whose first word
* contains the actual address of the function.
*/
extern void tramp_r (); /* trampoline prototype */
/* We don't need to take any special measures to make the code executable
* since the actual instructions are in the text segment.
*/
#ifndef CODE_EXECUTABLE
#define CODE_EXECUTABLE
#endif
#endif
#if defined(__powerpcaix__) || defined(__powerpc64aix__) || defined(__ia64__)
/*
* A function pointer is a pointer to a data area whose first word contains
* the actual address of the function.
*/
extern void (*tramp_r) (); /* trampoline prototype */
/* We don't need to take any special measures to make the code executable
* since the actual instructions are in the text segment.
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#include <unistd.h>
#endif
/* Declare getpagesize(). */
#ifdef HAVE_GETPAGESIZE
#ifdef __cplusplus
extern "C" RETGETPAGESIZETYPE getpagesize (void);
#elif defined(__STDC__)
extern RETGETPAGESIZETYPE getpagesize (void);
extern RETGETPAGESIZETYPE getpagesize ();
#endif
#else
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#else
/* Not Unix, e.g. mingw32 */
#define PAGESIZE 4096
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#include <unistd.h>
#endif
/* Declare getpagesize(). */
#ifdef HAVE_GETPAGESIZE
#ifdef __cplusplus
extern "C" RETGETPAGESIZETYPE getpagesize (void);
#else
extern RETGETPAGESIZETYPE getpagesize (void);
#endif
#else
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#else
/* Not Unix, e.g. mingw32 */
#define PAGESIZE 4096
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#endif
/* Declare open(). */
#ifdef EXECUTABLE_VIA_MMAP_DEVZERO
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#ifdef OPEN_NEEDS_SYS_FILE_H
#include <sys/file.h>
#endif
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#endif
/* Declare open(). */
#ifdef EXECUTABLE_VIA_MMAP_DEVZERO
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#endif
/* Declare shmget(), shmat(), shmctl(). */
#ifdef EXECUTABLE_VIA_SHM
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
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#endif
#endif
#endif
#ifdef __m88k__
#include <sys/syslocal.h>
#endif
/* Inline assembly function for instruction cache flush. */
#if defined(__sparc__) || defined(__sparc64__) || defined(__alpha__) || defined(__hppaold__) || defined(__rs6000sysv4__) || defined(__rs6000netbsd__) || defined(__convex__)
#ifdef __GNUC__
extern inline
#if defined(__sparc__) || defined(__sparc64__)
#include "cache-sparc.c"
#endif
#ifdef __alpha__
#include "cache-alpha.c"
#endif
#ifdef __hppa__
#include "cache-hppa.c"
#endif
#ifdef __rs6000__
#include "cache-rs6000.c"
#endif
#ifdef __convex__
#include "cache-convex.c"
#endif
#else
#if defined(__sparc__) || defined(__sparc64__)
extern void __TR_clear_cache_4();
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#endif
#endif
#endif
#ifdef __m88k__
#include <sys/syslocal.h>
#endif
/* Inline assembly function for instruction cache flush. */
#if defined(__sparc__) || defined(__sparc64__) || defined(__alpha__) || defined(__hppaold__) || defined(__powerpcsysv4__) || defined(__convex__)
#ifdef __GNUC__
extern inline
#if defined(__sparc__) || defined(__sparc64__)
#include "cache-sparc.c"
#endif
#ifdef __alpha__
#include "cache-alpha.c"
#endif
#ifdef __hppa__
#include "cache-hppa.c"
#endif
#if defined(__powerpc__) && !defined(__powerpc64__)
#include "cache-powerpc.c"
#endif
#ifdef __convex__
#include "cache-convex.c"
#endif
#else
#if defined(__sparc__) || defined(__sparc64__)
extern void __TR_clear_cache_4();
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#define TRAMP_LENGTH 16
#define TRAMP_ALIGN 16 /* 4 for a i386, 16 for a i486 */
#endif
#ifdef __m68k__
#define TRAMP_LENGTH 14
#define TRAMP_ALIGN 16
#endif
#if defined(__mips__) && !defined(__mipsn32__)
#define TRAMP_LENGTH 24
#define TRAMP_ALIGN 4
#endif
#ifdef __mipsn32__
#define TRAMP_LENGTH 24
#define TRAMP_ALIGN 4
#endif
#ifdef __mips64old__
#define TRAMP_LENGTH 56
#define TRAMP_ALIGN 4
#endif
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#define TRAMP_LENGTH 16
#define TRAMP_ALIGN 16 /* 4 for a i386, 16 for a i486 */
#endif
#ifdef __m68k__
#define TRAMP_LENGTH 14
#define TRAMP_ALIGN 16
#endif
#if defined(__mips__) || defined(__mipsn32__) && !defined(__mips64__)
#define TRAMP_LENGTH 24
#define TRAMP_ALIGN 4
#endif
#ifdef __mips64old__
#define TRAMP_LENGTH 56
#define TRAMP_ALIGN 4
#endif
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#endif
#ifdef __hppanew__
#define TRAMP_LENGTH 16
#define TRAMP_ALIGN 16
#define TRAMP_BIAS 2
#endif
#ifdef __arm__
#define TRAMP_LENGTH 32
#define TRAMP_ALIGN 4
#endif
#ifdef __rs6000sysv4__
#define TRAMP_LENGTH 24
#define TRAMP_ALIGN 4
#endif
#ifdef __rs6000netbsd__
#define TRAMP_LENGTH 24
#define TRAMP_ALIGN 4
#endif
#ifdef __rs6000aix__
#define TRAMP_LENGTH 20
#define TRAMP_ALIGN 4
#endif
#ifdef __m88k__
#define TRAMP_LENGTH 20
#define TRAMP_ALIGN 8
#endif
#ifdef __convex__
#define TRAMP_LENGTH 14
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#endif
#ifdef __hppanew__
#define TRAMP_LENGTH 16
#define TRAMP_ALIGN 16
#define TRAMP_BIAS 2
#endif
#ifdef __arm__
#define TRAMP_LENGTH 16
#define TRAMP_ALIGN 4
#endif
#ifdef __powerpcsysv4__
#define TRAMP_LENGTH 24
#define TRAMP_ALIGN 4
#endif
#ifdef __powerpcaix__
#define TRAMP_LENGTH 20
#define TRAMP_ALIGN 4
#endif
#ifdef __powerpc64aix__
#define TRAMP_LENGTH 40
#define TRAMP_ALIGN 8
#endif
#ifdef __m88k__
#define TRAMP_LENGTH 20
#define TRAMP_ALIGN 8
#endif
#ifdef __convex__
#define TRAMP_LENGTH 14
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/* AIX doesn't support mprotect() in malloc'ed memory. Must get pages of
* memory with execute permission via mmap(). Then keep a free list of
* free trampolines.
*/
static char* freelist = NULL;
#endif
#if defined(__STDC__) || defined(__GNUC__) || defined(__cplusplus)
#else
__TR_function alloc_trampoline_r (address, data0, data1)
__TR_function address;
void* data0;
void* data1;
#endif
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/* AIX doesn't support mprotect() in malloc'ed memory. Must get pages of
* memory with execute permission via mmap(). Then keep a free list of
* free trampolines.
*/
static char* freelist = NULL;
#endif
__TR_function alloc_trampoline_r (__TR_function address, void* data0, void* data1)
{
char* function;
char* data;
#if !defined(CODE_EXECUTABLE)
static long pagesize = 0;
#if defined(EXECUTABLE_VIA_MMAP_DEVZERO)
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/* 1. Allocate room */
#if !defined(CODE_EXECUTABLE) && !defined(EXECUTABLE_VIA_MPROTECT)
/* Note: This memory allocation is not multithread-safe. We might need
* to add special (platform dependent) code for locking.
* Fortunately, most modern systems where multithread-safety matters
* have EXECUTABLE_VIA_MPROTECT, and those which don't (AIX on rs6000 and
* HP-UX on hppa) have CODE_EXECUTABLE. Thus no locking code is needed
* for the moment.
*/
if (freelist == NULL)
{ /* Get a new page. */
char* page;
#ifdef EXECUTABLE_VIA_MMAP_ANONYMOUS
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/* 1. Allocate room */
#if !defined(CODE_EXECUTABLE) && !defined(EXECUTABLE_VIA_MPROTECT)
/* Note: This memory allocation is not multithread-safe. We might need
* to add special (platform dependent) code for locking.
* Fortunately, most modern systems where multithread-safety matters
* have EXECUTABLE_VIA_MPROTECT, and those which don't (AIX on powerpc and
* HP-UX on hppa) have CODE_EXECUTABLE. Thus no locking code is needed
* for the moment.
*/
if (freelist == NULL)
{ /* Get a new page. */
char* page;
#ifdef EXECUTABLE_VIA_MMAP_ANONYMOUS
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*(unsigned short *) (function + 6) == 0xE951
#define tramp_address(function) \
*(long *) (function + 8) + (long) (function + 12)
#define tramp_data(function) \
*(long *) (function + 2)
#endif
#ifdef __m68k__
/* function:
* movel #<data>,a0 20 7C <data>
* jmp <address> 4E F9 <address>
* nop 4E 71
*/
*(short *) (function + 0) = 0x207C;
*(long *) (function + 2) = (long) data;
*(short *) (function + 6) = 0x4EF9;
*(long *) (function + 8) = (long) address;
*(short *) (function +12) = 0x4E71;
#define is_tramp(function) \
*(unsigned short *) (function + 0) == 0x207C && \
*(unsigned short *) (function + 6) == 0x4EF9 && \
*(unsigned short *) (function +12) == 0x4E71
#define tramp_address(function) \
*(long *) (function + 8)
#define tramp_data(function) \
*(long *) (function + 2)
#endif
#if defined(__mips__) && !defined(__mipsn32__)
/* function:
* li $2,<data>&0xffff0000 3C 02 hi16(<data>)
* ori $2,$2,<data>&0xffff 34 42 lo16(<data>)
* li $25,<address>&0xffff0000 3C 19 hi16(<address>)
* ori $25,$25,<address>&0xffff 37 39 lo16(<address>)
* j $25 03 20 00 08
* nop 00 00 00 00
*/
/* What about big endian / little endian ?? */
*(short *) (function + 0) = 0x3C02;
*(short *) (function + 2) = (unsigned long) data >> 16;
*(short *) (function + 4) = 0x3442;
*(short *) (function + 6) = (unsigned long) data & 0xffff;
*(short *) (function + 8) = 0x3C19;
*(short *) (function +10) = (unsigned long) address >> 16;
*(short *) (function +12) = 0x3739;
*(short *) (function +14) = (unsigned long) address & 0xffff;
*(long *) (function +16) = 0x03200008;
*(long *) (function +20) = 0x00000000;
#define is_tramp(function) \
*(unsigned short *) (function + 0) == 0x3C02 && \
*(unsigned short *) (function + 4) == 0x3442 && \
*(unsigned short *) (function + 8) == 0x3C19 && \
*(unsigned short *) (function +12) == 0x3739 && \
*(unsigned long *) (function +16) == 0x03200008 && \
*(unsigned long *) (function +20) == 0x00000000
#define hilo(hiword,loword) \
(((unsigned long) (hiword) << 16) | (unsigned long) (loword))
#define tramp_address(function) \
hilo(*(unsigned short *) (function +10), *(unsigned short *) (function +14))
#define tramp_data(function) \
hilo(*(unsigned short *) (function + 2), *(unsigned short *) (function + 6))
#endif
#ifdef __mipsn32__
/* function:
* lw $2,16($25) 8F 22 00 10
* lw $25,20($25) 8F 39 00 14
* j $25 03 20 00 08
* nop 00 00 00 00
* .word <data> <data>
* .word <address> <address>
*/
/* What about big endian / little endian ?? */
*(int *) (function + 0) == 0x8F220010 && \
*(int *) (function + 4) == 0x8F390014 && \
*(int *) (function + 8) == 0x03200008 && \
*(int *) (function +12) == 0x00000000
#define tramp_address(function) \
*(unsigned int *) (function +20)
#define tramp_data(function) \
*(unsigned int *) (function +16)
#endif
#ifdef __mips64old__
/* function:
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*(unsigned short *) (function + 6) == 0xE951
#define tramp_address(function) \
*(long *) (function + 8) + (long) (function + 12)
#define tramp_data(function) \
*(long *) (function + 2)
#endif
#ifdef __m68k__
#ifdef __NetBSD__
/* function:
* movel #<data>,a1 22 7C <data>
* jmp <address> 4E F9 <address>
* nop 4E 71
*/
*(short *) (function + 0) = 0x227C;
*(long *) (function + 2) = (long) data;
*(short *) (function + 6) = 0x4EF9;
*(long *) (function + 8) = (long) address;
*(short *) (function +12) = 0x4E71;
#define is_tramp(function) \
*(unsigned short *) (function + 0) == 0x227C && \
*(unsigned short *) (function + 6) == 0x4EF9 && \
*(unsigned short *) (function +12) == 0x4E71
#else
/* function:
* movel #<data>,a0 20 7C <data>
* jmp <address> 4E F9 <address>
* nop 4E 71
*/
*(short *) (function + 0) = 0x207C;
*(long *) (function + 2) = (long) data;
*(short *) (function + 6) = 0x4EF9;
*(long *) (function + 8) = (long) address;
*(short *) (function +12) = 0x4E71;
#define is_tramp(function) \
*(unsigned short *) (function + 0) == 0x207C && \
*(unsigned short *) (function + 6) == 0x4EF9 && \
*(unsigned short *) (function +12) == 0x4E71
#endif
#define tramp_address(function) \
*(long *) (function + 8)
#define tramp_data(function) \
*(long *) (function + 2)
#endif
#if defined(__mips__) || defined(__mipsn32__) && !defined(__mips64__)
/* function:
* lw $2,16($25) 8F 22 00 10
* lw $25,20($25) 8F 39 00 14
* j $25 03 20 00 08
* nop 00 00 00 00
* .word <data> <data>
* .word <address> <address>
*/
*(unsigned int *) (function + 0) = 0x8F220010;
*(unsigned int *) (function + 4) = 0x8F390014;
*(unsigned int *) (function + 8) = 0x03200008;
*(unsigned int *) (function +12) = 0x00000000;
*(unsigned int *) (function +16) = (unsigned int) data;
*(unsigned int *) (function +20) = (unsigned int) address;
#define is_tramp(function) \
*(unsigned int *) (function + 0) == 0x8F220010 && \
*(unsigned int *) (function + 4) == 0x8F390014 && \
*(unsigned int *) (function + 8) == 0x03200008 && \
*(unsigned int *) (function +12) == 0x00000000
#define tramp_address(function) \
*(unsigned int *) (function +20)
#define tramp_data(function) \
*(unsigned int *) (function +16)
#endif
#ifdef __mips64old__
/* function:
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* ld $2,16($25) DF 22 00 10
* ld $25,24($25) DF 39 00 18
* j $25 03 20 00 08
* nop 00 00 00 00
* .dword <data> <data>
* .dword <address> <address>
*/
/* What about big endian / little endian ?? */
*(long *) (function + 0) = 0xDF220010DF390018L;
*(long *) (function + 8) = 0x0320000800000000L;
*(unsigned long *) (function +16) = (unsigned long) data;
*(unsigned long *) (function +24) = (unsigned long) address;
#define is_tramp(function) \
*(long *) (function + 0) == 0xDF220010DF390018L && \
*(long *) (function + 8) == 0x0320000800000000L
#define tramp_address(function) \
*(unsigned long *) (function +24)
#define tramp_data(function) \
*(unsigned long *) (function +16)
#endif
#if defined(__sparc__) && !defined(__sparc64__)
/* function:
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* ld $2,16($25) DF 22 00 10
* ld $25,24($25) DF 39 00 18
* j $25 03 20 00 08
* nop 00 00 00 00
* .dword <data> <data>
* .dword <address> <address>
*/
*(unsigned int *) (function + 0) = 0xDF220010;
*(unsigned int *) (function + 4) = 0xDF390018;
*(unsigned int *) (function + 8) = 0x03200008;
*(unsigned int *) (function +12) = 0x00000000;
*(unsigned long *) (function +16) = (unsigned long) data;
*(unsigned long *) (function +24) = (unsigned long) address;
#define is_tramp(function) \
*(unsigned int *) (function + 0) == 0xDF220010 && \
*(unsigned int *) (function + 4) == 0xDF390018 && \
*(unsigned int *) (function + 8) == 0x03200008 && \
*(unsigned int *) (function +12) == 0x00000000
#define tramp_address(function) \
*(unsigned long *) (function +24)
#define tramp_data(function) \
*(unsigned long *) (function +16)
#endif
#if defined(__sparc__) && !defined(__sparc64__)
/* function:
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#define tramp_address(function) \
((long *) function)[3]
#define tramp_data(function) \
((long *) function)[2]
#endif
#ifdef __arm__
/* function:
* ldr ip,[pc,#_function-.-8] E59FC014
* ldr ip,[ip,#0] E59CC000 ??Is this correct??
* stmfd sp!,{ip} E92D1000
* ldr ip,[pc,#_data-.-8] E59FC004
* ldr ip,[ip,#0] E59CC000 ??Is this correct??
* ldmfd sp!,{pc}^ E8FD8000
* .word <data> <data>
* _function:
* .word <address> <address>
*/
{ static long code [6] =
{ 0xE59FC014, 0xE59CC000, 0xE92D1000, 0xE59FC004,
0xE59CC000, 0xE8FD8000
};
int i;
for (i=0; i<6; i++) { ((long *) function)[i] = code[i]; }
((long *) function)[6] = (long) data;
((long *) function)[7] = (long) address;
}
#define is_tramp(function) \
((long *) function)[0] == 0xE59FC014 && \
((long *) function)[1] == 0xE59CC000 && \
((long *) function)[2] == 0xE92D1000 && \
((long *) function)[3] == 0xE59FC004 && \
((long *) function)[4] == 0xE59CC000 && \
((long *) function)[5] == 0xE8FD8000
#define tramp_address(function) \
((long *) function)[7]
#define tramp_data(function) \
((long *) function)[6]
#endif
#ifdef __rs6000sysv4__
/* function:
* {liu|lis} 11,hi16(<data>) 3D 60 hi16(<data>)
* {oril|ori} 11,11,lo16(<data>) 61 6B lo16(<data>)
* {liu|lis} 0,hi16(<address>) 3C 00 hi16(<address>)
* {oril|ori} 0,0,lo16(<address>) 60 00 lo16(<address>)
* mtctr 0 7C 09 03 A6
* bctr 4E 80 04 20
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#define tramp_address(function) \
((long *) function)[3]
#define tramp_data(function) \
((long *) function)[2]
#endif
#ifdef __arm__
/* function:
* add r12,pc,#8 E28FC008
* ldr pc,[pc] E59FF000
* _data:
* .word <data>
* _function:
* .word <address>
*/
{
((long *) function)[0] = 0xE28FC008;
((long *) function)[1] = 0xE59FF000;
((long *) function)[2] = (long) data;
((long *) function)[3] = (long) address;
}
#define is_tramp(function) \
((long *) function)[0] == 0xE28FC008 && \
((long *) function)[1] == 0xE59FF000
#define tramp_address(function) \
((long *) function)[3]
#define tramp_data(function) \
((long *) function)[2]
#endif
#ifdef __powerpcsysv4__
#ifdef __NetBSD__
/* function:
* {liu|lis} 13,hi16(<data>) 3D A0 hi16(<data>)
* {oril|ori} 13,13,lo16(<data>) 61 AD lo16(<data>)
* {liu|lis} 0,hi16(<address>) 3C 00 hi16(<address>)
* {oril|ori} 0,0,lo16(<address>) 60 00 lo16(<address>)
* mtctr 0 7C 09 03 A6
* bctr 4E 80 04 20
*/
*(short *) (function + 0) = 0x3DA0;
*(short *) (function + 2) = (unsigned long) data >> 16;
*(short *) (function + 4) = 0x61AD;
*(short *) (function + 6) = (unsigned long) data & 0xffff;
*(short *) (function + 8) = 0x3C00;
*(short *) (function +10) = (unsigned long) address >> 16;
*(short *) (function +12) = 0x6000;
*(short *) (function +14) = (unsigned long) address & 0xffff;
*(long *) (function +16) = 0x7C0903A6;
*(long *) (function +20) = 0x4E800420;
#define is_tramp(function) \
*(unsigned short *) (function + 0) == 0x3DA0 && \
*(unsigned short *) (function + 4) == 0x61AD && \
*(unsigned short *) (function + 8) == 0x3C00 && \
*(unsigned short *) (function +12) == 0x6000 && \
*(unsigned long *) (function +16) == 0x7C0903A6 && \
*(unsigned long *) (function +20) == 0x4E800420
#else
/* function:
* {liu|lis} 11,hi16(<data>) 3D 60 hi16(<data>)
* {oril|ori} 11,11,lo16(<data>) 61 6B lo16(<data>)
* {liu|lis} 0,hi16(<address>) 3C 00 hi16(<address>)
* {oril|ori} 0,0,lo16(<address>) 60 00 lo16(<address>)
* mtctr 0 7C 09 03 A6
* bctr 4E 80 04 20
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#define is_tramp(function) \
*(unsigned short *) (function + 0) == 0x3D60 && \
*(unsigned short *) (function + 4) == 0x616B && \
*(unsigned short *) (function + 8) == 0x3C00 && \
*(unsigned short *) (function +12) == 0x6000 && \
*(unsigned long *) (function +16) == 0x7C0903A6 && \
*(unsigned long *) (function +20) == 0x4E800420
#define hilo(hiword,loword) \
(((unsigned long) (hiword) << 16) | (unsigned long) (loword))
#define tramp_address(function) \
hilo(*(unsigned short *) (function +10), *(unsigned short *) (function +14))
#define tramp_data(function) \
hilo(*(unsigned short *) (function + 2), *(unsigned short *) (function + 6))
#endif
#ifdef __rs6000netbsd__
/* function:
* {liu|lis} 13,hi16(<data>) 3D A0 hi16(<data>)
* {oril|ori} 13,13,lo16(<data>) 61 AD lo16(<data>)
* {liu|lis} 0,hi16(<address>) 3C 00 hi16(<address>)
* {oril|ori} 0,0,lo16(<address>) 60 00 lo16(<address>)
* mtctr 0 7C 09 03 A6
* bctr 4E 80 04 20
*/
*(short *) (function + 0) = 0x3DA0;
*(short *) (function + 2) = (unsigned long) data >> 16;
*(short *) (function + 4) = 0x61AD;
*(short *) (function + 6) = (unsigned long) data & 0xffff;
*(short *) (function + 8) = 0x3C00;
*(short *) (function +10) = (unsigned long) address >> 16;
*(short *) (function +12) = 0x6000;
*(short *) (function +14) = (unsigned long) address & 0xffff;
*(long *) (function +16) = 0x7C0903A6;
*(long *) (function +20) = 0x4E800420;
#define is_tramp(function) \
*(unsigned short *) (function + 0) == 0x3DA0 && \
*(unsigned short *) (function + 4) == 0x61AD && \
*(unsigned short *) (function + 8) == 0x3C00 && \
*(unsigned short *) (function +12) == 0x6000 && \
*(unsigned long *) (function +16) == 0x7C0903A6 && \
*(unsigned long *) (function +20) == 0x4E800420
#define hilo(hiword,loword) \
(((unsigned long) (hiword) << 16) | (unsigned long) (loword))
#define tramp_address(function) \
hilo(*(unsigned short *) (function +10), *(unsigned short *) (function +14))
#define tramp_data(function) \
hilo(*(unsigned short *) (function + 2), *(unsigned short *) (function + 6))
#endif
#ifdef __rs6000aix__
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#define is_tramp(function) \
*(unsigned short *) (function + 0) == 0x3D60 && \
*(unsigned short *) (function + 4) == 0x616B && \
*(unsigned short *) (function + 8) == 0x3C00 && \
*(unsigned short *) (function +12) == 0x6000 && \
*(unsigned long *) (function +16) == 0x7C0903A6 && \
*(unsigned long *) (function +20) == 0x4E800420
#endif
#define hilo(hiword,loword) \
(((unsigned long) (hiword) << 16) | (unsigned long) (loword))
#define tramp_address(function) \
hilo(*(unsigned short *) (function +10), *(unsigned short *) (function +14))
#define tramp_data(function) \
hilo(*(unsigned short *) (function + 2), *(unsigned short *) (function + 6))
#endif
#ifdef __powerpcaix__
/* function:
* .long .tramp_r
* .long .mytoc
* .long 0
* .mytoc:
* .long <data>
* .long <address>
*/
*(long *) (function + 0) = ((long *) &tramp_r)[0];
*(long *) (function + 4) = (long) (function + 12);
*(long *) (function + 8) = 0;
*(long *) (function +12) = (long) data;
*(long *) (function +16) = (long) address;
#define is_tramp(function) \
((long *) function)[0] == ((long *) &tramp_r)[0]
#define tramp_address(function) \
((long *) function)[4]
#define tramp_data(function) \
((long *) function)[3]
#endif
#ifdef __powerpc64aix__
/* function:
* .quad .tramp_r
* .quad .mytoc
* .quad 0
* .mytoc:
* .quad <data>
* .quad <address>
*/
*(long *) (function + 0) = ((long *) &tramp_r)[0];
*(long *) (function + 8) = (long) (function + 24);
*(long *) (function +16) = 0;
*(long *) (function +24) = (long) data;
*(long *) (function +32) = (long) address;
#define is_tramp(function) \
((long *) function)[0] == ((long *) &tramp_r)[0]
#define tramp_address(function) \
((long *) function)[4]
#define tramp_data(function) \
((long *) function)[3]
#endif
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#endif
/* 4. Flush instruction cache */
/* We need this because some CPUs have separate data cache and instruction
* cache. The freshly built trampoline is visible to the data cache, but not
* maybe not to the instruction cache. This is hairy.
*/
#if !(defined(__hppanew__) || defined(__rs6000aix__) || defined(__ia64__))
/* Only needed if we really set up machine instructions. */
#ifdef __i386__
#if defined(_WIN32)
while (!FlushInstructionCache(GetCurrentProcess(),function,TRAMP_LENGTH))
continue;
#endif
#endif
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#endif
/* 4. Flush instruction cache */
/* We need this because some CPUs have separate data cache and instruction
* cache. The freshly built trampoline is visible to the data cache, but not
* maybe not to the instruction cache. This is hairy.
*/
#if !(defined(__hppanew__) || defined(__powerpcaix__) || defined(__powerpc64aix__) || defined(__ia64__))
/* Only needed if we really set up machine instructions. */
#ifdef __i386__
#if defined(_WIN32)
while (!FlushInstructionCache(GetCurrentProcess(),function,TRAMP_LENGTH))
continue;
#endif
#endif
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__TR_clear_cache();
#endif
#ifdef __hppa__
/* This assumes that the trampoline fits in at most two cache lines. */
__TR_clear_cache(function,function+TRAMP_LENGTH-1);
#endif
#ifdef __arm__
/* This CPU does not have a separate instruction cache. (I think.) */
#endif
#ifdef __rs6000__
__TR_clear_cache(function);
#endif
#ifdef __m88k__
sysmot(S88CACHEFLUSHPAGE, (unsigned long)function & -pagesize);
#endif
#ifdef __convex__
__TR_clear_cache();
#endif
#endif
/* 5. Return. */
return (__TR_function) (function + TRAMP_BIAS);
}
#if defined(__STDC__) || defined(__GNUC__) || defined(__cplusplus)
#else
void free_trampoline_r (function)
__TR_function function;
#endif
#if defined(__STDC__) || defined(__GNUC__) || defined(__cplusplus)
#else
int is_trampoline_r (function)
void* function;
#endif
#if defined(__STDC__) || defined(__GNUC__) || defined(__cplusplus)
#else
__TR_function trampoline_r_address (function)
void* function;
#endif
#if defined(__STDC__) || defined(__GNUC__) || defined(__cplusplus)
#else
void* trampoline_r_data0 (function)
void* function;
#endif
#if defined(__STDC__) || defined(__GNUC__) || defined(__cplusplus)
#else
void* trampoline_r_data1 (function)
void* function;
#endif
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__TR_clear_cache();
#endif
#ifdef __hppa__
/* This assumes that the trampoline fits in at most two cache lines. */
__TR_clear_cache(function,function+TRAMP_LENGTH-1);
#endif
#ifdef __arm__
__TR_clear_cache(function,function+TRAMP_LENGTH);
#endif
#if defined(__powerpc__) && !defined(__powerpc64__)
__TR_clear_cache(function);
#endif
#ifdef __m88k__
sysmot(S88CACHEFLUSHPAGE, (unsigned long)function & -pagesize);
#endif
#ifdef __convex__
__TR_clear_cache();
#endif
#endif
/* 5. Return. */
return (__TR_function) (function + TRAMP_BIAS);
}
void free_trampoline_r (__TR_function function)
{
#if TRAMP_BIAS
function = (__TR_function)((char*)function - TRAMP_BIAS);
#endif
#if !defined(CODE_EXECUTABLE) && !defined(EXECUTABLE_VIA_MPROTECT)
*(char**)function = freelist; freelist = (char*)function;
/* It is probably not worth calling munmap() for entirely freed pages. */
#else
free(((char**)function)[-1]);
#endif
}
int is_trampoline_r (void* function)
{
#if defined(is_tramp) && defined(tramp_data)
#ifdef __hppanew__
void* tramp_r_address = &tramp_r;
if (!(((long)function & 3) == (TRAMP_BIAS & 3))) return 0;
#endif
return
((is_tramp(((char*)function - TRAMP_BIAS)))
&& ((tramp_data(((char*)function - TRAMP_BIAS))) == (long)((char*)function - TRAMP_BIAS + TRAMP_LENGTH))
? 1 : 0
);
#else
abort();
#endif
}
__TR_function trampoline_r_address (void* function)
{
#ifdef tramp_address
return (__TR_function)(tramp_address(((char*)function - TRAMP_BIAS)));
#else
abort();
#endif
}
void* trampoline_r_data0 (void* function)
{
#ifdef tramp_data
return ((void**)((char*)function-TRAMP_BIAS+TRAMP_LENGTH))[0];
#else
abort();
#endif
}
void* trampoline_r_data1 (void* function)
{
#ifdef tramp_data
return ((void**)((char*)function-TRAMP_BIAS+TRAMP_LENGTH))[1];
#else
abort();
#endif
}
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