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/* Trampoline construction */

/*
 * Copyright 1995-1999, 2001-2004 Bruno Haible, <bruno@clisp.org>
 * 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.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(__powerpc__) && !defined(__powerpc64__)
#if !defined(_AIX)
#define __rs6000sysv4__  /* SysV.4 ABI, real machine code. */
#define __powerpcsysv4__  /* SysV.4 ABI, real machine code. */
#else
#define __rs6000aix__  /* AIX ABI, just a closure. */
#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 (); /* 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__)
#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) (); /* 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);
#else
extern RETGETPAGESIZETYPE getpagesize ();
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
#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(__convex__)
#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
#ifdef __rs6000__
#include "cache-rs6000.c"
#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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#endif
#ifdef __hppanew__
#define TRAMP_LENGTH 20
#define TRAMP_ALIGN 16
#define TRAMP_BIAS 2
#endif
#ifdef __arm__
#define TRAMP_LENGTH 44
#define TRAMP_LENGTH 36
#define TRAMP_ALIGN 4
#endif
#ifdef __rs6000sysv4__
#ifdef __powerpcsysv4__
#define TRAMP_LENGTH 36
#define TRAMP_ALIGN 4
#endif
#ifdef __rs6000aix__
#ifdef __powerpcaix__
#define TRAMP_LENGTH 24
#define TRAMP_ALIGN 4
#endif
#ifdef __powerpc64aix__
#define TRAMP_LENGTH 48
#define TRAMP_ALIGN 8
#endif
#ifdef __m88k__
#define TRAMP_LENGTH 32
#define TRAMP_ALIGN 8
#endif
#ifdef __convex__
#define TRAMP_LENGTH 20
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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)
__TR_function alloc_trampoline (__TR_function address, void* variable, void* data)
#else
__TR_function alloc_trampoline (address, variable, data)
  __TR_function address;
  void* variable;
  void* data;
#endif
{
  char* function;

#if !defined(CODE_EXECUTABLE)
  static long pagesize = 0;
#if defined(EXECUTABLE_VIA_MMAP_DEVZERO)
  static int zero_fd;
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#define tramp_variable(function)  \
  ((long *) function)[2]
#define tramp_data(function)  \
  ((long *) function)[3]
#endif
#ifdef __arm__
  /* function:
   *    stmfd   sp!,{r0}			E92D0001
   *    ldr     r0,[pc,#_data-.-8]		E59F0014
   *	stmfd	sp!,{r0}		E92D0001
   * 	ldr	r0,[pc,#16]		E59F000C
   *    ldr     ip,[r0,#0]			E590C000
   *    ldr     r0,[pc,#_variable-.-8]		E59F0010
   *    str     ip,[r0,#0]			E580C000
   *    ldmfd   sp!,{r0}^			E8FD0001
   *    ldr     ip,[pc,#_function-.-8]		E59FC008
   *	ldr	ip,[pc,#16]		E59FC00C
   *	str	r0,[ip]			E58C0000
   *	ldmfd	sp!,{r0}		E8BD0001
   *	ldr	pc,[pc,#4]		E59FF004
   *    ldr     pc,[ip,#0]			E59CF000
   * _data:
   *    .word   <data>				<data>
   *	.word	<data>
   * _variable:
   *    .word   <variable>			<variable>
   *	.word	<variable>
   * _function:
   *    .word   <address>			<address>
   *	.word	<address>
   */
  {
  { static long code [8] =
      { 0xE92D0001, 0xE59F0014, 0xE590C000, 0xE59F0010,
        0xE580C000, 0xE8FD0001, 0xE59FC008, 0xE59CF000
    ((long *) function)[0] = 0xE92D0001;
    ((long *) function)[1] = 0xE59F000C;
    ((long *) function)[2] = 0xE59FC00C;
      };
    int i;
    for (i=0; i<8; i++) { ((long *) function)[i] = code[i]; }
    ((long *) function)[8] = (long) data;
    ((long *) function)[9] = (long) variable;
    ((long *) function)[10] = (long) address;
    ((long *) function)[3] = 0xE58C0000;
    ((long *) function)[4] = 0xE8BD0001;
    ((long *) function)[5] = 0xE59FF004;
    ((long *) function)[6] = (long)data;
    ((long *) function)[7] = (long)variable;
    ((long *) function)[8] = (long)address;
  }
#define is_tramp(function)  \
  ((long *) function)[0] == 0xE92D0001 && \
  ((long *) function)[1] == 0xE59F0014 && \
  ((long *) function)[2] == 0xE590C000 && \
  ((long *) function)[3] == 0xE59F0010 && \
  ((long *) function)[4] == 0xE580C000 && \
  ((long *) function)[5] == 0xE8FD0001 && \
    ((long *) function)[0] == 0xE92D0001 && \
    ((long *) function)[1] == 0xE59F000C && \
    ((long *) function)[2] == 0xE59FC00C && \
    ((long *) function)[3] == 0xE58C0000 && \
    ((long *) function)[4] == 0xE8BD0001 && \
    ((long *) function)[5] == 0xE59FF004
  ((long *) function)[6] == 0xE59FC008 && \
  ((long *) function)[7] == 0xE59CF000
#define tramp_address(function)  \
  ((long *) function)[10]
  ((long *) function)[8]
#define tramp_variable(function)  \
  ((long *) function)[9]
  ((long *) function)[7]
#define tramp_data(function)  \
  ((long *) function)[8]
  ((long *) function)[6]
#endif
#ifdef __rs6000sysv4__
#ifdef __powerpcsysv4__
  /* function:
   *    {liu|lis} 11,hi16(<variable>)		3D 60 hi16(<variable>)
   *    {oril|ori} 11,11,lo16(<variable>)	61 6B lo16(<variable>)
   *    {liu|lis} 12,hi16(<data>)		3D 80 hi16(<data>)
   *    {oril|ori} 12,12,lo16(<data>)		61 8C lo16(<data>)
   *    {st|stw} 12,0(11)			91 8B 00 00
   *    {liu|lis} 0,hi16(<address>)		3C 00 hi16(<address>)
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#define tramp_address(function)  \
  hilo(*(unsigned short *) (function +22), *(unsigned short *) (function +26))
#define tramp_variable(function)  \
  hilo(*(unsigned short *) (function + 2), *(unsigned short *) (function + 6))
#define tramp_data(function)  \
  hilo(*(unsigned short *) (function +10), *(unsigned short *) (function +14))
#endif
#ifdef __rs6000aix__
#ifdef __powerpcaix__
  /* function:
   *    .long .tramp
   *    .long .mytoc
   *    .long 0
   * .mytoc:
   *    .long <variable>
   *    .long <data>
   *    .long <address>
   */
  *(long *)  (function + 0) = ((long *) &tramp)[0];
  *(long *)  (function + 4) = (long) (function + 12);
  *(long *)  (function + 8) = 0;
  *(long *)  (function +12) = (long) variable;
  *(long *)  (function +16) = (long) data;
  *(long *)  (function +20) = (long) address;
#define is_tramp(function)  \
  ((long *) function)[0] == ((long *) &tramp)[0]
#define tramp_address(function)  \
  ((long *) function)[5]
#define tramp_variable(function)  \
  ((long *) function)[3]
#define tramp_data(function)  \
  ((long *) function)[4]
#endif
#ifdef __powerpc64aix__
  /* function:
   *    .quad .tramp
   *    .quad .mytoc
   *    .quad 0
   * .mytoc:
   *    .quad <variable>
   *    .quad <data>
   *    .quad <address>
   */
  *(long *)  (function + 0) = ((long *) &tramp)[0];
  *(long *)  (function + 8) = (long) (function + 24);
  *(long *)  (function +16) = 0;
  *(long *)  (function +24) = (long) variable;
  *(long *)  (function +32) = (long) data;
  *(long *)  (function +40) = (long) address;
#define is_tramp(function)  \
  ((long *) function)[0] == ((long *) &tramp)[0]
#define tramp_address(function)  \
  ((long *) function)[5]
#define tramp_variable(function)  \
  ((long *) function)[3]
#define tramp_data(function)  \
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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__))
#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.) */
  __TR_clear_cache(function,function+TRAMP_LENGTH);
#endif
#ifdef __rs6000__
#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);
}

#if defined(__STDC__) || defined(__GNUC__) || defined(__cplusplus)
void free_trampoline (__TR_function function)
#else
void free_trampoline (function)
  __TR_function function;
#endif
{
#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
}

#if defined(__STDC__) || defined(__GNUC__) || defined(__cplusplus)
int is_trampoline (void* function)
#else
int is_trampoline (function)
  void* function;
#endif
{
#ifdef is_tramp
#ifdef __hppanew__
  void* tramp_address = &tramp;
  if (!(((long)function & 3) == (TRAMP_BIAS & 3))) return 0;
#endif
  return ((is_tramp(((char*)function - TRAMP_BIAS))) ? 1 : 0);
#else
  abort();
#endif
}

#if defined(__STDC__) || defined(__GNUC__) || defined(__cplusplus)
__TR_function trampoline_address (void* function)
#else
__TR_function trampoline_address (function)
  void* function;
#endif
{
#ifdef tramp_address
  return (__TR_function)(tramp_address(((char*)function - TRAMP_BIAS)));
#else
  abort();
#endif
}

#if defined(__STDC__) || defined(__GNUC__) || defined(__cplusplus)
void* trampoline_variable (void* function)
#else
void* trampoline_variable (function)
  void* function;
#endif
{
#ifdef tramp_variable
  return (void*)(tramp_variable(((char*)function - TRAMP_BIAS)));
#else
  abort();
#endif
}

#if defined(__STDC__) || defined(__GNUC__) || defined(__cplusplus)
void* trampoline_data (void* function)
#else
void* trampoline_data (function)
  void* function;
#endif
{
#ifdef tramp_data
  return (void*)(tramp_data(((char*)function - TRAMP_BIAS)));
#else
  abort();
#endif
}