md.h

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#elif defined(__mips__)
#define MD_STACK_GROWS_DOWN

#define MD_INIT_CONTEXT(_thread, _sp, _main)               \
  ST_BEGIN_MACRO                                           \
  MD_SETJMP((_thread)->context);                           \
  _thread->context[0].__jmpbuf[0].__pc = (__ptr_t) _main;  \
  _thread->context[0].__jmpbuf[0].__sp = _sp;              \
  ST_END_MACRO

#else /* Not IA-64 or mips */

/*
 * On linux, there are a few styles of jmpbuf format.  These vary based
 * on architecture/glibc combination.
 *
 * Most of the glibc based toggles were lifted from:
 * mozilla/nsprpub/pr/include/md/_linux.h
 */

/*
 * Starting with glibc 2.4, JB_SP definitions are not public anymore.
 * They, however, can still be found in glibc source tree in
 * architecture-specific "jmpbuf-offsets.h" files.
 * Most importantly, the content of jmp_buf is mangled by setjmp to make
 * it completely opaque (the mangling can be disabled by setting the
 * LD_POINTER_GUARD environment variable before application execution).
 * Therefore we will use built-in _st_md_cxt_save/_st_md_cxt_restore
 * functions as a setjmp/longjmp replacement wherever they are available
 * unless USE_LIBC_SETJMP is defined.
 */

#if defined(__powerpc__)
#define MD_STACK_GROWS_DOWN

#if (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1)
#ifndef JB_GPR1
#define JB_GPR1 0
#endif
#define MD_GET_SP(_t) (_t)->context[0].__jmpbuf[JB_GPR1]   
#else
/* not an error but certainly cause for caution */
#error "Untested use of old glibc on powerpc"
#define MD_GET_SP(_t) (_t)->context[0].__jmpbuf[0].__misc[0]
#endif /* glibc 2.1 or later */

#elif defined(__alpha)
#define MD_STACK_GROWS_DOWN

#if defined(__GLIBC__) && __GLIBC__ >= 2
#ifndef JB_SP
#define JB_SP 8
#endif
#define MD_GET_SP(_t) (_t)->context[0].__jmpbuf[JB_SP]
#else
/* not an error but certainly cause for caution */
#error "Untested use of old glibc on alpha"
#define MD_GET_SP(_t) (_t)->context[0].__jmpbuf[0].__sp
#endif

#elif defined(__mc68000__)
#define MD_STACK_GROWS_DOWN

/* m68k still uses old style sigjmp_buf */
#define MD_GET_SP(_t) (_t)->context[0].__jmpbuf[0].__sp

#elif defined(__sparc__)
#define MD_STACK_GROWS_DOWN

#if defined(__GLIBC__) && __GLIBC__ >= 2
#ifndef JB_SP
#define JB_SP 0
#endif
#define MD_GET_SP(_t) (_t)->context[0].__jmpbuf[JB_SP]
#else
/* not an error but certainly cause for caution */
#error "Untested use of old glic on sparc -- also using odd mozilla derived __fp"
#define MD_GET_SP(_t) (_t)->context[0].__jmpbuf[0].__fp
#endif

#elif defined(__i386__)
#define MD_STACK_GROWS_DOWN
#define MD_USE_BUILTIN_SETJMP

#if defined(__GLIBC__) && __GLIBC__ >= 2
#ifndef JB_SP
#define JB_SP 4
#endif
#define MD_GET_SP(_t) (_t)->context[0].__jmpbuf[JB_SP]
#else
/* not an error but certainly cause for caution */
#error "Untested use of old glibc on i386"
#define MD_GET_SP(_t) (_t)->context[0].__jmpbuf[0].__sp
#endif

#elif defined(__amd64__) || defined(__x86_64__)
#define MD_STACK_GROWS_DOWN
#define MD_USE_BUILTIN_SETJMP

#ifndef JB_RSP
#define JB_RSP 6
#endif
#define MD_GET_SP(_t) (_t)->context[0].__jmpbuf[JB_RSP]

#elif defined(__arm__)
#define MD_STACK_GROWS_DOWN

#if defined(__GLIBC__) && __GLIBC__ >= 2
#define MD_GET_SP(_t) (_t)->context[0].__jmpbuf[20]
#else
#error "ARM/Linux pre-glibc2 not supported yet"
#endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */

#elif defined(__s390__)
#define MD_STACK_GROWS_DOWN

/* There is no JB_SP in glibc at this time. (glibc 2.2.5)
 */
#define MD_GET_SP(_t) (_t)->context[0].__jmpbuf[0].__gregs[9]

#elif defined(__hppa__)
#define MD_STACK_GROWS_UP

/* yes, this is gross, unfortunately at the moment (2002/08/01) there is
 * a bug in hppa's glibc header definition for JB_SP, so we can't
 * use that...
 */
#define MD_GET_SP(_t) (*(long *)(((char *)&(_t)->context[0].__jmpbuf[0]) + 76))

#else
#error "Unknown CPU architecture"
#endif /* Cases with common MD_INIT_CONTEXT and different SP locations */

#define MD_INIT_CONTEXT(_thread, _sp, _main) \
  ST_BEGIN_MACRO                             \
  if (MD_SETJMP((_thread)->context))         \
    _main();                                 \
  MD_GET_SP(_thread) = (long) (_sp);         \
  ST_END_MACRO

#endif /* Cases with different MD_INIT_CONTEXT */

#if defined(MD_USE_BUILTIN_SETJMP) && !defined(USE_LIBC_SETJMP)
#define MD_SETJMP(env) _st_md_cxt_save(env)
#define MD_LONGJMP(env, val) _st_md_cxt_restore(env, val)

extern int _st_md_cxt_save(jmp_buf env);
extern void _st_md_cxt_restore(jmp_buf env, int val);
#else
#define MD_SETJMP(env) setjmp(env)
#define MD_LONGJMP(env, val) longjmp(env, val)
#endif

#elif defined (NETBSD)

#define MD_STACK_GROWS_DOWN
#define MD_USE_BSD_ANON_MMAP
#define MD_ACCEPT_NB_INHERITED
#define MD_ALWAYS_UNSERIALIZED_ACCEPT
#define MD_HAVE_SOCKLEN_T

#define MD_SETJMP(env) _setjmp(env)
#define MD_LONGJMP(env, val) _longjmp(env, val)

#if defined(__i386__)
#define MD_JB_SP   2
#elif defined(__alpha__)
#define MD_JB_SP  34
#elif defined(__sparc__)
#define MD_JB_SP   0
#elif defined(__vax__)
#define MD_JB_SP   2
#else
#error Unknown CPU architecture
#endif

#define MD_INIT_CONTEXT(_thread, _sp, _main)   \
  ST_BEGIN_MACRO                               \
  if (MD_SETJMP((_thread)->context))           \
    _main();                                   \
  (_thread)->context[MD_JB_SP] = (long) (_sp); \
  ST_END_MACRO

#define MD_GET_UTIME()            \
  struct timeval tv;              \
  (void) gettimeofday(&tv, NULL); \
  return (tv.tv_sec * 1000000LL + tv.tv_usec)

#elif defined (OPENBSD)

#define MD_STACK_GROWS_DOWN
#define MD_USE_BSD_ANON_MMAP
#define MD_ACCEPT_NB_INHERITED
#define MD_ALWAYS_UNSERIALIZED_ACCEPT

#define MD_SETJMP(env) _setjmp(env)
#define MD_LONGJMP(env, val) _longjmp(env, val)

#if defined(__i386__)
#define MD_JB_SP   2
#elif defined(__alpha__)
#define MD_JB_SP  34
#elif defined(__sparc__)
#define MD_JB_SP   0
#elif defined(__amd64__)
#define MD_JB_SP   6
#else
#error Unknown CPU architecture
#endif

#define MD_INIT_CONTEXT(_thread, _sp, _main)   \
  ST_BEGIN_MACRO                               \
  if (MD_SETJMP((_thread)->context))           \
    _main();                                   \
  (_thread)->context[MD_JB_SP] = (long) (_sp); \
  ST_END_MACRO

#define MD_GET_UTIME()            \
  struct timeval tv;              \
  (void) gettimeofday(&tv, NULL); \
  return (tv.tv_sec * 1000000LL + tv.tv_usec)

#elif defined (OSF1)

#include <signal.h>

#define MD_STACK_GROWS_DOWN
#define MD_USE_SYSV_ANON_MMAP
#define MD_ACCEPT_NB_NOT_INHERITED
#define MD_ALWAYS_UNSERIALIZED_ACCEPT

#define MD_SETJMP(env) _setjmp(env)
#define MD_LONGJMP(env, val) _longjmp(env, val)

#define MD_INIT_CONTEXT(_thread, _sp, _main)                         \
  ST_BEGIN_MACRO                                                     \
  if (MD_SETJMP((_thread)->context))                                 \
    _main();                                                         \
  ((struct sigcontext *)((_thread)->context))->sc_sp = (long) (_sp); \
  ST_END_MACRO

#define MD_GET_UTIME()            \
  struct timeval tv;              \
  (void) gettimeofday(&tv, NULL); \
  return (tv.tv_sec * 1000000LL + tv.tv_usec)

#elif defined (SOLARIS)

#include <sys/filio.h>
extern int getpagesize(void);

#define MD_STACK_GROWS_DOWN
#define MD_USE_SYSV_ANON_MMAP
#define MD_ACCEPT_NB_NOT_INHERITED

#define MD_SETJMP(env) setjmp(env)
#define MD_LONGJMP(env, val) longjmp(env, val)

#if defined(sparc) || defined(__sparc)
#ifdef _LP64
#define MD_STACK_PAD_SIZE 4095
#endif
#define MD_INIT_CONTEXT(_thread, _sp, _main) \
  ST_BEGIN_MACRO                             \
  (void) MD_SETJMP((_thread)->context);      \
  (_thread)->context[1] = (long) (_sp);      \
  (_thread)->context[2] = (long) _main;      \
  ST_END_MACRO
#elif defined(i386) || defined(__i386)
#define MD_INIT_CONTEXT(_thread, _sp, _main) \
  ST_BEGIN_MACRO                             \
  (void) MD_SETJMP((_thread)->context);      \
  (_thread)->context[4] = (long) (_sp);      \
  (_thread)->context[5] = (long) _main;      \
  ST_END_MACRO
#elif defined(__amd64__)
#define MD_INIT_CONTEXT(_thread, _sp, _main)   \
  ST_BEGIN_MACRO                               \
  if (MD_SETJMP((_thread)->context))           \
    _main();                                   \
  (_thread)->context[6] = (long) (_sp); \
  ST_END_MACRO
#else
#error Unknown CPU architecture
#endif

#define MD_GET_UTIME() \
  return (gethrtime() / 1000)

#else
#error Unknown OS
#endif /* OS */

#if !defined(MD_HAVE_POLL) && !defined(MD_DONT_HAVE_POLL)
#define MD_HAVE_POLL
#endif

#ifndef MD_STACK_PAD_SIZE
#define MD_STACK_PAD_SIZE 128
#endif

#if !defined(MD_HAVE_SOCKLEN_T) && !defined(socklen_t)
#define socklen_t int
#endif

#ifndef MD_CAP_STACK
#define MD_CAP_STACK(var_addr)
#endif

#endif /* !__ST_MD_H__ */