71 lines
3.6 KiB
Text
71 lines
3.6 KiB
Text
# We want to access the "PC" (Program Counter) register from a struct
|
|
# ucontext. Every system has its own way of doing that. We try all the
|
|
# possibilities we know about. Note REG_PC should come first (REG_RIP
|
|
# is also defined on solaris, but does the wrong thing).
|
|
|
|
# OpenBSD doesn't have ucontext.h, but we can get PC from ucontext_t
|
|
# by using signal.h.
|
|
|
|
# The first argument of AC_PC_FROM_UCONTEXT will be invoked when we
|
|
# cannot find a way to obtain PC from ucontext.
|
|
|
|
AC_DEFUN([AC_PC_FROM_UCONTEXT],
|
|
[AC_CHECK_HEADERS(ucontext.h)
|
|
AC_CHECK_HEADERS(sys/ucontext.h) # ucontext on OS X 10.6 (at least)
|
|
AC_MSG_CHECKING([how to access the program counter from a struct ucontext])
|
|
pc_fields=" uc_mcontext.gregs[[REG_PC]]" # Solaris x86 (32 + 64 bit)
|
|
pc_fields="$pc_fields uc_mcontext.gregs[[REG_EIP]]" # Linux (i386)
|
|
pc_fields="$pc_fields uc_mcontext.gregs[[REG_RIP]]" # Linux (x86_64)
|
|
pc_fields="$pc_fields uc_mcontext.sc_ip" # Linux (ia64)
|
|
pc_fields="$pc_fields uc_mcontext.uc_regs->gregs[[PT_NIP]]" # Linux (ppc)
|
|
pc_fields="$pc_fields uc_mcontext.gregs[[R15]]" # Linux (arm old [untested])
|
|
pc_fields="$pc_fields uc_mcontext.arm_pc" # Linux (arm new [untested])
|
|
pc_fields="$pc_fields uc_mcontext.mc_eip" # FreeBSD (i386)
|
|
pc_fields="$pc_fields uc_mcontext.mc_rip" # FreeBSD (x86_64 [untested])
|
|
pc_fields="$pc_fields uc_mcontext.__gregs[[_REG_EIP]]" # NetBSD (i386)
|
|
pc_fields="$pc_fields uc_mcontext.__gregs[[_REG_RIP]]" # NetBSD (x86_64)
|
|
pc_fields="$pc_fields uc_mcontext->ss.eip" # OS X (i386, <=10.4)
|
|
pc_fields="$pc_fields uc_mcontext->__ss.__eip" # OS X (i386, >=10.5)
|
|
pc_fields="$pc_fields uc_mcontext->ss.rip" # OS X (x86_64)
|
|
pc_fields="$pc_fields uc_mcontext->__ss.__rip" # OS X (>=10.5 [untested])
|
|
pc_fields="$pc_fields uc_mcontext->ss.srr0" # OS X (ppc, ppc64 [untested])
|
|
pc_fields="$pc_fields uc_mcontext->__ss.__srr0" # OS X (>=10.5 [untested])
|
|
pc_field_found=false
|
|
for pc_field in $pc_fields; do
|
|
if ! $pc_field_found; then
|
|
if test "x$ac_cv_header_sys_ucontext_h" = xyes; then
|
|
AC_TRY_COMPILE([#define _GNU_SOURCE 1
|
|
#include <sys/ucontext.h>],
|
|
[ucontext_t u; return u.$pc_field == 0;],
|
|
AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
|
|
How to access the PC from a struct ucontext)
|
|
AC_MSG_RESULT([$pc_field])
|
|
pc_field_found=true)
|
|
else
|
|
AC_TRY_COMPILE([#define _GNU_SOURCE 1
|
|
#include <ucontext.h>],
|
|
[ucontext_t u; return u.$pc_field == 0;],
|
|
AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
|
|
How to access the PC from a struct ucontext)
|
|
AC_MSG_RESULT([$pc_field])
|
|
pc_field_found=true)
|
|
fi
|
|
fi
|
|
done
|
|
if ! $pc_field_found; then
|
|
pc_fields=" sc_eip" # OpenBSD (i386)
|
|
pc_fields="$pc_fields sc_rip" # OpenBSD (x86_64)
|
|
for pc_field in $pc_fields; do
|
|
if ! $pc_field_found; then
|
|
AC_TRY_COMPILE([#include <signal.h>],
|
|
[ucontext_t u; return u.$pc_field == 0;],
|
|
AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
|
|
How to access the PC from a struct ucontext)
|
|
AC_MSG_RESULT([$pc_field])
|
|
pc_field_found=true)
|
|
fi
|
|
done
|
|
fi
|
|
if ! $pc_field_found; then
|
|
[$1]
|
|
fi])
|