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97 lines
5.1 KiB
97 lines
5.1 KiB
4 years ago
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# We want to access the "PC" (Program Counter) register from a struct
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# ucontext. Every system has its own way of doing that. We try all the
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# possibilities we know about. Note REG_PC should come first (REG_RIP
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# is also defined on solaris, but does the wrong thing).
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# OpenBSD doesn't have ucontext.h, but we can get PC from ucontext_t
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# by using signal.h.
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# The first argument of AC_PC_FROM_UCONTEXT will be invoked when we
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# cannot find a way to obtain PC from ucontext.
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AC_DEFUN([AC_PC_FROM_UCONTEXT],
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[AC_CHECK_HEADERS(ucontext.h)
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# Redhat 7 has <sys/ucontext.h>, but it barfs if we #include it directly
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# (this was fixed in later redhats). <ucontext.h> works fine, so use that.
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if grep "Red Hat Linux release 7" /etc/redhat-release >/dev/null 2>&1; then
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AC_DEFINE(HAVE_SYS_UCONTEXT_H, 0, [<sys/ucontext.h> is broken on redhat 7])
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ac_cv_header_sys_ucontext_h=no
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else
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AC_CHECK_HEADERS(sys/ucontext.h) # ucontext on OS X 10.6 (at least)
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fi
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AC_CHECK_HEADERS(cygwin/signal.h) # ucontext on cywgin
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AC_MSG_CHECKING([how to access the program counter from a struct ucontext])
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pc_fields=" uc_mcontext.gregs[[REG_PC]]" # Solaris x86 (32 + 64 bit)
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pc_fields="$pc_fields uc_mcontext.gregs[[REG_EIP]]" # Linux (i386)
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pc_fields="$pc_fields uc_mcontext.gregs[[REG_RIP]]" # Linux (x86_64)
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pc_fields="$pc_fields uc_mcontext.sc_ip" # Linux (ia64)
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pc_fields="$pc_fields uc_mcontext.uc_regs->gregs[[PT_NIP]]" # Linux (ppc)
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pc_fields="$pc_fields uc_mcontext.gregs[[R15]]" # Linux (arm old [untested])
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pc_fields="$pc_fields uc_mcontext.arm_pc" # Linux (arm arch 5)
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pc_fields="$pc_fields uc_mcontext.gp_regs[[PT_NIP]]" # Suse SLES 11 (ppc64)
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pc_fields="$pc_fields uc_mcontext.mc_eip" # FreeBSD (i386)
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pc_fields="$pc_fields uc_mcontext.mc_rip" # FreeBSD (x86_64 [untested])
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pc_fields="$pc_fields uc_mcontext.__gregs[[_REG_EIP]]" # NetBSD (i386)
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pc_fields="$pc_fields uc_mcontext.__gregs[[_REG_RIP]]" # NetBSD (x86_64)
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pc_fields="$pc_fields uc_mcontext->ss.eip" # OS X (i386, <=10.4)
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pc_fields="$pc_fields uc_mcontext->__ss.__eip" # OS X (i386, >=10.5)
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pc_fields="$pc_fields uc_mcontext->ss.rip" # OS X (x86_64)
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pc_fields="$pc_fields uc_mcontext->__ss.__rip" # OS X (>=10.5 [untested])
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pc_fields="$pc_fields uc_mcontext->ss.srr0" # OS X (ppc, ppc64 [untested])
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pc_fields="$pc_fields uc_mcontext->__ss.__srr0" # OS X (>=10.5 [untested])
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pc_field_found=false
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for pc_field in $pc_fields; do
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if ! $pc_field_found; then
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# Prefer sys/ucontext.h to ucontext.h, for OS X's sake.
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if test "x$ac_cv_header_cygwin_signal_h" = xyes; then
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AC_TRY_COMPILE([#define _GNU_SOURCE 1
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#include <cygwin/signal.h>],
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[ucontext_t u; return u.$pc_field == 0;],
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AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
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How to access the PC from a struct ucontext)
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AC_MSG_RESULT([$pc_field])
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pc_field_found=true)
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elif test "x$ac_cv_header_sys_ucontext_h" = xyes; then
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AC_TRY_COMPILE([#define _GNU_SOURCE 1
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#include <sys/ucontext.h>],
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[ucontext_t u; return u.$pc_field == 0;],
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AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
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How to access the PC from a struct ucontext)
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AC_MSG_RESULT([$pc_field])
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pc_field_found=true)
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elif test "x$ac_cv_header_ucontext_h" = xyes; then
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AC_TRY_COMPILE([#define _GNU_SOURCE 1
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#include <ucontext.h>],
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[ucontext_t u; return u.$pc_field == 0;],
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AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
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How to access the PC from a struct ucontext)
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AC_MSG_RESULT([$pc_field])
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pc_field_found=true)
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else # hope some standard header gives it to us
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AC_TRY_COMPILE([],
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[ucontext_t u; return u.$pc_field == 0;],
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AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
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How to access the PC from a struct ucontext)
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AC_MSG_RESULT([$pc_field])
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pc_field_found=true)
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fi
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fi
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done
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if ! $pc_field_found; then
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pc_fields=" sc_eip" # OpenBSD (i386)
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pc_fields="$pc_fields sc_rip" # OpenBSD (x86_64)
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for pc_field in $pc_fields; do
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if ! $pc_field_found; then
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AC_TRY_COMPILE([#include <signal.h>],
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[ucontext_t u; return u.$pc_field == 0;],
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AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
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How to access the PC from a struct ucontext)
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AC_MSG_RESULT([$pc_field])
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pc_field_found=true)
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fi
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done
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fi
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if ! $pc_field_found; then
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[$1]
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fi])
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