1 # This file is from Google Performance Tools, svn revision r226.
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34 # Original file follows below.
36 # We want to access the "PC" (Program Counter) register from a struct
37 # ucontext. Every system has its own way of doing that. We try all the
38 # possibilities we know about. Note REG_PC should come first (REG_RIP
39 # is also defined on solaris, but does the wrong thing).
41 # OpenBSD doesn't have ucontext.h, but we can get PC from ucontext_t
44 # The first argument of AC_PC_FROM_UCONTEXT will be invoked when we
45 # cannot find a way to obtain PC from ucontext.
47 AC_DEFUN([AC_PC_FROM_UCONTEXT],
48 [AC_CHECK_HEADERS(ucontext.h)
49 # Redhat 7 has <sys/ucontext.h>, but it barfs if we #include it directly
50 # (this was fixed in later redhats). <ucontext.h> works fine, so use that.
51 if grep "Red Hat Linux release 7" /etc/redhat-release >/dev/null 2>&1; then
52 AC_DEFINE(HAVE_SYS_UCONTEXT_H, 0, [<sys/ucontext.h> is broken on redhat 7])
53 ac_cv_header_sys_ucontext_h=no
55 AC_CHECK_HEADERS(sys/ucontext.h) # ucontext on OS X 10.6 (at least)
57 AC_CHECK_HEADERS(cygwin/signal.h) # ucontext on cywgin
58 AC_MSG_CHECKING([how to access the program counter from a struct ucontext])
59 pc_fields=" uc_mcontext.gregs[[REG_PC]]" # Solaris x86 (32 + 64 bit)
60 pc_fields="$pc_fields uc_mcontext.gregs[[REG_EIP]]" # Linux (i386)
61 pc_fields="$pc_fields uc_mcontext.gregs[[REG_RIP]]" # Linux (x86_64)
62 pc_fields="$pc_fields uc_mcontext.sc_ip" # Linux (ia64)
63 pc_fields="$pc_fields uc_mcontext.uc_regs->gregs[[PT_NIP]]" # Linux (ppc)
64 pc_fields="$pc_fields uc_mcontext.gregs[[R15]]" # Linux (arm old [untested])
65 pc_fields="$pc_fields uc_mcontext.arm_pc" # Linux (arm arch 5)
66 pc_fields="$pc_fields uc_mcontext.gp_regs[[PT_NIP]]" # Suse SLES 11 (ppc64)
67 pc_fields="$pc_fields uc_mcontext.mc_eip" # FreeBSD (i386)
68 pc_fields="$pc_fields uc_mcontext.mc_rip" # FreeBSD (x86_64 [untested])
69 pc_fields="$pc_fields uc_mcontext.__gregs[[_REG_EIP]]" # NetBSD (i386)
70 pc_fields="$pc_fields uc_mcontext.__gregs[[_REG_RIP]]" # NetBSD (x86_64)
71 pc_fields="$pc_fields uc_mcontext->ss.eip" # OS X (i386, <=10.4)
72 pc_fields="$pc_fields uc_mcontext->__ss.__eip" # OS X (i386, >=10.5)
73 pc_fields="$pc_fields uc_mcontext->ss.rip" # OS X (x86_64)
74 pc_fields="$pc_fields uc_mcontext->__ss.__rip" # OS X (>=10.5 [untested])
75 pc_fields="$pc_fields uc_mcontext->ss.srr0" # OS X (ppc, ppc64 [untested])
76 pc_fields="$pc_fields uc_mcontext->__ss.__srr0" # OS X (>=10.5 [untested])
78 for pc_field in $pc_fields; do
79 if ! $pc_field_found; then
80 # Prefer sys/ucontext.h to ucontext.h, for OS X's sake.
81 if test "x$ac_cv_header_cygwin_signal_h" = xyes; then
82 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <cygwin/signal.h>]],
83 [[ucontext_t u; return u.$pc_field == 0;]])],
84 AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
85 How to access the PC from a struct ucontext)
86 AC_MSG_RESULT([$pc_field])
88 elif test "x$ac_cv_header_sys_ucontext_h" = xyes; then
89 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/ucontext.h>]],
90 [[ucontext_t u; return u.$pc_field == 0;]])],
91 AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
92 How to access the PC from a struct ucontext)
93 AC_MSG_RESULT([$pc_field])
95 elif test "x$ac_cv_header_ucontext_h" = xyes; then
96 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <ucontext.h>]],
97 [[ucontext_t u; return u.$pc_field == 0;]])],
98 AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
99 How to access the PC from a struct ucontext)
100 AC_MSG_RESULT([$pc_field])
102 else # hope some standard header gives it to us
103 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]],
104 [[ucontext_t u; return u.$pc_field == 0;]])],
105 AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
106 How to access the PC from a struct ucontext)
107 AC_MSG_RESULT([$pc_field])
112 if ! $pc_field_found; then
113 pc_fields=" sc_eip" # OpenBSD (i386)
114 pc_fields="$pc_fields sc_rip" # OpenBSD (x86_64)
115 for pc_field in $pc_fields; do
116 if ! $pc_field_found; then
117 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <signal.h>]],
118 [[ucontext_t u; return u.$pc_field == 0;]])],
119 AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
120 How to access the PC from a struct ucontext)
121 AC_MSG_RESULT([$pc_field])
126 if ! $pc_field_found; then