| # 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) |
| # Redhat 7 has <sys/ucontext.h>, but it barfs if we #include it directly |
| # (this was fixed in later redhats). <ucontext.h> works fine, so use that. |
| if grep "Red Hat Linux release 7" /etc/redhat-release >/dev/null 2>&1; then |
| AC_DEFINE(HAVE_SYS_UCONTEXT_H, 0, [<sys/ucontext.h> is broken on redhat 7]) |
| ac_cv_header_sys_ucontext_h=no |
| else |
| AC_CHECK_HEADERS(sys/ucontext.h) # ucontext on OS X 10.6 (at least) |
| fi |
| AC_CHECK_HEADERS(cygwin/signal.h) # ucontext on cywgin |
| AC_CHECK_HEADERS(asm/ptrace.h) # get ptrace macros, e.g. PT_NIP |
| 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.__pc" # Linux (loongarch64) |
| pc_fields="$pc_fields uc_mcontext.pc" # Linux (mips) |
| pc_fields="$pc_fields uc_mcontext.uc_regs->gregs[[PT_NIP]]" # Linux (ppc) |
| pc_fields="$pc_fields uc_mcontext.__gregs[[REG_PC]]" # Linux (riscv64) |
| pc_fields="$pc_fields uc_mcontext.psw.addr" # Linux (s390) |
| pc_fields="$pc_fields uc_mcontext.gregs[[R15]]" # Linux (arm old [untested]) |
| pc_fields="$pc_fields uc_mcontext.arm_pc" # Linux (arm arch 5) |
| pc_fields="$pc_fields uc_mcontext.gp_regs[[PT_NIP]]" # Suse SLES 11 (ppc64) |
| pc_fields="$pc_fields uc_mcontext.mc_eip" # FreeBSD (i386) |
| pc_fields="$pc_fields uc_mcontext.mc_srr0" # FreeBSD (powerpc, powerpc64) |
| pc_fields="$pc_fields uc_mcontext.mc_rip" # FreeBSD (x86_64) |
| 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_fields="$pc_fields uc_mcontext->__ss.__pc" # OS X (arm64) |
| pc_field_found=false |
| for pc_field in $pc_fields; do |
| if ! $pc_field_found; then |
| # Prefer sys/ucontext.h to ucontext.h, for OS X's sake. |
| if test "x$ac_cv_header_cygwin_signal_h" = xyes; then |
| AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#define _GNU_SOURCE 1 |
| #include <cygwin/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],[]) |
| elif test "x$ac_cv_header_asm_ptrace_h" = xyes -a "x$ac_cv_header_sys_ucontext_h" = xyes; then |
| AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#define _GNU_SOURCE 1 |
| #include <asm/ptrace.h> |
| #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],[]) |
| elif test "x$ac_cv_header_sys_ucontext_h" = xyes; then |
| AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#define _GNU_SOURCE 1 |
| #include <sys/ucontext.h>]], [[ucontext_t u; return u.$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],[]) |
| elif test "x$ac_cv_header_ucontext_h" = xyes; then |
| AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#define _GNU_SOURCE 1 |
| #include <ucontext.h>]], [[ucontext_t u; return u.$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],[]) |
| else # hope some standard header gives it to us |
| AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[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 ! $pc_field_found; then |
| AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <signal.h>]], [[ucontext_t u; return u.$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]) |
