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Include asm/ptrace.h when accessing ucontext_t

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In some architectures (e.g. powerpc, powerpc64 and powerpc64le), the
macro that specifies the position of the program counter is defined in
header asm/ptrace.h.

When glibc bug 21457 got fixed in version 2.27, header sys/ucontext.h
stopped including signal.h, which indirectly removed asm/ptrace.h too.

Signed-off-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
This commit is contained in:
Tulio Magno Quites Machado Filho 2019-02-08 10:33:09 -02:00 committed by Aliaksey Kandratsenka
parent 5574c87e39
commit fc00474ddc
2 changed files with 14 additions and 1 deletions
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12
m4/pc_from_ucontext.m4
View File

@ -20,6 +20,7 @@ AC_DEFUN([AC_PC_FROM_UCONTEXT],
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="$pc_fields uc_mcontext.gregs[[REG_EIP]]" # Linux (i386)
@ -53,9 +54,18 @@ AC_DEFUN([AC_PC_FROM_UCONTEXT],
How to access the PC from a struct ucontext)
AC_MSG_RESULT([$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_TRY_COMPILE([#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$ac_cv_header_sys_ucontext_h" = xyes; then
AC_TRY_COMPILE([#define _GNU_SOURCE 1
#include <sys/ucontext.h>],
#include <sys/ucontext.h>],
[ucontext_t u; return u.$pc_field == 0;],
AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
How to access the PC from a struct ucontext)

3
src/getpc.h
View File

@ -56,6 +56,9 @@
//#define _XOPEN_SOURCE 500
#include <string.h> // for memcmp
#ifdef HAVE_ASM_PTRACE_H
#include <asm/ptrace.h>
#endif
#if defined(HAVE_SYS_UCONTEXT_H)
#include <sys/ucontext.h>
#elif defined(HAVE_UCONTEXT_H)