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emacs/exec/configure.ac
Po Lu ebf5bcb9f0 Optimize process execution on Android 
* exec/configure.ac (REENTRANT): Remove option for reentrancy.
(PROGRAM_COUNTER, HAVE_SECCOMP): Define register providing the
program counter and enable seccomp if its headers are available.

* exec/exec.c (write_load_command): Avoid defining unused
variable.
(exec_0): Remove code specific to REENTRANT configurations.

* exec/exec.h (struct exec_tracee) <exec_data, data_size>: New
fields for loader instructions and their size.

* exec/exec1.c (main): Call exec_init before forking.

* exec/mipsel-user.h (ELF_NGREG): Delete definition.
(struct mipsel_regs): Reduce number of gregs to 32, but
introduce separate fields for special registers.

* exec/trace.c (use_seccomp_p): New variable; defile to false if
!HAVE_SECCOMP.
(remove_tracee): Cease providing for non-reentrant
configurations.  Release executable data if present.
(handle_clone_prepare): Likewise.  Resume process with
PTRACE_CONT if seccomp-based interception is enabled.
(handle_clone, check_signal): Resume processes as above.
(handle_exec): Divide into two functions, with only rewriting
the system call and generating instructions for the loader
remaining in the first, and copying such instructions into the
loader's stack removed into a new function, `finish_exec'.
(finish_exec): New function.
(handle_readlinkat, handle_openat): Abolish non-REENTRANT
configurations.
(process_system_call): Divide exec system calls into two phases,
disambiguated by the value of tracee->waiting_for_syscall.  Typo
fixes.  Accommodate syscall-exit-stops where the signal was
initially intercepted by `seccomp_system_call'.
(interesting_syscalls): New array.
(ARRAYELTS): New macro.
(seccomp_system_call, establish_seccomp_filter): New function.
(tracing_execve) [HAVE_SECCOMP]: Establish a seccomp filter if
this is to be enabled.
(after_fork): Provide PTRACE_O_TRACESECCOMP.  Resume process
with PTRACE_CONT if seccomp-based interception is enabled.
(exec_waitpid): Resume process with PTRACE_CONT if seccomp-based
interception is enabled.  Dispatch stops identifying as
PTRACE_EVENT_SECCOMP to `seccomp_system_call'.
(exec_init): Establish whether it is possible to enable seccomp.
2024-07-01 18:11:58 +08:00

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dnl Autoconf script for GNU Emacs's exec library.
dnl To rebuild the 'configure' script from this, execute the command
dnl autoconf
dnl in the directory containing this script.
dnl If you changed any AC_DEFINES, also run autoheader.
dnl
dnl Copyright (C) 2023-2024 Free Software Foundation, Inc.
dnl
dnl This file is part of GNU Emacs.
dnl
dnl GNU Emacs is free software: you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation, either version 3 of the License, or
dnl (at your option) any later version.
dnl
dnl GNU Emacs is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
dnl GNU General Public License for more details.
dnl
dnl You should have received a copy of the GNU General Public License
dnl along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
AC_PREREQ([2.65])
AC_INIT([libexec], [30.0.50], [bug-gnu-emacs@gnu.org], [],
[https://www.gnu.org/software/emacs/])
AH_TOP([/* Copyright (C) 2024 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
GNU Emacs is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */])
AC_USE_SYSTEM_EXTENSIONS
AC_PROG_CC
AC_PROG_CPP
AC_PROG_INSTALL
AC_TYPE_UINT8_T
AC_TYPE_UINT16_T
AC_TYPE_UINT32_T
AC_TYPE_UINT64_T
AC_TYPE_UINTPTR_T
AC_TYPE_SIZE_T
AC_TYPE_SSIZE_T
AC_TYPE_PID_T
AC_HEADER_STDBOOL
AC_CHECK_FUNCS([getpagesize stpcpy])
AC_CHECK_DECLS([stpcpy])
AC_CHECK_FUNC([process_vm_readv],
[AC_CHECK_FUNC([process_vm_writev],
[AC_CHECK_DECL([process_vm_readv],
[AC_DEFINE([HAVE_PROCESS_VM], [1],
[Define to 1 if process_vm_readv is available.])],
[], [[
#include <sys/uio.h>
]])])])
AC_CHECK_HEADERS([sys/param.h sys/uio.h])
AC_CHECK_MEMBERS([siginfo_t.si_syscall], [], [],
[[
#include <signal.h>
]])
AH_BOTTOM([
#ifdef HAVE_STDBOOL_H
# include <stdbool.h>
#else
# ifndef HAVE__BOOL
# ifdef __cplusplus
typedef bool _Bool;
# else
# define _Bool signed char
# endif
# endif
# define bool _Bool
# define false 0
# define true 1
# define __bool_true_false_are_defined 1
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif /* HAVE_SYS_PARAM_H */
#ifndef MAX
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif /* MAX */
#ifndef MIN
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif /* MIN */
])
AC_C_BIGENDIAN
AH_TEMPLATE([SYSCALL_HEADER], [Define to header holding system call numbers.])
AH_TEMPLATE([USER_HEADER], [Define to header holding USER_REGS_STRUCT.])
AH_TEMPLATE([USER_REGS_STRUCT], [Define to structure holding user registers.])
AH_TEMPLATE([SYSCALL_NUM_REG], [Define to register holding the system call number.])
AH_TEMPLATE([SYSCALL_ARG_REG], [Define to register holding arg0 to system calls.])
AH_TEMPLATE([SYSCALL_ARG1_REG], [Define to register holding arg1 to system calls.])
AH_TEMPLATE([SYSCALL_ARG2_REG], [Define to register holding arg2 to system calls.])
AH_TEMPLATE([SYSCALL_ARG3_REG], [Define to register holding arg3 to system calls.])
AH_TEMPLATE([SYSCALL_RET_REG], [Define to register holding value of system calls.])
AH_TEMPLATE([STACK_POINTER], [Define to register holding the stack pointer.])
AH_TEMPLATE([PROGRAM_COUNTER], [Define to register holding the program counter.])
AH_TEMPLATE([EXEC_SYSCALL], [Define to number of the `exec' system call.])
AH_TEMPLATE([USER_WORD], [Define to word type used by tracees.])
AH_TEMPLATE([USER_SWORD], [Define to signed word type used by tracees.])
AH_TEMPLATE([EXEC_64], [Define to 1 if the system utilizes 64-bit ELF.])
AH_TEMPLATE([STACK_GROWS_DOWNWARDS], [Define to 1 if the stack grows downwards.])
AH_TEMPLATE([ABI_RED_ZONE], [Define to number of reserved bytes past the stack frame.])
AH_TEMPLATE([EXECUTABLE_BASE], [Virtual address for loading PIC executables])
AH_TEMPLATE([INTERPRETER_BASE], [Virtual address for loading PIC interpreters])
AH_TEMPLATE([CLONE_SYSCALL], [Define to number of the `clone' system call.])
AH_TEMPLATE([CLONE3_SYSCALL], [Define to number of the `clone3' system call.])
AH_TEMPLATE([READLINK_SYSCALL], [Define to number of the `readlink' system call.])
AH_TEMPLATE([READLINKAT_SYSCALL], [Define to number of the `readlinkat' system call.])
AH_TEMPLATE([OPEN_SYSCALL], [Define to number of the `open' system call.])
AH_TEMPLATE([OPENAT_SYSCALL], [Define to number of the `openat' system call.])
AH_TEMPLATE([HAVE_SECCOMP], [Define to 1 if secure computing filters are available
to accelerate interception of system calls.])
AC_CANONICAL_HOST
# Check whether or not sys/user exists. If it doesn't, try
# asm/user.h, and croak if that doesn't exist either.
AS_CASE([$host], [*mips*], [], [*],
[AC_CHECK_HEADER([sys/user.h], [user_h="<sys/user.h>"],
[AC_CHECK_HEADER([asm/user.h], [user_h="<asm/user.h>"],
[AC_MSG_ERROR([Can not find working user.h])])])])
# Look for required tools.
AC_ARG_VAR([M4], [`m4' preprocessor command.])
AC_ARG_VAR([AS], [`as' assembler command.])
AC_ARG_VAR([LD], [`ld' linker command.])
# Check for a working m4.
AC_CHECK_PROGS([M4], [gm4 m4],
[AC_MSG_ERROR([Cannot find m4])])
# Check for a working assembler.
AC_CHECK_TOOL([AS], [as],
[AC_MSG_ERROR([Cannot find a working assembler])])
# And ar.
AC_CHECK_TOOL([AR], [ar],
[AC_MSG_ERROR([Cannot find a working ar])])
# And ld.
AC_CHECK_TOOL([LD], [ld],
[AC_MSG_ERROR([Cannot find a working linker])])
# Now check if ld is a C compiler.
LDPREFIX=
AC_CACHE_CHECK([whether ld is a C compiler],
[exec_cv_ld_is_cc],
[cat <<_ACEOF > conftest.c
AC_LANG_PROGRAM(,)
_ACEOF
exec_cv_ld_is_cc=yes
$LD -c conftest.c -o conftest.$OBJEXT >&AS_MESSAGE_LOG_FD 2>&1 \
|| exec_cv_ld_is_cc=no
rm -f conftest.c conftest.$OBJEXT])
# And if as is a C compiler.
AC_CACHE_CHECK([whether as is a C compiler],
[exec_cv_as_is_cc],
[cat <<_ACEOF > conftest.c
AC_LANG_PROGRAM(,)
_ACEOF
exec_cv_as_is_cc=yes
$AS -c conftest.c -o conftest.$OBJEXT >&AS_MESSAGE_LOG_FD 2>&1 \
|| exec_cv_as_is_cc=no
rm -f conftest.c conftest.$OBJEXT])
# If ld is a C compiler, pass `-nostdlib', `-nostartfiles', and
# `-static'. Also, set LDPREFIX to -Wl,
AS_IF([test "x$exec_cv_ld_is_cc" = "xyes"],
[LOADERFLAGS="$LOADERFLAGS -nostdlib -nostartfiles -static"
LDPREFIX=-Wl,])
# If as is a C compiler, add `-c' to ASFLAGS.
AS_IF([test "x$exec_cv_as_is_cc" = "xyes"],
[ASFLAGS="$ASFLAGS -c"])
AC_DEFUN([exec_CHECK_LINUX_CLONE3],
[
AC_CHECK_DECL([__NR_clone3],
[AC_DEFINE([CLONE3_SYSCALL], [__NR_clone3])],
[], [[
#include <asm/unistd.h>
]])
])
AC_DEFUN([exec_CHECK_MIPS_NABI],
[
AC_CACHE_CHECK([whether MIPS NABI calling convention is used],
[exec_cv_mips_nabi],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <sgidefs.h>
]], [[
#ifndef __mips64__
#if _MIPS_SIM == _ABIO32
OABI in use.
#endif /* _MIPS_SIM == _ABIO32 */
#endif /* !__mips64__ */
]])], [exec_cv_mips_nabi=yes],
[exec_cv_mips_nabi=no])])
dnl mips64 systems use N64 calling convention, a variant of nabi
dnl calling convention.
AS_IF([test "x$exec_cv_mips_nabi" != "xno"],
[AC_DEFINE([MIPS_NABI], [1],
[Define to 1 if MIPS NABI calling convention is being used.])],
[OBJS="$OBJS mipsfpu.o"])
])
# Determine the system type and define appropriate macros.
exec_loader=
is_mips=
OBJS="exec.o trace.o"
DADDI_BROKEN=no
AS_CASE([$host], [x86_64-*linux*],
[AC_CHECK_MEMBER([struct user_regs_struct.rdi],
[AC_DEFINE([SYSCALL_HEADER], [<asm/unistd.h>])
AC_DEFINE_UNQUOTED([USER_HEADER], [$user_h])
AC_DEFINE([USER_REGS_STRUCT], [struct user_regs_struct])
AC_DEFINE([SYSCALL_NUM_REG], [orig_rax])
AC_DEFINE([SYSCALL_RET_REG], [rax])
AC_DEFINE([SYSCALL_ARG_REG], [rdi])
AC_DEFINE([SYSCALL_ARG1_REG], [rsi])
AC_DEFINE([SYSCALL_ARG2_REG], [rdx])
AC_DEFINE([SYSCALL_ARG3_REG], [r10])
AC_DEFINE([STACK_POINTER], [rsp])
AC_DEFINE([PROGRAM_COUNTER], [rip])
AC_DEFINE([EXEC_SYSCALL], [__NR_execve])
AC_DEFINE([USER_WORD], [uintptr_t])
AC_DEFINE([USER_SWORD], [intptr_t])
AC_DEFINE([EXEC_64], [1])
AC_DEFINE([ABI_RED_ZONE], [128])
AC_DEFINE([EXECUTABLE_BASE], [0x555555554000])
AC_DEFINE([INTERPRETER_BASE], [0x600000000000])
AC_DEFINE([STACK_GROWS_DOWNWARDS], [1])
AC_DEFINE([CLONE_SYSCALL], [__NR_clone])
AC_DEFINE([READLINK_SYSCALL], [__NR_readlink])
AC_DEFINE([READLINKAT_SYSCALL], [__NR_readlinkat])
AC_DEFINE([OPEN_SYSCALL], [__NR_open])
AC_DEFINE([OPENAT_SYSCALL], [__NR_openat])
exec_CHECK_LINUX_CLONE3
# Make sure the loader doesn't conflict with other position
# dependent code.
LOADERFLAGS="$LOADERFLAGS $LDPREFIX-Ttext=0x200000000000"
exec_loader=loader-x86_64.s],
[AC_MSG_ERROR([Missing `rdi' in user_regs_struct])],
[[
#include $user_h
]])], [i[[34567]]86-*linux*],
[AC_CHECK_MEMBER([struct user_regs_struct.edi],
[AC_DEFINE([SYSCALL_HEADER], [<asm/unistd.h>])
AC_DEFINE_UNQUOTED([USER_HEADER], [$user_h])
AC_DEFINE([USER_REGS_STRUCT], [struct user_regs_struct])
AC_DEFINE([SYSCALL_NUM_REG], [orig_eax])
AC_DEFINE([SYSCALL_RET_REG], [eax])
AC_DEFINE([SYSCALL_ARG_REG], [ebx])
AC_DEFINE([SYSCALL_ARG1_REG], [ecx])
AC_DEFINE([SYSCALL_ARG2_REG], [edx])
AC_DEFINE([SYSCALL_ARG3_REG], [esi])
AC_DEFINE([STACK_POINTER], [esp])
AC_DEFINE([PROGRAM_COUNTER], [eip])
AC_DEFINE([EXEC_SYSCALL], [__NR_execve])
AC_DEFINE([USER_WORD], [uintptr_t])
AC_DEFINE([USER_SWORD], [intptr_t])
AC_DEFINE([EXECUTABLE_BASE], [0x0f000000])
AC_DEFINE([INTERPRETER_BASE], [0xaf000000])
AC_DEFINE([STACK_GROWS_DOWNWARDS], [1])
AC_DEFINE([CLONE_SYSCALL], [__NR_clone])
AC_DEFINE([READLINK_SYSCALL], [__NR_readlink])
AC_DEFINE([READLINKAT_SYSCALL], [__NR_readlinkat])
AC_DEFINE([OPEN_SYSCALL], [__NR_open])
AC_DEFINE([OPENAT_SYSCALL], [__NR_openat])
exec_CHECK_LINUX_CLONE3
# Make sure the loader doesn't conflict with other position
# dependent code.
LOADERFLAGS="$LOADERFLAGS $LDPREFIX-Ttext=0xa0000000"
exec_loader=loader-x86.s],
[AC_MSG_ERROR([Missing `edi' in user_regs_struct])],
[[
#include $user_h
]])], [aarch64-*linux*],
[AC_CHECK_MEMBER([struct user_regs_struct.sp],
[AC_DEFINE([SYSCALL_HEADER], [<asm/unistd.h>])
AC_DEFINE_UNQUOTED([USER_HEADER], [$user_h])
AC_DEFINE([USER_REGS_STRUCT], [struct user_regs_struct])
AC_DEFINE([SYSCALL_NUM_REG], [[regs[8]]])
AC_DEFINE([SYSCALL_RET_REG], [[regs[0]]])
AC_DEFINE([SYSCALL_ARG_REG], [[regs[0]]])
AC_DEFINE([SYSCALL_ARG1_REG], [[regs[1]]])
AC_DEFINE([SYSCALL_ARG2_REG], [[regs[2]]])
AC_DEFINE([SYSCALL_ARG3_REG], [[regs[3]]])
AC_DEFINE([STACK_POINTER], [sp])
AC_DEFINE([PROGRAM_COUNTER], [pc])
AC_DEFINE([EXEC_SYSCALL], [__NR_execve])
AC_DEFINE([USER_WORD], [uintptr_t])
AC_DEFINE([USER_SWORD], [intptr_t])
AC_DEFINE([EXEC_64], [1])
AC_DEFINE([EXECUTABLE_BASE], [0x3000000000])
AC_DEFINE([INTERPRETER_BASE], [0x3f00000000])
AC_DEFINE([STACK_GROWS_DOWNWARDS], [1])
AC_DEFINE([CLONE_SYSCALL], [__NR_clone])
# Note that aarch64 has neither `readlink' nor `open'.
AC_DEFINE([READLINKAT_SYSCALL], [__NR_readlinkat])
AC_DEFINE([OPENAT_SYSCALL], [__NR_openat])
exec_CHECK_LINUX_CLONE3
# Make sure the loader doesn't conflict with other position
# dependent code. ARM places rather significant restrictions on
# virtual addresses for a 64 bit architecture.
LOADERFLAGS="$LOADERFLAGS $LDPREFIX-Ttext=0x2000000000"
exec_loader=loader-aarch64.s],
[AC_MSG_ERROR([Missing `sp' in user_regs_struct])],
[[
#include $user_h
]])], [arm*linux*eabi* | armv7*linux*],
[AC_CHECK_MEMBER([struct user_regs.uregs],
[AC_DEFINE([SYSCALL_HEADER], [<asm/unistd.h>])
AC_DEFINE_UNQUOTED([USER_HEADER], [$user_h])
AC_DEFINE([USER_REGS_STRUCT], [struct user_regs])
AC_DEFINE([SYSCALL_NUM_REG], [[uregs[7]]])
AC_DEFINE([SYSCALL_RET_REG], [[uregs[0]]])
AC_DEFINE([SYSCALL_ARG_REG], [[uregs[0]]])
AC_DEFINE([SYSCALL_ARG1_REG], [[uregs[1]]])
AC_DEFINE([SYSCALL_ARG2_REG], [[uregs[2]]])
AC_DEFINE([SYSCALL_ARG3_REG], [[uregs[3]]])
AC_DEFINE([STACK_POINTER], [[uregs[13]]])
AC_DEFINE([PROGRAM_COUNTER], [[uregs[15]]])
AC_DEFINE([EXEC_SYSCALL], [__NR_execve])
AC_DEFINE([USER_WORD], [uintptr_t])
AC_DEFINE([USER_SWORD], [intptr_t])
AC_DEFINE([EXECUTABLE_BASE], [0x0f000000])
AC_DEFINE([INTERPRETER_BASE], [0x1f000000])
AC_DEFINE([STACK_GROWS_DOWNWARDS], [1])
AC_DEFINE([CLONE_SYSCALL], [__NR_clone])
AC_DEFINE([READLINK_SYSCALL], [__NR_readlink])
AC_DEFINE([READLINKAT_SYSCALL], [__NR_readlinkat])
AC_DEFINE([OPEN_SYSCALL], [__NR_open])
AC_DEFINE([OPENAT_SYSCALL], [__NR_openat])
exec_CHECK_LINUX_CLONE3
LOADERFLAGS="$LOADERFLAGS $LDPREFIX-Ttext=0x20000000"
exec_loader=loader-armeabi.s],
[AC_CHECK_MEMBER([struct pt_regs.uregs],
[AC_DEFINE([SYSCALL_HEADER], [<asm/unistd.h>])
AC_DEFINE_UNQUOTED([USER_HEADER], [<asm/ptrace.h>])
AC_DEFINE([USER_REGS_STRUCT], [struct pt_regs])
AC_DEFINE([SYSCALL_NUM_REG], [[uregs[7]]])
AC_DEFINE([SYSCALL_RET_REG], [[uregs[0]]])
AC_DEFINE([SYSCALL_ARG_REG], [[uregs[0]]])
AC_DEFINE([SYSCALL_ARG1_REG], [[uregs[1]]])
AC_DEFINE([SYSCALL_ARG2_REG], [[uregs[2]]])
AC_DEFINE([SYSCALL_ARG3_REG], [[uregs[3]]])
AC_DEFINE([STACK_POINTER], [[uregs[13]]])
AC_DEFINE([STACK_POINTER], [[uregs[15]]])
AC_DEFINE([EXEC_SYSCALL], [__NR_execve])
AC_DEFINE([USER_WORD], [uintptr_t])
AC_DEFINE([USER_SWORD], [intptr_t])
AC_DEFINE([EXECUTABLE_BASE], [0x0f000000])
AC_DEFINE([INTERPRETER_BASE], [0x1f000000])
AC_DEFINE([STACK_GROWS_DOWNWARDS], [1])
AC_DEFINE([CLONE_SYSCALL], [__NR_clone])
AC_DEFINE([READLINK_SYSCALL], [__NR_readlink])
AC_DEFINE([READLINKAT_SYSCALL], [__NR_readlinkat])
AC_DEFINE([OPEN_SYSCALL], [__NR_open])
AC_DEFINE([OPENAT_SYSCALL], [__NR_openat])
exec_CHECK_LINUX_CLONE3
LOADERFLAGS="$LOADERFLAGS $LDPREFIX-Ttext=0x20000000"
exec_loader=loader-armeabi.s],
[AC_MSG_ERROR([Missing `uregs' in user_regs_struct or pt_regs])],
[[
#include <asm/ptrace.h>
]])],
[[
#include $user_h
]])], [mipsel*linux*],
[AC_DEFINE([SYSCALL_HEADER], [<asm/unistd.h>])
AC_DEFINE([USER_HEADER], ["mipsel-user.h"])
AC_DEFINE([USER_REGS_STRUCT], [struct mipsel_regs])
AC_DEFINE([SYSCALL_NUM_REG], [[gregs[2]]]) # v0
AC_DEFINE([SYSCALL_RET_REG], [[gregs[4]]]) # a0
AC_DEFINE([SYSCALL_ARG_REG], [[gregs[4]]]) # a0
AC_DEFINE([SYSCALL_ARG1_REG], [[gregs[5]]]) # a1
AC_DEFINE([SYSCALL_ARG2_REG], [[gregs[4]]]) # a2
AC_DEFINE([SYSCALL_ARG3_REG], [[gregs[5]]]) # a3
AC_DEFINE([STACK_POINTER], [[gregs[29]]]) # sp
AC_DEFINE([PROGRAM_COUNTER], [[cp0_epc]]) # pc
AC_DEFINE([EXEC_SYSCALL], [__NR_execve])
AC_DEFINE([USER_WORD], [uintptr_t])
AC_DEFINE([USER_SWORD], [intptr_t])
AC_DEFINE([EXECUTABLE_BASE], [0x0f000000])
AC_DEFINE([INTERPRETER_BASE], [0x1f000000])
AC_DEFINE([STACK_GROWS_DOWNWARDS], [1])
AC_DEFINE([CLONE_SYSCALL], [__NR_clone])
AC_DEFINE([READLINK_SYSCALL], [__NR_readlink])
AC_DEFINE([READLINKAT_SYSCALL], [__NR_readlinkat])
AC_DEFINE([OPEN_SYSCALL], [__NR_open])
AC_DEFINE([OPENAT_SYSCALL], [__NR_openat])
AC_CHECK_DECL([_MIPS_SIM], [exec_CHECK_MIPS_NABI],
[AC_MSG_ERROR([_MIPS_SIM could not be determined]),
[[
#include <sgidefs.h>
]]])
exec_CHECK_LINUX_CLONE3
LOADERFLAGS="$LOADERFLAGS $LDPREFIX-Ttext=0x20000000"
is_mips=yes
exec_loader=loader-mipsel.s], [mips64el*linux*],
[AC_DEFINE([SYSCALL_HEADER], [<asm/unistd.h>])
AC_DEFINE([USER_HEADER], ["mipsel-user.h"])
AC_DEFINE([USER_REGS_STRUCT], [struct mipsel_regs])
AC_DEFINE([SYSCALL_NUM_REG], [[gregs[2]]]) # v0
AC_DEFINE([SYSCALL_RET_REG], [[gregs[4]]]) # a0
AC_DEFINE([SYSCALL_ARG_REG], [[gregs[4]]]) # a0
AC_DEFINE([SYSCALL_ARG1_REG], [[gregs[5]]]) # a1
AC_DEFINE([SYSCALL_ARG2_REG], [[gregs[4]]]) # a2
AC_DEFINE([SYSCALL_ARG3_REG], [[gregs[5]]]) # a3
AC_DEFINE([STACK_POINTER], [[gregs[29]]]) # sp
AC_DEFINE([PROGRAM_COUNTER], [[cp0_epc]]) # pc
AC_DEFINE([EXEC_SYSCALL], [__NR_execve])
AC_DEFINE([USER_WORD], [uintptr_t])
AC_DEFINE([USER_SWORD], [intptr_t])
AC_DEFINE([EXEC_64], [1])
AC_DEFINE([EXECUTABLE_BASE], [0x400000])
AC_DEFINE([INTERPRETER_BASE], [0x3f00000000])
AC_DEFINE([STACK_GROWS_DOWNWARDS], [1])
AC_DEFINE([CLONE_SYSCALL], [__NR_clone])
AC_DEFINE([READLINK_SYSCALL], [__NR_readlink])
AC_DEFINE([READLINKAT_SYSCALL], [__NR_readlinkat])
AC_DEFINE([OPEN_SYSCALL], [__NR_open])
AC_DEFINE([OPENAT_SYSCALL], [__NR_openat])
AC_CACHE_CHECK([whether as understands `daddi'],
[exec_cv_as_daddi],
[exec_cv_as_daddi=no
cat <<_ACEOF >conftest.s
.section text
.global __start
__start:
li $t0, 0
li $t1, 0
daddi $t0, $t1, 1
daddi $t0, $t1, -1
daddi $t0, -1
daddi $t0, 1
_ACEOF
$AS $ASFLAGS conftest.s -o conftest.$OBJEXT \
>&AS_MESSAGE_LOG_FD 2>&1 \
&& exec_cv_as_daddi=yes
rm -f conftest.s conftest.$OBJEXT])
AS_IF([test "x$exec_cv_as_daddi" != "xyes"],
[DADDI_BROKEN=yes])
exec_CHECK_LINUX_CLONE3
exec_CHECK_MIPS_NABI
LOADERFLAGS="$LOADERFLAGS $LDPREFIX-Ttext=0x3e00000000"
is_mips=yes
exec_loader=loader-mips64el.s], [*],
[AC_MSG_ERROR([Please port libexec to $host])])
AC_SUBST([DADDI_BROKEN])
MIPS_N32=$exec_cv_mips_nabi
AC_ARG_VAR([LOADERFLAGS], [Flags used to link the loader.])
AC_ARG_VAR([ARFLAGS], [Flags for the archiver.])
AC_ARG_VAR([ASFLAGS], [Flags for the assembler.])
# Search for seccomp headers and declarations.
AC_CHECK_HEADERS([linux/seccomp.h linux/filter.h],
[AC_CHECK_DECLS([SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, SECCOMP_RET_TRACE],
[AC_DEFINE([HAVE_SECCOMP], [1])], [],
[[#include <linux/seccomp.h>]])])
# Make the assembler optimize for code size. Don't do this on MIPS,
# as the assembler code manages branch delays manually.
AC_CACHE_CHECK([whether as understands -O],
[exec_cv_as_O],
[exec_cv_as_O=no
cat <<_ACEOF >conftest.s
.section text
.global _start
_start:
_ACEOF
$AS $ASFLAGS -O conftest.s -o conftest.$OBJEXT \
>&AS_MESSAGE_LOG_FD 2>&1 \
&& exec_cv_as_O=yes
rm -f conftest.s conftest.$OBJEXT])
AS_IF([test "$exec_cv_as_O" = "yes" \
&& test "$is_mips" != "yes"],
[ASFLAGS="$ASFLAGS -O"])
# Make the assembler generate debug information.
AC_CACHE_CHECK([whether as understands -g],
[exec_cv_as_g],
[exec_cv_as_g=no
cat <<_ACEOF >conftest.s
.section text
.global _start
_start:
_ACEOF
$AS $ASFLAGS -g conftest.s -o conftest.$OBJEXT \
>&AS_MESSAGE_LOG_FD 2>&1 \
&& exec_cv_as_g=yes
rm -f conftest.s conftest.$OBJEXT])
AS_IF([test "$exec_cv_as_g" = "yes"], [ASFLAGS="$ASFLAGS -g"])
# Check for the ability to automatically generate dependencies for C
# source files.
AUTO_DEPEND=no
AS_IF([test "x$GCC" = xyes],
[AC_CACHE_CHECK([whether gcc understands -MMD -MF],
[exec_cv_autodepend],
[SAVE_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -MMD -MF deps.d -MP"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
[exec_cv_autodepend=yes],
[exec_cv_autodepend=no])
CFLAGS="$SAVE_CFLAGS"
test -f deps.d || emacs_cv_autodepend=no
rm -rf deps.d])
AS_IF([test "x$exec_cv_autodepend" = xyes],
[AUTO_DEPEND=yes
AS_MKDIR_P([deps])])])
# Now check for some other stuff.
AC_CACHE_CHECK([for 'find' args to delete a file],
[exec_cv_find_delete],
[AS_IF([touch conftest.tmp && find conftest.tmp -delete 2>/dev/null &&
test ! -f conftest.tmp], [exec_cv_find_delete="-delete"],
[exec_cv_find_delete="-exec rm -f {} ';'"])])
FIND_DELETE=$exec_cv_find_delete
AC_SUBST([FIND_DELETE])
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_FILES([Makefile])
AS_IF([test "x$is_mips" = xyes],
[AC_CONFIG_FILES ([config-mips.m4])])
AC_SUBST([AUTO_DEPEND])
AC_SUBST([LOADERFLAGS])
AC_SUBST([ARFLAGS])
AC_SUBST([ASFLAGS])
AC_SUBST([exec_loader])
AC_SUBST([MIPS_N32])
AC_SUBST([OBJS])
AC_SUBST([is_mips])
AC_OUTPUT
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