Update Android port

* Makefile.in (extraclean): Clean in exec as well.
* configure.ac: Fix detection of absolute srcdir.  Also, pass
CFLAGS.
* exec/Makefile.in: (.c.o): Add -I. so config.h can be
found.:(.s.o): Don't create m4 temporary in srcdir.
* exec/config-mips.m4.in (DADDI2, DADDI3): New macros.  Define
to substitute if as cannot assemble daddi.
* exec/configure.ac (user_h): Look for user.h in asm/ as well.
Use new user.h.  Also look in ptrace.h on arm systems.  Check if
as supports daddi on mips64.
* exec/exec.c (check_interpreter): Fix char signedness bug.
* exec/loader-mips64el.s (__start): Use DADDI2 and DADDI3 for
two- and 3-operand daddi.
* exec/mipsel-user.h: Don't include sgidefs.h.
* java/INSTALL: Document that m4 is now required.
* src/android.c (android_rewrite_spawn_argv): Add missing NULL.

6 files changed, 95 insertions, 35 deletions

diff --git a/exec/Makefile.in b/exec/Makefile.in
index 5bd61b2e831..365dc42e0b7 100644
--- a/exec/Makefile.in
+++ b/exec/Makefile.in
@@ -81,10 +81,10 @@ Makefile: config.status Makefile.in
 
 .SUFFIXES: .c .s
 .c.o:
-	$(CC) -c $(CPPFLAGS) $(CFLAGS) $(DEPFLAGS) -I$(srcdir) $< -o $@
+	$(CC) -c $(CPPFLAGS) $(CFLAGS) $(DEPFLAGS) -I$(srcdir) -I. $< -o $@
 .s.o:
-	$(M4) $< > $<.s
-	$(AS) $(ASFLAGS) $<.s -o $@
+	$(M4) $< > $(notdir $<).s
+	$(AS) $(ASFLAGS) $(notdir $<).s -o $@
 
 # Set up dependencies for config-mips.m4.
 
diff --git a/exec/config-mips.m4.in b/exec/config-mips.m4.in
index 886d19b8e8f..72632765bd0 100644
--- a/exec/config-mips.m4.in
+++ b/exec/config-mips.m4.in
@@ -34,3 +34,9 @@ define(`SYSCALL', `ifelse(`@MIPS_N32@',`yes',`	move	$a4, $1
 	sw	$4, 28($sp)')')
 
 define(`RESTORE', `ifelse(`@MIPS_N32@',`yes',`	nop',`	addi	$sp, 32')')
+
+dnl For mips64.  Some assemblers don't want to assemble `daddi'.
+define(`DADDI2', `ifelse(`@DADDI_BROKEN@',`yes',`	li	$at, $2
+dadd		 $1, $1, $at',`	daddi	$1, $2')')
+define(`DADDI3', `ifelse(`@DADDI_BROKEN@',`yes',`	li	$at, $3
+dadd		 $1, $2, $at',`	daddi	$1, $2, $3')')
diff --git a/exec/configure.ac b/exec/configure.ac
index 0a334c6e4ff..9763edc99f3 100644
--- a/exec/configure.ac
+++ b/exec/configure.ac
@@ -96,6 +96,13 @@ AH_TEMPLATE([CLONE3_SYSCALL], [Define to number of the `clone3' system call.])
 
 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.])
@@ -187,11 +194,12 @@ AS_IF([test "x$exec_cv_mips_nabi" != "xno"],
 exec_loader=
 is_mips=
 OBJS="exec.o trace.o"
+DADDI_BROKEN=no
 
 AS_CASE([$host], [x86_64-*linux*],
   [AC_CHECK_MEMBER([struct user_regs_struct.rdi],
     [AC_DEFINE([SYSCALL_HEADER], [<asm/unistd.h>])
-     AC_DEFINE([USER_HEADER], [<sys/user.h>])
+     AC_DEFINE_UNQUOTED([USER_HEADER], [$user_h])
      AC_DEFINE([USER_REGS_STRUCT], [struct user_regs_struct])
      AC_DEFINE([SYSCALL_NUM_REG], [orig_rax])
      AC_DEFINE([SYSCALL_RET_REG], [rax])
@@ -213,11 +221,11 @@ AS_CASE([$host], [x86_64-*linux*],
      exec_loader=loader-x86_64.s],
     [AC_MSG_ERROR([Missing `rdi' in user_regs_struct])],
     [[
-#include <sys/user.h>
+#include $user_h
     ]])], [i[[34567]]86-*linux*],
   [AC_CHECK_MEMBER([struct user_regs_struct.edi],
     [AC_DEFINE([SYSCALL_HEADER], [<asm/unistd.h>])
-     AC_DEFINE([USER_HEADER], [<sys/user.h>])
+     AC_DEFINE_UNQUOTED([USER_HEADER], [$user_h])
      AC_DEFINE([USER_REGS_STRUCT], [struct user_regs_struct])
      AC_DEFINE([SYSCALL_NUM_REG], [orig_eax])
      AC_DEFINE([SYSCALL_RET_REG], [eax])
@@ -237,11 +245,11 @@ AS_CASE([$host], [x86_64-*linux*],
      exec_loader=loader-x86.s],
     [AC_MSG_ERROR([Missing `edi' in user_regs_struct])],
     [[
-#include <sys/user.h>
+#include $user_h
     ]])], [aarch64-*linux*],
   [AC_CHECK_MEMBER([struct user_regs_struct.sp],
     [AC_DEFINE([SYSCALL_HEADER], [<asm/unistd.h>])
-     AC_DEFINE([USER_HEADER], [<sys/user.h>])
+     AC_DEFINE_UNQUOTED([USER_HEADER], [$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]]])
@@ -263,11 +271,11 @@ AS_CASE([$host], [x86_64-*linux*],
      exec_loader=loader-aarch64.s],
     [AC_MSG_ERROR([Missing `sp' in user_regs_struct])],
     [[
-#include <sys/user.h>
+#include $user_h
     ]])], [arm*linux*eabi* | armv7*linux*],
   [AC_CHECK_MEMBER([struct user_regs.uregs],
     [AC_DEFINE([SYSCALL_HEADER], [<asm/unistd.h>])
-     AC_DEFINE([USER_HEADER], [<sys/user.h>])
+     AC_DEFINE_UNQUOTED([USER_HEADER], [$user_h])
      AC_DEFINE([USER_REGS_STRUCT], [struct user_regs])
      AC_DEFINE([SYSCALL_NUM_REG], [[uregs[7]]])
      AC_DEFINE([SYSCALL_RET_REG], [[uregs[0]]])
@@ -283,9 +291,30 @@ AS_CASE([$host], [x86_64-*linux*],
      exec_CHECK_LINUX_CLONE3
      LOADERFLAGS="$LOADERFLAGS $LDPREFIX-Ttext=0x20000000"
      exec_loader=loader-armeabi.s],
-    [AC_MSG_ERROR([Missing `uregs' in user_regs_struct])],
+    [AC_CHECK_MEMBER([struct pt_regs.uregs],
+      [AC_DEFINE([SYSCALL_HEADER], [<asm/unistd.h>])
+       AC_DEFINE_UNQUOTED([USER_HEADER], [<asm/ptrace.h>])
+       AC_DEFINE([USER_REGS_STRUCT], [struct pt_regs])
+       AC_DEFINE([SYSCALL_NUM_REG], [[uregs[7]]])
+       AC_DEFINE([SYSCALL_RET_REG], [[uregs[0]]])
+       AC_DEFINE([SYSCALL_ARG_REG], [[uregs[0]]])
+       AC_DEFINE([SYSCALL_ARG1_REG], [[uregs[1]]])
+       AC_DEFINE([STACK_POINTER], [[uregs[13]]])
+       AC_DEFINE([EXEC_SYSCALL], [__NR_execve])
+       AC_DEFINE([USER_WORD], [uintptr_t])
+       AC_DEFINE([EXECUTABLE_BASE], [0x0f000000])
+       AC_DEFINE([INTERPRETER_BASE], [0x1f000000])
+       AC_DEFINE([STACK_GROWS_DOWNWARDS], [1])
+       AC_DEFINE([CLONE_SYSCALL], [__NR_clone])
+       exec_CHECK_LINUX_CLONE3
+       LOADERFLAGS="$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 <sys/user.h>
+#include $user_h
     ]])], [mipsel*linux*],
   [AC_DEFINE([SYSCALL_HEADER], [<asm/unistd.h>])
    AC_DEFINE([USER_HEADER], ["mipsel-user.h"])
@@ -325,6 +354,27 @@ AS_CASE([$host], [x86_64-*linux*],
    AC_DEFINE([INTERPRETER_BASE], [0x3f00000000])
    AC_DEFINE([STACK_GROWS_DOWNWARDS], [1])
    AC_DEFINE([CLONE_SYSCALL], [__NR_clone])
+   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 $LDPREFIX-Ttext=0x3e00000000"
@@ -332,6 +382,8 @@ AS_CASE([$host], [x86_64-*linux*],
    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.])
diff --git a/exec/exec.c b/exec/exec.c
index e890179a9ab..662c8bf69d2 100644
--- a/exec/exec.c
+++ b/exec/exec.c
@@ -95,7 +95,7 @@ check_interpreter (const char *name, int fd, const char **extra)
 
   /* Strip leading whitespace.  */
   start = buffer;
-  while (*start && *start < 128 && isspace (*start))
+  while (*start && ((unsigned char) *start) < 128 && isspace (*start))
     ++start;
 
   /* Look for a newline character.  */
diff --git a/exec/loader-mips64el.s b/exec/loader-mips64el.s
index ccebdfe72f6..73dc8c63fe8 100644
--- a/exec/loader-mips64el.s
+++ b/exec/loader-mips64el.s
@@ -15,7 +15,10 @@
 # You should have received a copy of the GNU General Public License
 # along with GNU Emacs.	 If not, see <https://www.gnu.org/licenses/>.
 
+include(`config-mips.m4')
+
 	.set noreorder			# delay slots managed by hand
+	.set noat			# no assembler macros
 	.section .text
 	.global __start
 __start:
@@ -24,8 +27,8 @@ dnl	dla	$a0, .timespec		# rqtp
 dnl	li	$a1, 0			# rmtp
 dnl	syscall				# syscall
 	ld	$s2, ($sp)		# original stack pointer
-	daddi	$s0, $sp, 16		# start of load area
-	daddi	$sp, -16		# primary fd, secondary fd
+	DADDI3(	$s0, $sp, 16)		# start of load area
+	DADDI2(	$sp, -16)		# primary fd, secondary fd
 	li	$t0, -1			# secondary fd
 	sd	$t0, 8($sp)		# initialize secondary fd
 .next_action:
@@ -33,7 +36,7 @@ dnl	syscall				# syscall
 	andi	$t0, $s1, 15		# t0 = action number & 15
 	beqz	$t0, .open_file		# open file?
 	nop				# delay slot
-	daddi	$t0, -3			# t0 -= 3
+	DADDI2(	$t0, -3)		# t0 -= 3
 	beqz	$t0, .rest_of_exec	# jump to code
 	nop				# delay slot
 	li	$t1, 1
@@ -76,30 +79,30 @@ dnl	syscall				# syscall
 	bne	$t2, $zero, .fillb	# fill bytes
 	nop				# delay slot
 	sd	$zero, ($t1)		# zero doubleword
-	daddi	$t1, 8			# next doubleword
+	DADDI2(	$t1, 8)			# next doubleword
 	sd	$zero, ($t1)		# zero doubleword
-	daddi	$t1, 8			# next doubleword
+	DADDI2(	$t1, 8)			# next doubleword
 	sd	$zero, ($t1)		# zero doubleword
-	daddi	$t1, 8			# next doubleword
+	DADDI2(	$t1, 8)			# next doubleword
 	sd	$zero, ($t1)		# zero doubleword
-	daddi	$t1, 8			# next doubleword
+	DADDI2(	$t1, 8)			# next doubleword
 	sd	$zero, ($t1)		# zero doubleword
-	daddi	$t1, 8			# next doubleword
+	DADDI2(	$t1, 8)			# next doubleword
 	sd	$zero, ($t1)		# zero doubleword
-	daddi	$t1, 8			# next doubleword
+	DADDI2(	$t1, 8)			# next doubleword
 	sd	$zero, ($t1)		# zero doubleword
-	daddi	$t1, 8			# next doubleword
+	DADDI2(	$t1, 8)			# next doubleword
 	sd	$zero, ($t1)		# zero doubleword
-	daddi	$t1, 8			# next doubleword
+	DADDI2(	$t1, 8)			# next doubleword
 	j	.filld			# fill either doubleword or byte
 	nop				# delay slot
 .fillb:
 	beq	$t0, $t1, .continue	# already finished?
 	nop				# delay slot
 	sb	$zero, ($t1)		# clear byte
-	daddi	$t1, $t1, 1		# t1++
+	DADDI2(	$t1, 1)			# t1++
 .continue:
-	daddi	$s0, $s0, 56		# s0 = next action
+	DADDI2(	$s0, 56)		# s0 = next action
 	j	.next_action		# next action
 	nop				# delay slot
 .do_mmap_anon:
@@ -113,26 +116,26 @@ dnl	syscall				# syscall
 	nop				# branch delay slot
 .open_file:
 	li	$v0, 5002		# SYS_open
-	daddi	$a0, $s0, 8		# start of name
+	DADDI3(	$a0, $s0, 8)		# start of name
 	move	$a1, $zero		# flags = O_RDONLY
 	move	$a2, $zero		# mode = 0
 	syscall				# syscall
 	bne	$a3, $zero, .perror	# perror
 	nop				# delay slot
-	daddi	$s0, $s0, 8		# start of string
+	DADDI2(	$s0, 8)			# start of string
 .nextc:
 	lb	$t0, ($s0)		# load byte
-	daddi	$s0, $s0, 1		# s0++
+	DADDI2(	$s0, 1)			# s0++
 	bne	$t0, $zero, .nextc	# next character?
 	nop				# delay slot
-	daddi	$s0, $s0, 7		# adjust for round
+	DADDI2(	$s0, 7)			# adjust for round
 	li	$t2, -8			# t2 = -8
 	and	$s0, $s0, $t2		# mask for round
 	andi	$t0, $s1, 16		# t1 = s1 & 16
 	move	$t1, $sp		# address of primary fd
 	beqz	$t0, .primary		# primary fd?
 	nop				# delay slot
-	daddi	$t1, $t1, 8		# address of secondary fd
+	DADDI2(	$t1, 8)			# address of secondary fd
 .primary:
 	sd	$v0, ($t1)		# store fd
 	j	.next_action		# next action
@@ -145,11 +148,11 @@ dnl	syscall				# syscall
 	move	$s1, $s2		# original SP
 	ld	$t0, ($s1)		# argc
 	dsll	$t0, $t0, 3		# argc *= 3
-	daddi	$t0, $t0, 16		# argc += 16
+	DADDI2(	$t0, 16)		# argc += 16
 	dadd	$s1, $s1, $t0		# s1 = start of envp
 .skipenv:
 	ld	$t0, ($s1)		# t0 = *s1
-	daddi	$s1, $s1, 8		# s1++
+	DADDI2(	$s1, 8)			# s1++
 	bne	$t0, $zero, .skipenv	# skip again
 	nop				# delay slot
 	dla	$t3, .auxvtab		# address of auxv table
@@ -170,7 +173,7 @@ dnl	syscall				# syscall
 	ld	$t2, ($t2)		# t2 = *t2
 	sd	$t2, 8($s1)		# set auxv value
 .next:
-	daddi	$s1, $s1, 16		# next auxv
+	DADDI2(	$s1, 16)		# next auxv
 	j	.one_auxv		# next auxv
 	nop				# delay slot
 .finish:
diff --git a/exec/mipsel-user.h b/exec/mipsel-user.h
index 2b77a970d8e..dc3f98eb4e7 100644
--- a/exec/mipsel-user.h
+++ b/exec/mipsel-user.h
@@ -22,7 +22,6 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
 #ifndef _MIPSEL_USER_H_
 #define _MIPSEL_USER_H_
 
-#include <sgidefs.h>
 #include <sys/user.h>
 
 #ifndef ELF_NGREG