* microblaze/_exception_handler.S: Adjust to be weak.

* microblaze/Makefile.in: Add LINUX_BSP.
	* microblaze/elf-gloss-linux.ld: New file.
	* microblaze/elf-gloss-linux.specs: Likewise.
	* microblaze/linux-crt0.S: Likewise.
	* microblaze/linux-inbyte.c: Likewise.
	* microblaze/linux-outbyte.c: Likewise.
	* microblaze/linux-syscalls-wrap.c: Likewise.
	* microblaze/linux-syscalls.S: Likewise.
	* microblaze/linux-syscalls.h: Likewise.

libgloss/ChangeLog

@@ -1,3 +1,19 @@
+2013-07-23  Nagaraju Mekala  <nagaraju.mekala@xilinx.com>
+
+	* microblaze/_exception_handler.S: Adjust to be weak.
+
+2013-07-23  Edgar E. Iglesias  <edgar.iglesias@xilinx.com>
+
+	* microblaze/Makefile.in: Add LINUX_BSP.
+	* microblaze/elf-gloss-linux.ld: New file.
+	* microblaze/elf-gloss-linux.specs: Likewise.
+	* microblaze/linux-crt0.S: Likewise.
+	* microblaze/linux-inbyte.c: Likewise.
+	* microblaze/linux-outbyte.c: Likewise.
+	* microblaze/linux-syscalls-wrap.c: Likewise.
+	* microblaze/linux-syscalls.S: Likewise.
+	* microblaze/linux-syscalls.h: Likewise.
+
 2013-07-17  Yaakov Selkowitz  <yselkowitz@users.sourceforge.net>
 
 	* lm32/configure: Regenerate.

libgloss/microblaze/Makefile.in

@@ -84,25 +84,37 @@ OBJS = ${GENOBJS} sbrk.o timer.o _exception_handler.o _hw_exception_handler.o \
        xil_malloc.o xil_sbrk.o xil_printf.o
 SCRIPTS	= xilinx.ld
 
+# Tiny Linux BSP.
+LINUX_BSP     = libgloss-linux.a
+CRT          += linux-crt0.o
+LINUX_OBJS    = linux-syscalls.o linux-syscalls-wrap.o
+LINUX_OBJS   += linux-outbyte.o linux-inbyte.o
+LINUX_SCRIPTS = elf-gloss-linux.specs
+
 CPU = @CPU@
 
 #### Host specific Makefile fragment comes in here.
 @host_makefile_frag@
 
-all: ${CRT} ${LIB}
+all: ${CRT} ${LIB} ${LINUX_BSP}
 
-install: ${CRT} ${LIB}
+install: ${CRT} ${LIB} install-linux
 	@for crt in ${CRT}; do \
 	$(INSTALL_PROGRAM) $${crt} $(DESTDIR)$(tooldir)/lib${MULTISUBDIR}/$${crt}; \
 	done
 	$(INSTALL_PROGRAM) ${LIB} $(DESTDIR)$(tooldir)/lib${MULTISUBDIR}
 	$(INSTALL_PROGRAM) $(srcdir)/${SCRIPTS} $(DESTDIR)$(tooldir)/lib/
 
+install-linux: ${LINUX_BSP}
+	$(INSTALL_PROGRAM) ${LINUX_BSP} $(DESTDIR)$(tooldir)/lib${MULTISUBDIR}
+	set -e; for x in ${LINUX_SCRIPTS}; do ${INSTALL_DATA} ${srcdir}/${objtype}$$x $(DESTDIR)${tooldir}/lib${MULTISUBDIR}/$$x; done
+
 crt0.o:	crt0.S
 crt1.o:	crt1.S
 crt2.o:	crt2.S
 crt3.o:	crt3.S
 crt4.o:	crt4.S
+linux-crt0.o: linux-crt0.S
 crtinit.o: crtinit.S
 sim-crtinit.o: sim-crtinit.S
 sim-pgcrtinit.o: sim-pgcrtinit.S
@@ -120,6 +132,10 @@ ${LIB}:	${OBJS}
 	${AR} ${ARFLAGS} $@ ${OBJS}
 	${RANLIB} $@
 
+${LINUX_BSP}: ${LINUX_OBJS}
+	${AR} ${ARFLAGS} $@ ${LINUX_OBJS}
+	${RANLIB} $@
+
 .PHONY: info dvi doc install-info clean-info
 info doc dvi:
 install-info:

libgloss/microblaze/_exception_handler.S

@@ -30,9 +30,11 @@
 */
 
 	.text
-	.globl _exception_handler    # Exception Handler Label 
 	.align 2
+	.weakext _exception_handler
+	.ent _exception_handler
+	.type _exception_handler, @function
 	
 	_exception_handler:
-	rtsd    r17, 0
+	addi r11,r11,8
-	nop
+	bra r11

libgloss/microblaze/elf-gloss-linux.ld

@@ -0,0 +1,159 @@
+/* Default linker script, for normal executables */
+/*OUTPUT_FORMAT("elf32-microblaze", "", "") */
+/*SEARCH_DIR("/proj/fv1/gnu_builds/head/mb/release/lin/mb/microblaze-xilinx-elf/lib");*/
+/*SEARCH_DIR("/proj/fv1/gnu_builds/head/mb/release/lin/mb/microblaze-xilinx-elf/lib");*/
+OUTPUT_ARCH(microblaze)
+ENTRY(_start)
+_TEXT_START_ADDR = DEFINED(_TEXT_START_ADDR) ? _TEXT_START_ADDR : 0x50;
+
+PHDRS
+{
+  text PT_LOAD FILEHDR PHDRS;
+  data PT_LOAD;
+  bss PT_LOAD;
+}
+
+SECTIONS
+{
+  . = SIZEOF_HEADERS;
+   _ftext  =  .;
+  .text : {
+    *(.text)
+    *(.text.*)
+    *(.gnu.linkonce.t.*)
+  } : text
+   _etext  =  .;
+  .init : { KEEP (*(.init))	} =0
+  .fini : { KEEP (*(.fini))	} =0
+  PROVIDE (__CTOR_LIST__ = .);
+  PROVIDE (___CTOR_LIST__ = .);
+  .ctors   :
+  {
+    /* gcc uses crtbegin.o to find the start of
+       the constructors, so we make sure it is
+       first.  Because this is a wildcard, it
+       doesn't matter if the user does not
+       actually link against crtbegin.o; the
+       linker won't look for a file to match a
+       wildcard.  The wildcard also means that it
+       doesn't matter which directory crtbegin.o
+       is in.  */
+    KEEP (*crtbegin.o(.ctors))
+    /* We don't want to include the .ctor section from
+       from the crtend.o file until after the sorted ctors.
+       The .ctor section from the crtend file contains the
+       end of ctors marker and it must be last */
+    KEEP (*(EXCLUDE_FILE (*crtend.o) .ctors))
+    KEEP (*(SORT(.ctors.*)))
+    KEEP (*(.ctors))
+  } : text
+  PROVIDE (__CTOR_END__ = .);
+  PROVIDE (___CTOR_END__ = .);
+  PROVIDE (__DTOR_LIST__ = .);
+  PROVIDE (___DTOR_LIST__ = .);
+   .dtors         :
+  {
+    KEEP (*crtbegin.o(.dtors))
+    KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors))
+    KEEP (*(SORT(.dtors.*)))
+    KEEP (*(.dtors))
+  } : text
+  PROVIDE (__DTOR_END__ = .);
+  PROVIDE (___DTOR_END__ = .);
+   . = ALIGN(4);
+    _frodata = . ;
+  .rodata : {
+    *(.rodata)
+    *(.rodata.*)
+    *(.gnu.linkonce.r.*)
+    CONSTRUCTORS; /* Is this needed? */
+  } : text
+  _erodata = .;
+  /* New page.  */
+  . += 0x1000;
+  /* Alignments by 8 to ensure that _SDA2_BASE_ on a word boundary */
+  /* Note that .sdata2 and .sbss2 must be contiguous */
+  . = ALIGN(8);
+   _ssrw = .;
+  .sdata2 : {
+    *(.sdata2)
+    *(.sdata2.*)
+    *(.gnu.linkonce.s2.*)
+  } : data
+  . = ALIGN(4);
+  .sbss2 : {
+    PROVIDE (__sbss2_start = .);
+    *(.sbss2)
+    *(.sbss2.*)
+    *(.gnu.linkonce.sb2.*)
+    PROVIDE (__sbss2_end = .);
+  } : data
+  . = ALIGN(8);
+   _essrw = .;
+   _ssrw_size = _essrw - _ssrw;
+   PROVIDE (_SDA2_BASE_ = _ssrw + (_ssrw_size / 2 ));
+   . = ALIGN(4);
+   _fdata = .;
+  .data : {
+    *(.data)
+    *(.gnu.linkonce.d.*)
+    CONSTRUCTORS; /* Is this needed? */
+    PROVIDE (__bss_start = .);
+  } : data
+   _edata = . ;
+   /* Added to handle pic code */
+  .got : {
+    *(.got)
+  }
+  .got1 : {
+    *(.got1)
+  }
+  .got2 : {
+    *(.got2)
+  }
+  /* Added by Sathya to handle C++ exceptions */
+  .eh_frame : {
+    *(.eh_frame)
+  }
+  .jcr : {
+    *(.jcr)
+  . = ALIGN(4096);
+  }
+  .gcc_except_table : {
+    *(.gcc_except_table)
+  }
+  . = ALIGN(4096);
+  /* Alignments by 8 to ensure that _SDA_BASE_ on a word boundary */
+  /* Note that .sdata and .sbss must be contiguous */
+  . = ALIGN(8);
+   _ssro = .;
+  .sdata : {
+    *(.sdata)
+    *(.sdata.*)
+    *(.gnu.linkonce.s.*)
+  }
+  . = ALIGN(4);
+  .sbss : {
+    PROVIDE (__sbss_start = .);
+    *(.sbss)
+    *(.sbss.*)
+    *(.gnu.linkonce.sb.*)
+    PROVIDE (__sbss_end = .);
+  }
+  . = ALIGN(8);
+   _essro = .;
+   _ssro_size = _essro - _ssro;
+  PROVIDE (_SDA_BASE_ = _ssro + (_ssro_size / 2 ));
+  . = ALIGN(4);
+   _fbss = .;
+  .bss : {
+    PROVIDE (__bss_start = .);
+    *(.bss)
+    *(.bss.*)
+    *(.gnu.linkonce.b.*)
+    *(COMMON)
+    . = ALIGN(4);
+    PROVIDE (__bss_end = .);
+    . = ALIGN(4096);
+  } : bss
+}

libgloss/microblaze/elf-gloss-linux.specs

@@ -0,0 +1,14 @@
+%rename link old_link
+%rename lib libc
+
+*link:
+%(old_link) -defsym _TEXT_START_ADDR=0x10000 -z max-page-size=4096 -z common-page-size=4096 --no-omagic
+
+*libgloss:
+-lgloss-linux
+
+*lib:
+-start-group -lgloss-linux -lxil-linux -lc -lm -end-group
+
+*startfile:
+linux-crt0%O%s crtbegin%O%s

libgloss/microblaze/linux-crt0.S

@@ -0,0 +1,58 @@
+/* linux-crt0 -- Startup routines for the Linux BSP.
+ *
+ * Copyright (c) 2011 Edgar E. Iglesias
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+
+        .section .text
+        .globl _start
+        .ent _start
+        .type _start, @function
+_start:
+	la	r13, r0, _SDA_BASE_
+	la	r2, r0, _SDA2_BASE_
+
+	brlid	r15, __init
+	nop
+
+	lwi	r5, r1, 0
+	addik	r6, r1, 4
+
+	# Add argc * 4.
+	addk	r7, r5, r5
+	addk	r7, r7, r7
+
+	brlid	r15, main
+	# Now add 4 + r1 (i.e r6) in the delayslot.
+	addk	r7, r7, r6
+
+	brlid   r15, exit
+        addik   r5, r3, 0
+	.size _start, . - _start
+        .end _start
+
+	/* Replacement for the GCC provided crti.S. This one avoids the
+	   setup of stack protection regs (which result in privilieged
+	   insn exceptions when running in user-space).  */
+        .section .init, "ax"
+	.global __init
+	.align 2
+__init:
+	addik   r1, r1, -8
+	sw      r15, r0, r1
+
+	.section .fini, "ax"
+	.global __fini
+	.align 2
+__fini:
+	addik   r1, r1, -8
+	sw      r15, r0, r1

libgloss/microblaze/linux-inbyte.c

@@ -0,0 +1,6 @@
+int inbyte(void)
+{
+	char ch = 0;
+	read(0, &ch, 1);
+	return ch;
+}

libgloss/microblaze/linux-outbyte.c

@@ -0,0 +1,4 @@
+void outbyte (unsigned char c)
+{
+	_write(1, &c, 1);
+}

libgloss/microblaze/linux-syscalls-wrap.c

@@ -0,0 +1,7 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+int isatty (int fd) {
+	return 1;
+}

libgloss/microblaze/linux-syscalls.S

@@ -0,0 +1,45 @@
+/* linux-syscalls - Syscall interface to microblaze linux
+ *
+ * Copyright (c) 2011 Edgar E. Iglesias
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+
+#include "linux-syscalls.h"
+
+#define FUNC(name) .type name, %function; name:
+
+#define GLOBAL(name) .global name; FUNC(name)
+#define SIZE(name) .size name, .-name
+
+# define SYSCALL_BODY(name)		\
+	addik	r12, r0, SYS_ ## name;	\
+	brki    r14, 8;			\
+	rtsd	r15, 8;			\
+	nop;
+
+# define SYSCALL(name)			\
+        GLOBAL(_ ## name);		\
+	SYSCALL_BODY(name);		\
+        SIZE(_ ## name)
+
+SYSCALL(brk)
+SYSCALL(exit)
+SYSCALL(read)
+SYSCALL(write)
+SYSCALL(open)
+SYSCALL(close)
+SYSCALL(lseek)
+SYSCALL(fstat)
+SYSCALL(unlink)
+SYSCALL(getpid)
+SYSCALL(kill)
+SYSCALL(rt_sigaction)

libgloss/microblaze/linux-syscalls.h

@@ -0,0 +1,28 @@
+/** Linux system call interface for the MicroBlaze processor.
+ * Copyright (c) 2009 Edgar E. Iglesias.
+ *
+ * Permission to use, copy, modify, and distribute this software
+ * is freely granted, provided that this notice is preserved.
+ */
+
+#define SYS_exit	1
+#define SYS_fork	2
+#define SYS_read	3
+#define SYS_write	4
+#define SYS_open	5
+#define SYS_close	6
+#define SYS_waitpid	7
+#define SYS_creat	8
+#define SYS_link	9
+#define SYS_unlink	10
+#define SYS_execve	11
+#define SYS_chdir	12
+#define SYS_time	13
+
+#define SYS_lseek	19
+#define SYS_getpid	20
+#define SYS_kill	37
+#define SYS_brk		45
+#define SYS_fstat	108
+
+#define SYS_rt_sigaction  174