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authorNathan Sidwell <nathan@codesourcery.com>2005-12-12 14:16:41 +0300
committerNathan Sidwell <nathan@codesourcery.com>2005-12-12 14:16:41 +0300
commitad83f0cc13928b8d465e7bc39edb28666570dc18 (patch)
tree3cc4fb0ac26e32a66b645e7055890a6640ab5946 /libgloss/mt/crt0-16-003.S
parent2193d02b4ddfc329e0817258093a40050b2d582a (diff)
Rename ms1 files to mt files (part 1 -- renames only)
Diffstat (limited to 'libgloss/mt/crt0-16-003.S')
-rw-r--r--libgloss/mt/crt0-16-003.S112
1 files changed, 112 insertions, 0 deletions
diff --git a/libgloss/mt/crt0-16-003.S b/libgloss/mt/crt0-16-003.S
new file mode 100644
index 000000000..bd88bcc54
--- /dev/null
+++ b/libgloss/mt/crt0-16-003.S
@@ -0,0 +1,112 @@
+; crt0.s - Startup code for the mrisc1. This code initializes the C
+; run-time model.
+;
+;
+; Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+;
+; 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.
+;
+
+ ; Create a label for the start of the eh_frame section.
+ .section .eh_frame
+__eh_frame_begin:
+
+ .text
+ .global _start
+_start:
+ ;; Initialize the stack pointer
+ ldui sp, #%hi16(__stack)
+ addui sp, sp, #%lo16(__stack)
+ or fp, sp, sp
+ ;; Zero the bss space
+ ldui r9, #%hi16(__bss_start)
+ addui r9, r9, #%lo16(__bss_start)
+ ldui r10, #%hi16(__bss_end)
+ addui r10, r10, #%lo16(__bss_end)
+ or r0, r0, r0
+ brle r10, r9, .Lnext1
+ or r0, r0, r0
+.Lcpy0:
+ stw r0, r9, #0
+ addi r9, r9, #4
+ or r0, r0, r0 ; nop
+ brle r9, r10, .Lcpy0
+ or r0, r0, r0 ; nop
+
+.Lnext1:
+ ;; Copy data from ROM to Frame Buffer (on-chip memory)
+ ldui r9, #%hi16(_fbdata_start)
+ ori r9, r9, #%lo16(_fbdata_start)
+ ldui r10, #%hi16(_fbdata_end)
+ ori r10, r10, #%lo16(_fbdata_end)
+ ldui r11, #%hi16(_fbdata_vma)
+ brle r10, r9, .Lnext2
+ ori r11, r11, #%lo16(_fbdata_vma)
+.Lcpy1:
+ ldw r5, r9, #$0
+ addi r9, r9, #$4
+ stw r5, r11, #$0
+ brlt r9, r10, .Lcpy1
+ addi r11, r11, #$4
+
+.Lnext2:
+ ;; Zero the frame buffer bss section
+ ldui r9, #%hi16(_fbbss_start)
+ ori r9, r9, #%lo16(_fbbss_start)
+ ldui r10, #%hi16(_fbbss_end)
+ ori r10, r10, #%lo16(_fbbss_end)
+ or r0, r0, r0
+ brle r10, r9, .Lnext3
+ or r0, r0, r0
+.Lcpy2:
+ stw r0, r9, #$0
+ addi r9, r9, #$4
+ or r0, r0, r0
+ brle r9, r10, .Lcpy2
+ or r0, r0, r0
+
+.Lnext3:
+ ;; Call global and static constructors
+ ldui r10, #%hi16(_init)
+ ori r10, r10, #%lo16(_init)
+ or r0, r0, r0 ; nop
+ jal r14, r10
+ or r0, r0, r0 ; nop
+
+ ;; Call main
+ ldui r10, #%hi16(main)
+ ori r10, r10, #%lo16(main)
+ or r0, r0, r0 ; nop
+ jal r14, r10
+ or r0, r0, r0 ; nop
+
+ ;; DJK - Added 12Nov01. Pass main's return value to exit.
+ or r1, r11, r0
+
+ ;; Jump to exit
+ ldui r10, #%hi16(exit)
+ ori r10, r10, #%lo16(exit)
+ or r0, r0, r0 ; nop
+ jal r14, r10
+ or r0, r0, r0 ; nop
+
+ ;; Exit does not return, however, this code is to catch an
+ ;; error if it does. Set the processor into sleep mode.
+ ori r1, r0, #$1
+ stw r1, r0, #%lo16(_DEBUG_HALT_REG)
+ or r0, r0, r0
+ or r0, r0, r0
+ or r0, r0, r0
+ or r0, r0, r0
+ or r0, r0, r0
+.Lend:
+ jmp .Lend
+ or r0, r0, r0