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Diffstat (limited to 'libgloss/mt/crt0-64-001.S')
| -rw-r--r-- | libgloss/mt/crt0-64-001.S | 144 |
1 files changed, 0 insertions, 144 deletions
diff --git a/libgloss/mt/crt0-64-001.S b/libgloss/mt/crt0-64-001.S deleted file mode 100644 index b78e780..0000000 --- a/libgloss/mt/crt0-64-001.S +++ /dev/null @@ -1,144 +0,0 @@ -; crt0_2.s - Startup code for the mrisc1. This code initializes the C -; run-time model. -; -; 12Nov01 (DJK) - The return code from main was not being passed to exit(). -; Now it is passed as a parameter in R1. -; -; 10Sep01 (DJK) - The function exit() does not return. However, in the -; the case of device error (if the halt bit does not -; function properly, for instance), then a catch loop -; has been added. -; -; -; Copyright 2001, 2002, 2003, 2004 Morpho Technologies, Inc. -; - - ; Create a label for the start of the eh_frame section. - .section .eh_frame -__eh_frame_begin: - - .equ HALT_REG, 0x300 - .section .text - .global _start -_start: - ;; Initialize the stack pointer - ldui sp, #%hi16(__stack) - addui sp, sp, #%lo16(__stack) - or fp, sp, sp - - ;; 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(__FRAME_BUFFER_START) - brle r10, r9, .Lnext1 - ori r11, r11, #%lo16(__FRAME_BUFFER_START) -.Lcpy0: - ldw r5, r9, #$0 - addi r9, r9, #$4 - stw r5, r11, #$0 - brlt r9, r10, .Lcpy0 - addi r11, r11, #$4 - -.Lnext1: - ;; Copy data from ROM to External Memory (off-chip memory) - ldui r9, #%hi16(_extdata_start) - ori r9, r9, #%lo16(_extdata_start) - ldui r10, #%hi16(_extdata_end) - ori r10, r10, #%lo16(_extdata_end) - ldui r11, #%hi16(__EXTERNAL_MEMORY_START) - brle r10, r9, .Lnext2 - ori r11, r11, #%lo16(__EXTERNAL_MEMORY_START) -.Lcpy1: - ldw r5, r9, #$0 - addi r9, r9, #$4 - stw r5, r11, #$0 - brlt r9, r10, .Lcpy1 - addi r11, r11, #$4 - - -.Lnext2: - ;; 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, .Lnext3 - or r0, r0, r0 -.Lcpy2: - stw r0, r9, #0 - addi r9, r9, #4 - or r0, r0, r0 ; nop - brle r9, r10, .Lcpy2 - or r0, r0, r0 ; nop - -.Lnext3: - ;; Zero the external memory bss section - ldui r9, #%hi16(_extbss_start) - ori r9, r9, #%lo16(_extbss_start) - ldui r10, #%hi16(_extbss_end) - ori r10, r10, #%lo16(_extbss_end) - or r0, r0, r0 - brle r10, r9, .Lnext4 - or r0, r0, r0 -.Lcpy3: - stw r0, r9, #$0 - addi r9, r9, #$4 - or r0, r0, r0 - brle r9, r10, .Lcpy3 - or r0, r0, r0 - -.Lnext4: - ;; 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 - - ;; Setup destructors to be called from exit. - ;; (Just in case main never returns....) - ldui r10, #%hi16(atexit) - ori r10, r10, #%lo16(atexit) - ldui r1, #%hi16(_fini) - ori r1, r1, #%lo16(_fini) - or r0, r0, r0 ; nop - jal r14, r10 - or r0, r0, r0 ; nop - - ;; Initialise argc, argv and envp to empty - addi r1, r0, #0 - addi r2, r0, #0 - addi r3, r0, #0 - - ;; 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, #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 |