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EMILE/second/head.S

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Initial revision
2004-02-15 20:46:45 +00:00
/*
*
Update email address Signed-off-by: Laurent Vivier <Laurent@Vivier.EU>
2013-09-05 12:39:22 +00:00
* (c) 2004, 2005 Laurent Vivier <Laurent@Vivier.EU>
Initial revision
2004-02-15 20:46:45 +00:00
*
*/
include ../first/macos.i, for APPLE_DRIVER, manage 32bitmode and boot unit
2008-08-12 13:54:55 +00:00
.include "../first/macos.i"
check result of NewPtr and invoke SysError if needed
2004-08-18 23:14:55 +00:00
include ../first/macos.i, for APPLE_DRIVER, manage 32bitmode and boot unit
2008-08-12 13:54:55 +00:00
#if defined(APPLE_DRIVER)
.include "../first/32bitmode.i"
#endif
Allocate and relocate section BSS
2004-05-25 20:12:52 +00:00
EM06 header type: all is stored as text
2005-11-27 22:31:07 +00:00
.equ paramstring_length, 1024
Allow to set kernel command line
2004-05-19 00:09:58 +00:00
Enhance second stage header
2004-05-26 23:05:35 +00:00
/***************************************************************************
*
* second level arguments
*
***************************************************************************/
Add serial configuration information in header
2004-06-22 21:24:54 +00:00
_start: bra setup
include ../first/macos.i, for APPLE_DRIVER, manage 32bitmode and boot unit
2008-08-12 13:54:55 +00:00
change signature to EM07 to support config file
2007-05-12 19:33:25 +00:00
_signature: .dc.b 'E','M','0','7'
switch to EM04, add scsi support -> kernel_image_offset is container offset
2004-12-03 00:21:25 +00:00
EM06 header type: all is stored as text
2005-11-27 22:31:07 +00:00
/* EM06 */
switch to EM04, add scsi support -> kernel_image_offset is container offset
2004-12-03 00:21:25 +00:00
EM06 header type: all is stored as text
2005-11-27 22:31:07 +00:00
_conf_size: .dc.w paramstring_length
_configuration: .skip paramstring_length, 0
Allow to set kernel command line
2004-05-19 00:09:58 +00:00
.align 4
setup:
include ../first/macos.i, for APPLE_DRIVER, manage 32bitmode and boot unit
2008-08-12 13:54:55 +00:00
#if defined(APPLE_DRIVER)
lea boot_unit(%pc), %a0
move.l %d5, (%a0)
switch32bitmode
#endif
Allocate and relocate section BSS
2004-05-25 20:12:52 +00:00
/* relocate C code, need to be compiled with -fpic */
Make second level relocatable using -fpic and "GLOBAL_OFFSET_TABLE" should be improved by using -mrelpc, but this flags is only supported by gcc > 3.0 (and I use gcc 2.95)
2004-05-24 23:59:13 +00:00
bsr relocate
Initial revision
2004-02-15 20:46:45 +00:00
/* begin to work */
Add serial configuration information in header
2004-06-22 21:24:54 +00:00
lea _start(%pc), %a0
Pass booter info by args of start()
2004-06-03 19:30:26 +00:00
move.l %a0, -(%sp)
bsr start@PLTPC
Initial revision
2004-02-15 20:46:45 +00:00
/* We guess to never come here */
loop:
bra loop
Make second level relocatable using -fpic and "GLOBAL_OFFSET_TABLE" should be improved by using -mrelpc, but this flags is only supported by gcc > 3.0 (and I use gcc 2.95)
2004-05-24 23:59:13 +00:00
relocate:
Allocate and relocate section BSS
2004-05-25 20:12:52 +00:00
/* Allocate BSS section */
move.l #__bss_size, %d0 /* size */
GCC 3 requires BSS be cleared: it places variables initialized to 0 from DATA to BSS
2005-06-06 19:33:40 +00:00
/* Alloc and clear memory (needed by GCC 3) */
NewPtrClear /* result in %a0 */
check result of NewPtr and invoke SysError if needed
2004-08-18 23:14:55 +00:00
move.l %a0, %d0
bne malloc_ok
SysError
malloc_ok:
Allocate and relocate section BSS
2004-05-25 20:12:52 +00:00
move.l %a0,%d3
move.l #__bss_start, %d0
sub.l %d0,%d3 /* %d3 is the offset to add for BSS */
Make second level relocatable using -fpic and "GLOBAL_OFFSET_TABLE" should be improved by using -mrelpc, but this flags is only supported by gcc > 3.0 (and I use gcc 2.95)
2004-05-24 23:59:13 +00:00
/* real address of GOT */
68000 compatibility: load _GLOBAL_OFFSET_TABLE_
2005-06-10 20:53:14 +00:00
lea _GLOBAL_OFFSET_TABLE_-.-8,%a0
lea (%pc, %a0), %a0
Make second level relocatable using -fpic and "GLOBAL_OFFSET_TABLE" should be improved by using -mrelpc, but this flags is only supported by gcc > 3.0 (and I use gcc 2.95)
2004-05-24 23:59:13 +00:00
/* linked address of GOT */
move.l #_GLOBAL_OFFSET_TABLE_, %d0
Allocate and relocate section BSS
2004-05-25 20:12:52 +00:00
/* %d2 is the offset to add for all other sections */
Make second level relocatable using -fpic and "GLOBAL_OFFSET_TABLE" should be improved by using -mrelpc, but this flags is only supported by gcc > 3.0 (and I use gcc 2.95)
2004-05-24 23:59:13 +00:00
move.l %a0,%d2
sub.l %d0,%d2
Allocate and relocate section BSS
2004-05-25 20:12:52 +00:00
/* relocate BSS section */
move.l #__got_size, %d0
Make second level relocatable using -fpic and "GLOBAL_OFFSET_TABLE" should be improved by using -mrelpc, but this flags is only supported by gcc > 3.0 (and I use gcc 2.95)
2004-05-24 23:59:13 +00:00
beq exit_relocate
got_loop:
move.l (%a0), %d1
Allocate and relocate section BSS
2004-05-25 20:12:52 +00:00
arch_init must be before init_memory_map, console_init can be the first call
2004-05-25 23:16:56 +00:00
cmp.l #__bss_start.l, %d1
Allocate and relocate section BSS
2004-05-25 20:12:52 +00:00
blt other_section
arch_init must be before init_memory_map, console_init can be the first call
2004-05-25 23:16:56 +00:00
cmp.l #_end.l, %d1
Allocate and relocate section BSS
2004-05-25 20:12:52 +00:00
bgt other_section
/* symbol in section BSS */
add.l %d3, %d1
bra got_store
other_section:
Make second level relocatable using -fpic and "GLOBAL_OFFSET_TABLE" should be improved by using -mrelpc, but this flags is only supported by gcc > 3.0 (and I use gcc 2.95)
2004-05-24 23:59:13 +00:00
add.l %d2, %d1
Allocate and relocate section BSS
2004-05-25 20:12:52 +00:00
got_store:
Make second level relocatable using -fpic and "GLOBAL_OFFSET_TABLE" should be improved by using -mrelpc, but this flags is only supported by gcc > 3.0 (and I use gcc 2.95)
2004-05-24 23:59:13 +00:00
move.l %d1, (%a0)+
Allocate and relocate section BSS
2004-05-25 20:12:52 +00:00
Make second level relocatable using -fpic and "GLOBAL_OFFSET_TABLE" should be improved by using -mrelpc, but this flags is only supported by gcc > 3.0 (and I use gcc 2.95)
2004-05-24 23:59:13 +00:00
subq.l #4, %d0
bgt got_loop
exit_relocate:
rts
include ../first/macos.i, for APPLE_DRIVER, manage 32bitmode and boot unit
2008-08-12 13:54:55 +00:00
#if defined(APPLE_DRIVER)
PRAM_buffer:
.long 0
.globl boot_unit
boot_unit:
.long 0
#endif
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