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Allocate and relocate section BSS

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This commit is contained in:
Laurent Vivier 2004-05-25 20:12:52 +00:00
parent cf8d13a76f
commit 8b4036e0f5
2 changed files with 38 additions and 16 deletions
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51
second/head.S
View File

@ -4,6 +4,10 @@
* *
*/ */
.macro NewPtr
.short 0xA11E
.endm
.equ cmdline_length, 256 /* see CL_SIZE in bootinfo.c */ .equ cmdline_length, 256 /* see CL_SIZE in bootinfo.c */
.global _start .global _start
@ -18,10 +22,14 @@ _command_line:
.align 4 .align 4
setup: setup:
/* relocate C code, need to be compile with -fpic */ /* relocate C code, need to be compiled with -fpic */
bsr relocate bsr relocate
/* memory map */
bsr init_memory_map@PLTPC
/* identify system */ /* identify system */
bsr arch_init@PLTPC bsr arch_init@PLTPC
@ -30,21 +38,10 @@ setup:
bsr console_init@PLTPC bsr console_init@PLTPC
/* initialize memory, so we can work */
bsr memory_init@PLTPC
/* retrieve machine info */ /* retrieve machine info */
bsr bootinfo_init@PLTPC bsr bootinfo_init@PLTPC
/* allocate stack, so we can jump */
pea 0x2000
bsr malloc@PLTPC
add.l #0x2000 - 16, %d0
move.l %d0, %sp
/* begin to work */ /* begin to work */
bsr main@PLTPC bsr main@PLTPC
@ -54,6 +51,14 @@ loop:
bra loop bra loop
relocate: relocate:
/* Allocate BSS section */
move.l #__bss_size, %d0 /* size */
NewPtr /* result in %a0 */
move.l %a0,%d3
move.l #__bss_start, %d0
sub.l %d0,%d3 /* %d3 is the offset to add for BSS */
/* real address of GOT */ /* real address of GOT */
lea (%pc, _GLOBAL_OFFSET_TABLE_@GOTPC), %a0 lea (%pc, _GLOBAL_OFFSET_TABLE_@GOTPC), %a0
@ -62,19 +67,35 @@ relocate:
move.l #_GLOBAL_OFFSET_TABLE_, %d0 move.l #_GLOBAL_OFFSET_TABLE_, %d0
/* offset to add to GOT items */ /* %d2 is the offset to add for all other sections */
move.l %a0,%d2 move.l %a0,%d2
sub.l %d0,%d2 sub.l %d0,%d2
beq exit_relocate
move.l #_GOT_SIZE, %d0 /* relocate BSS section */
move.l #__got_size, %d0
beq exit_relocate beq exit_relocate
got_loop: got_loop:
move.l (%a0), %d1 move.l (%a0), %d1
cmp.l #__bss_start, %d1
blt other_section
cmp.l #_end, %d1
bgt other_section
/* symbol in section BSS */
add.l %d3, %d1
bra got_store
other_section:
add.l %d2, %d1 add.l %d2, %d1
got_store:
move.l %d1, (%a0)+ move.l %d1, (%a0)+
subq.l #4, %d0 subq.l #4, %d0
bgt got_loop bgt got_loop

3
second/ld.script
View File

@ -82,7 +82,7 @@ SECTIONS
.gcc_except_table : { *(.gcc_except_table) } .gcc_except_table : { *(.gcc_except_table) }
.dynamic : { *(.dynamic) } .dynamic : { *(.dynamic) }
.got : { *(.got.plt) *(.got) } .got : { *(.got.plt) *(.got) }
_GOT_SIZE = . - _GLOBAL_OFFSET_TABLE_; __got_size = . - _GLOBAL_OFFSET_TABLE_;
_edata = .; _edata = .;
PROVIDE (edata = .); PROVIDE (edata = .);
__bss_start = .; __bss_start = .;
@ -94,6 +94,7 @@ SECTIONS
. = ALIGN(32 / 8); . = ALIGN(32 / 8);
} }
. = ALIGN(32 / 8); . = ALIGN(32 / 8);
__bss_size = . - __bss_start;
_end = .; _end = .;
__bootloader_end = .; __bootloader_end = .;
PROVIDE (end = .); PROVIDE (end = .);