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Merge pull request #366 from antonblanchard/hello-world-bss

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Zero BSS in hello world test
fpu-init
Michael Neuling 2 years ago committed by GitHub
parent d3aff67fa7 ff442d1bdb
commit b82eea5933
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 181 additions and 153 deletions
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18
hello_world/head.S
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@ -60,11 +60,25 @@ _start:


.global boot_entry .global boot_entry
boot_entry: boot_entry:
LOAD_IMM64(%r10,__bss_start)
LOAD_IMM64(%r11,__bss_end)
subf %r11,%r10,%r11
addi %r11,%r11,63
srdi. %r11,%r11,6
beq 2f
mtctr %r11
1: dcbz 0,%r10
addi %r10,%r10,64
bdnz 1b

/* setup stack */ /* setup stack */
LOAD_IMM64(%r1, STACK_TOP - 0x100) 2: LOAD_IMM64(%r1,__stack_top)
li %r0,0
stdu %r0,-32(%r1)
LOAD_IMM64(%r12, main) LOAD_IMM64(%r12, main)
mtctr %r12, mtctr %r12
bctrl bctrl
attn // terminate on exit
b . b .


#define EXCEPTION(nr) \ #define EXCEPTION(nr) \

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hello_world/hello_world.bin
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hello_world/hello_world.elf
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292
hello_world/hello_world.hex
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22
hello_world/powerpc.lds
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@ -1,13 +1,27 @@
SECTIONS SECTIONS
{ {
_start = .;
. = 0; . = 0;
_start = .;
.head : { .head : {
KEEP(*(.head)) KEEP(*(.head))
} }
. = 0x1000; . = 0x1000;
.text : { *(.text) } .text : { *(.text) *(.text.*) *(.rodata) *(.rodata.*) }
. = 0x1800; . = 0x1800;
.data : { *(.data) } .data : { *(.data) *(.data.*) *(.got) *(.toc) }
.bss : { *(.bss) } . = ALIGN(0x80);
__bss_start = .;
.bss : {
*(.dynsbss)
*(.sbss)
*(.scommon)
*(.dynbss)
*(.bss)
*(.common)
*(.bss.*)
}
. = ALIGN(0x80);
__bss_end = .;
. = . + 0x2000;
__stack_top = .;
} }

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