Zero BSS in hello world test

While trying to reduce U/X state issues, I notice that our BSS is not
being initialised in the hello world test.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
fpu-init
Anton Blanchard 2 years ago committed by Anton Blanchard
parent ebdddcc402
commit ff442d1bdb

@ -60,11 +60,25 @@ _start:

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

#define EXCEPTION(nr) \

Binary file not shown.

Binary file not shown.

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

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