From: Anton Blanchard Date: Wed, 8 Jun 2022 05:20:07 +0000 (+1000) Subject: Zero BSS in hello world test X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=ff442d1bdb16edb460dafb17687022d7dd8d92f7;p=microwatt.git 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 --- diff --git a/hello_world/head.S b/hello_world/head.S index 6357606..15f3494 100644 --- a/hello_world/head.S +++ b/hello_world/head.S @@ -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) \ diff --git a/hello_world/hello_world.bin b/hello_world/hello_world.bin index e4b14ca..a4eb88c 100755 Binary files a/hello_world/hello_world.bin and b/hello_world/hello_world.bin differ diff --git a/hello_world/hello_world.elf b/hello_world/hello_world.elf index 5eeedc4..3dc0cc1 100755 Binary files a/hello_world/hello_world.elf and 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+0000000000000068 +0000000000000000 0000000000000000 0000000000000000 0000000000000000 diff --git a/hello_world/powerpc.lds b/hello_world/powerpc.lds index 96bc6b9..1e218c7 100644 --- a/hello_world/powerpc.lds +++ b/hello_world/powerpc.lds @@ -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 = .; }