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new image format for mips. Asm part

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phcoder 2009-10-18 14:10:31 +02:00
parent 8adc0f0060
commit ad17a401d6
5 changed files with 94 additions and 25 deletions
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5
conf/mips.rmk
View file

@ -26,7 +26,7 @@ kernel_syms.lst: $(addprefix include/grub/,$(kernel_img_HEADERS)) config.h genke
/bin/sh genkernsyms.sh $(filter %.h,$^) > $@ || (rm -f $@; exit 1)
# Programs
pkglib_PROGRAMS = kernel.img
pkglib_IMAGES = kernel.img
# Utilities.
sbin_UTILITIES = grub-mkdevicemap
@ -84,7 +84,7 @@ grub_emu_SOURCES = commands/minicmd.c commands/cat.c commands/cmp.c \
grub_emu_LDFLAGS = $(LIBCURSES)
kernel_img_SOURCES = kern/$(target_cpu)/$(target_machine)/startup.S \
kernel_img_SOURCES = kern/$(target_cpu)/startup.S \
kern/main.c kern/device.c kern/$(target_cpu)/$(target_machine)/init.c \
kern/disk.c kern/dl.c kern/err.c kern/file.c kern/fs.c \
kern/misc.c kern/mm.c kern/reader.c kern/term.c \
@ -97,6 +97,7 @@ kernel_img_CFLAGS = $(COMMON_CFLAGS)
kernel_img_ASFLAGS = $(COMMON_ASFLAGS)
kernel_img_LDFLAGS = $(COMMON_LDFLAGS) -static-libgcc -lgcc \
-Wl,-N,-S,-Ttext,$(LINK_BASE),-Bstatic
kernel_img_FORMAT = binary
# Scripts.
sbin_SCRIPTS =

2
configure.ac
View file

@ -64,6 +64,7 @@ if test "x$with_platform" = x; then
powerpc-*) platform=ieee1275 ;;
powerpc64-*) platform=ieee1275 ;;
sparc64-*) platform=ieee1275 ;;
mips-*) platform=yeeloong ;;
*) AC_MSG_ERROR([unsupported CPU: "$target_cpu"]) ;;
esac
else
@ -92,6 +93,7 @@ case "$target_cpu"-"$platform" in
sparc64-ieee1275) ;;
mips-qemu-r4k) ;;
mips-qemu-mipssim) ;;
mips-yeeloong) ;;
*) AC_MSG_ERROR([platform "$platform" is not supported for target CPU "$target_cpu"]) ;;
esac

2
genmk.rb
View file

@ -68,7 +68,7 @@ MOSTLYCLEAN_IMAGE_TARGETS += mostlyclean-image-#{@name}.#{@rule_count}
ifneq ($(TARGET_APPLE_CC),1)
#{@name}: #{exe}
$(OBJCOPY) -O $(#{prefix}_FORMAT) --strip-unneeded -R .note -R .comment -R .note.gnu.build-id $< $@
$(OBJCOPY) -O $(#{prefix}_FORMAT) --strip-unneeded -R .note -R .comment -R .note.gnu.build-id -R .reginfo -R .rel.dyn $< $@
else
ifneq (#{exe},kernel.exec)
#{@name}: #{exe} ./grub-macho2img

12
include/grub/mips/kernel.h
View file

@ -20,13 +20,15 @@
#define GRUB_KERNEL_CPU_HEADER 1
#define GRUB_MOD_ALIGN 0x1000
/* Non-zero value is only needed for PowerMacs. */
#define GRUB_MOD_GAP 0x0
/* Minimal gap between _end and the start of the modules. It's a hack
for PowerMac to prevent "CLAIM failed" error. The real fix is to
rewrite grub-mkimage to generate valid ELF files. */
#define GRUB_MOD_GAP 0x8000
#define GRUB_KERNEL_CPU_RAW_SIZE 0x100
#define GRUB_KERNEL_CPU_COMPRESSED_SIZE 0x8
#define GRUB_KERNEL_CPU_TOTAL_MODULE_SIZE 0xc
#define GRUB_KERNEL_CPU_KERNEL_IMAGE_SIZE 0x10
#define GRUB_KERNEL_CPU_PREFIX 0x8
#define GRUB_KERNEL_CPU_PREFIX 0x0
#define GRUB_KERNEL_CPU_DATA_END 0x48
#endif

98
kern/mips/startup.S
View file

@ -21,6 +21,8 @@
#include <grub/cpu/kernel.h>
#include <grub/machine/memory.h>
#define BASE_ADDR 8
.extern __bss_start
.extern _end
@ -28,8 +30,84 @@
__start:
_start:
start:
b codestart
. = _start + GRUB_KERNEL_CPU_PREFIX
bal codestart
. = _start + GRUB_KERNEL_CPU_COMPRESSED_SIZE
compressed_size:
.long 0
. = _start + GRUB_KERNEL_CPU_TOTAL_MODULE_SIZE
total_module_size:
.long 0
. = _start + GRUB_KERNEL_CPU_KERNEL_IMAGE_SIZE
kernel_image_size:
.long 0
codestart:
/* Decompress the payload. */
addiu $t2, $ra, GRUB_KERNEL_CPU_RAW_SIZE - BASE_ADDR
lui $t1, %hi(compressed)
addiu $t1, %lo(compressed)
lw $t3, (GRUB_KERNEL_CPU_COMPRESSED_SIZE - BASE_ADDR)($ra)
/* $t2 contains source compressed address, $t1 is destination,
$t3 is compressed size. FIXME: put LZMA here. Don't clober $ra
*/
reloccont:
lb $t4, 0($t2)
sb $t4, 0($t1)
addiu $t1,$t1,1
addiu $t2,$t2,1
addiu $t3, 0xffff
bne $t3, $0, reloccont
/* Move the modules out of BSS. */
lui $t1, %hi(compressed)
addiu $t1, %lo(compressed)
lw $t2, (GRUB_KERNEL_CPU_KERNEL_IMAGE_SIZE - BASE_ADDR)($ra)
addu $t2, $t1, $t2
lui $t1, %hi(_end)
addiu $t1, %lo(_end)
addiu $t1, (GRUB_MOD_ALIGN-1)
li $t3, (GRUB_MOD_ALIGN-1)
nor $t3, $t3, $0
and $t1, $t1, $t3
/* Pass modules address as first argument. */
move $a0, $t1
lw $t3, (GRUB_KERNEL_CPU_TOTAL_MODULE_SIZE - BASE_ADDR)($ra)
/* $t2 is source. $t1 is destination. $t3 is size. */
modulesmovcont:
lb $t4, 0($t2)
sb $t4, 0($t1)
addiu $t1,$t1,1
addiu $t2,$t2,1
addiu $t3, 0xffff
bne $t3, $0, modulesmovcont
/* Clean BSS. */
lui $t1, %hi(__bss_start)
addiu $t1, %lo(__bss_start)
lui $t2, %hi(_end)
addiu $t2, %lo(_end)
bsscont:
sb $0,0($t1)
addiu $t1,$t1,1
sltu $t3,$t1,$t2
bne $t3, $0, bsscont
li $sp, GRUB_MACHINE_MEMORY_STACK_HIGH
lui $t1, %hi(grub_main)
addiu $t1, %lo(grub_main)
#if __mips >= 2
sync
#endif
jr $t1
. = _start + GRUB_KERNEL_CPU_RAW_SIZE
compressed:
. = _start + GRUB_KERNEL_CPU_RAW_SIZE + GRUB_KERNEL_CPU_PREFIX
VARIABLE(grub_prefix)
/* to be filled by grub-mkelfimage */
@ -38,18 +116,4 @@ VARIABLE(grub_prefix)
* Leave some breathing room for the prefix.
*/
. = _start + GRUB_KERNEL_CPU_DATA_END
codestart:
lui $t1, %hi(__bss_start)
addiu $t1, %lo(__bss_start)
lui $t2, %hi(_end)
addiu $t2, %lo(_end)
bsscont:
sb $0,0($t1)
addiu $t1,$t1,1
sltu $t3,$t1,$t2
bne $3, $0, bsscont
li $sp, GRUB_MACHINE_MEMORY_STACK_HIGH
b grub_main
. = _start + GRUB_KERNEL_CPU_RAW_SIZE + GRUB_KERNEL_CPU_DATA_END