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-rw-r--r--Makefile4
-rw-r--r--PL0_test.ld48
2 files changed, 11 insertions, 41 deletions
diff --git a/Makefile b/Makefile
index 68368a5..e48dd2d 100644
--- a/Makefile
+++ b/Makefile
@@ -21,8 +21,8 @@ all : kernel.img
%_embeddable.o : %.img
arm-none-eabi-objcopy -I binary -O elf32-littlearm -B arm --rename-section .data=.rodata $^ $@
-PL_0_test.elf : PL0_test.o uart.o
- arm-none-eabi-gcc -T PL0_test.ld -o $@ $(ELFFLAGS) $^
+PL_0_test.elf : PL0_test.ld PL0_test.o uart.o
+ arm-none-eabi-gcc -T $< -o $@ $(ELFFLAGS) PL0_test.o uart.o
kernel_stage1.o : kernel_stage1.S kernel_stage2.img
arm-none-eabi-as -mcpu=cortex-a7 $< -o $@
diff --git a/PL0_test.ld b/PL0_test.ld
index 45bee5e..b1d06f4 100644
--- a/PL0_test.ld
+++ b/PL0_test.ld
@@ -1,49 +1,19 @@
-ENTRY(_start)
-
+/* linker script for creating the example userspace program PL0_test
+ */
+
+/* no ENTRY() statement - this executable is run by jumping to it */
+
SECTIONS
{
- /* 0b10101010101000000000000000000000 */
+ /* my thought up address userspace programs should run from */
. = 0xaaa00000;
- /* For some reason ld warns when _start is not defined. */
- /* Other .elf files link ok - only PL0_test.elf seems to */
- /* expect _start to be deifned. */
- _start = .;
__start = .;
- __text_start = .;
- .text :
+ .another_weird_section_name_that_doesnt_matter :
{
/* have entry point at the beginning */
- KEEP(*(.text.PL0main))
- *(.text)
+ KEEP(PL0_test.o)
+ *(*)
}
- . = ALIGN(4096); /* align to page size */
- __text_end = .;
-
- __rodata_start = .;
- .rodata :
- {
- *(.rodata)
- }
- . = ALIGN(4096); /* align to page size */
- __rodata_end = .;
-
- __data_start = .;
- .data :
- {
- *(.data)
- }
- . = ALIGN(4096); /* align to page size */
- __data_end = .;
-
- __bss_start = .;
- .bss :
- {
- bss = .;
- *(.bss)
- }
- . = ALIGN(4096); /* align to page size */
- __bss_end = .;
- __bss_size = __bss_end - __bss_start;
__end = .;
}