mirror of
https://github.com/fergalmoran/ladybird.git
synced 2026-01-06 08:36:15 +00:00
beb55f726f
This commit lets us differentiate whether access faults are caused by accessing junk memory addresses given to us by userspace or if we hit a kernel bug. The stub implementations of the `safe_*` functions currently don't let us jump back into them and return a value indicating failure, so we panic if such a fault happens. Practically, this means that we still crash, but if the access violation was caused by something else, we take the usual kernel crash code path and print a register and memory dump, rather than hitting the `TODO_AARCH64` in `handle_safe_access_fault`.
94 lines
2.0 KiB
Plaintext
94 lines
2.0 KiB
Plaintext
ENTRY(start)
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KERNEL_MAPPING_BASE = 0x2000000000;
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/* TODO: Add FLAGS to the program headers */
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PHDRS
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{
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text PT_LOAD ;
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data PT_LOAD ;
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ksyms PT_LOAD ;
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bss PT_LOAD ;
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}
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SECTIONS
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{
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. = KERNEL_MAPPING_BASE + 0x80000;
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start_of_kernel_image = .;
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.text ALIGN(4K) : AT (ADDR(.text) - KERNEL_MAPPING_BASE)
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{
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*(.text.first)
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start_of_safemem_text = .;
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KEEP(*(.text.safemem))
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end_of_safemem_text = .;
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start_of_safemem_atomic_text = .;
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KEEP(*(.text.safemem.atomic))
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end_of_safemem_atomic_text = .;
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*(.text*)
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} :text
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.rodata ALIGN(4K) : AT (ADDR(.rodata) - KERNEL_MAPPING_BASE)
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{
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start_heap_ctors = .;
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*libkernel_heap.a:*(.init_array)
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end_heap_ctors = .;
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start_ctors = .;
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*(.init_array)
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end_ctors = .;
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*(.rodata*)
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} :data
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.data ALIGN(4K) : AT (ADDR(.data) - KERNEL_MAPPING_BASE)
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{
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*(.data*)
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} :data
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.ksyms ALIGN(4K) : AT (ADDR(.ksyms) - KERNEL_MAPPING_BASE)
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{
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start_of_kernel_ksyms = .;
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*(.kernel_symbols)
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end_of_kernel_ksyms = .;
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} :ksyms
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.bss ALIGN(4K) (NOLOAD) : AT (ADDR(.bss) - KERNEL_MAPPING_BASE)
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{
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start_of_bss = .;
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*(.bss)
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end_of_bss = .;
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. = ALIGN(4K);
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*(.heap)
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} :bss
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/*
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FIXME: 8MB is enough space for all of the tables required to identity map
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physical memory. 8M is wasteful, so this should be properly calculated.
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*/
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/* FIXME: Placeholder to satisfy linker */
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start_of_kernel_text = .;
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end_of_kernel_text = .;
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start_of_unmap_after_init = .;
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end_of_unmap_after_init = .;
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start_of_ro_after_init = .;
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end_of_ro_after_init = .;
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start_of_kernel_data = .;
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end_of_kernel_data = .;
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. = ALIGN(4K);
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page_tables_phys_start = .;
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. += 8M;
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page_tables_phys_end = .;
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end_of_kernel_image = .;
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}
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size_of_bss_divided_by_8 = (end_of_bss - start_of_bss + 7) / 8;
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