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# Dump a stack trace when you abort.
== code
abort: # e: (addr array byte)
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
#
(set-cursor-position-on-real-screen 0 0)
(draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 *(ebp+8) 0xf 0xc) # 0/real-screen, 0xf/fg=white, 0xc/bg=red
(dump-call-stack)
# crash
{
eb/jump loop/disp8
}
# destroys the heap
dump-call-stack:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
50/push-eax
51/push-ecx
52/push-edx
53/push-ebx
# var labels/edx: (stream {label-name, address} 0x1000)
81 5/subop/subtract %esp 0xc000/imm32
68/push 0xc000/imm32
68/push 0/imm32/read
68/push 0/imm32/write
89/<- %edx 4/r32/esp
#
(load-debug-symbols %edx) # destroys the heap
# traverse the linked list of ebp pointers: https://wiki.osdev.org/Stack_Trace
8b/-> *ebp 3/r32/ebx
{
# loop termination check
81 7/subop/compare %ebx 0/imm32
0f 84/jump-if-= break/disp32
# loop body
(draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 "\n" 0 0xc)
(draw-int32-hex-wrapping-right-then-down-from-cursor-over-full-screen 0 *(ebx+4) 0xf 0xc)
# loop update
8b/-> *ebx 3/r32/ebx
#
e9/jump loop/disp32
}
$dump-call-stack:end:
# . reclaim locals
81 0/subop/add %esp 0x100c/imm32
# . restore registers
5b/pop-to-ebx
5a/pop-to-edx
59/pop-to-ecx
58/pop-to-eax
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
load-debug-symbols: # labels/edx: (stream {label-name, address})
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
50/push-eax
51/push-ecx
52/push-edx
53/push-ebx
# create space for a stream on the heap, clobbering any existing data
# var ecx: (addr stream byte)
b9/copy-to-ecx 0x03000000/imm32
c7 0/subop/copy *ecx 0/imm32 # write index
c7 0/subop/copy *(ecx+4) 0/imm32 # read index
c7 0/subop/copy *(ecx+8) 0x01000000/imm32 # stream capacity = 16MB
# load 0x100 sectors starting from sector 10080 = 0x2760
(load-sectors Primary-bus-primary-drive 0x2760 0x100 %ecx)
b8/copy-to-eax 0x0300000c/imm32
b9/copy-to-ecx 0/imm32
{
3d/compare-eax-and 0x030000ff/imm32
74/jump-if-= break/disp8
#
8a/byte-> *eax 1/r32/CL
(draw-grapheme-at-cursor 0 %ecx 7 0)
(move-cursor-rightward-and-downward 0)
#
40/increment-eax
eb/jump loop/disp8
}
$load-debug-symbols:end:
# . reclaim locals
81 0/subop/add %esp 0x100c/imm32
# . restore registers
5b/pop-to-ebx
5a/pop-to-edx
59/pop-to-ecx
58/pop-to-eax
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
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