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[build] Warn on zero-length symbols when building symbol table

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Make build_symbol_table.py output statistics on the symbol table it
builds, and emit warnings for zero-length symbols. Also added lengths to
several functions defined in asm that this uncovered.
This commit is contained in:
Justin C. Miller
2023-02-06 00:37:26 -08:00
parent ab31825ab3
commit 8966380ef9
6 changed files with 51 additions and 21 deletions
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18
src/kernel/debug.s
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@@ -1,33 +1,39 @@
global get_rsp: function hidden
global get_rsp: function hidden (get_rsp.end - get_rsp)
get_rsp:
mov rax, rsp
ret
.end:
global get_rip: function hidden
global get_rip: function hidden (get_rip.end - get_rip)
get_rip:
pop rax ; do the same thing as 'ret', except with 'jmp'
jmp rax ; with the return address still in rax
.end:
global get_caller: function hidden
global get_caller: function hidden (get_caller.end - get_caller)
get_caller:
; No prelude - don't touch rsp or rbp
mov rax, [rbp+8]
ret
.end:
global get_grandcaller: function hidden
global get_grandcaller: function hidden (get_grandcaller.end - get_grandcaller)
get_grandcaller:
; No prelude - don't touch rsp or rbp
mov rax, [rbp]
mov rax, [rax+8]
ret
.end:
global get_gsbase: function hidden
global get_gsbase: function hidden (get_gsbase.end - get_gsbase)
get_gsbase:
rdgsbase rax
ret
.end:
global _halt: function hidden
global _halt: function hidden (_halt.end - _halt)
_halt:
hlt
jmp _halt
.end: