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[libj6] Allow driver_main instead of main for accepting extra arguments

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Clang will complain if main() is not declared with 0, 2, or 3 arguments.
In order to allow an extra 4th parameter, a new weak main() symbol which
just jumps to driver_main is defined, and _start passes the extra init
pointer to main.

Additionally, libc's crt0.s _start is made weak, and a matching
_libc_crt0_start symbol is defined for implementations that wish to
override _start but still call libc's _start. (Will be used by init.)
This commit is contained in:
Justin C. Miller
2023-02-20 11:05:53 -08:00
parent abe7fe37d0
commit c092e07832
7 changed files with 17 additions and 12 deletions
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5
src/libraries/libc/arch/amd64/crt/crt0.s
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@@ -3,8 +3,11 @@ extern exit
extern __init_libj6
extern __init_libc
global _start:function (_start.end - _start)
global _start:function weak (_libc_crt0_start.end - _libc_crt0_start)
global _libc_crt0_start:function (_libc_crt0_start.end - _libc_crt0_start)
_start:
_libc_crt0_start:
push 0 ; Add null frame
push 0
mov rbp, rsp