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crt: Implement the indirect call helper ARM64EC adjustor thunk

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Calls to this are synthesized by the linker where it is used for calling
into import libraries, this is referred to as an 'Adjustor Thunk' in
ARM64EC documentation.

Signed-off-by: Jacek Caban <jacek@codeweavers.com>
This commit is contained in:
Billy Laws 2025-04-06 17:26:29 +02:00 committed by Jacek Caban
parent 8191d597be
commit a421d2c0c6
1 changed files with 23 additions and 0 deletions
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23
mingw-w64-crt/crt/chpe.S
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@ -83,3 +83,26 @@ EXPORT_SYM(__chpe_metadata)
.rva __os_arm64x_helper6
.rva __os_arm64x_helper7
.rva __os_arm64x_helper8
/*
* Calls to this are synthesized by the linker when calling into import libraries,
* this is referred to as an 'Adjustor Thunk' in ARM64EC documentation.
*/
.text
.balign 16
EXPORT_SYM(__icall_helper_arm64ec)
.seh_proc "__icall_helper_arm64ec"
stp fp, lr, [sp, #-16]!
.seh_save_fplr_x 16
mov fp, sp
.seh_set_fp
.seh_endprologue
adrp x16, __os_arm64x_check_icall
ldr x16, [x16, #:lo12:__os_arm64x_check_icall]
blr x16
.seh_startepilogue
ldp fp, lr, [sp], #16
.seh_save_fplr_x 16
.seh_endepilogue
br x11
.seh_endproc