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https://github.com/vsariola/sointu.git
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51 lines
2.0 KiB
NASM
51 lines
2.0 KiB
NASM
{{- if .SupportsParamValue "oscillator" "type" .Sample}}
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{{- if eq .OS "windows"}}
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{{.ExportFunc "su_load_gmdls"}}
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{{- if .Amd64}}
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extern OpenFile ; requires windows
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extern ReadFile ; requires windows
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; Win64 ABI: RCX, RDX, R8, and R9
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sub rsp, 40 ; Win64 ABI requires "shadow space" + space for one parameter.
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mov rdx, qword su_sample_table
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mov rcx, qword su_gmdls_path1
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xor r8,r8 ; OF_READ
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push rdx ; &ofstruct, blatantly reuse the sample table
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push rcx
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call OpenFile ; eax = OpenFile(path,&ofstruct,OF_READ)
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pop rcx
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pop rdx
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movsxd rcx, eax
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mov qword [rsp+32], 0
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mov r9, rdx
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mov r8d, 3440660 ; number of bytes to read
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call ReadFile ; Readfile(handle,&su_sample_table,SAMPLE_TABLE_SIZE,&bytes_read,NULL)
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add rsp, 40 ; shadow space, as required by Win64 ABI
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ret
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{{else}}
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mov ebx, su_sample_table
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push 0 ; OF_READ
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push ebx ; &ofstruct, blatantly reuse the sample table
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push su_gmdls_path1 ; path
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call dword [__imp__OpenFile@12]; eax = OpenFile(path,&ofstruct,OF_READ) // should not touch ebx according to calling convention
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push 0 ; NULL
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push ebx ; &bytes_read, reusing sample table again; it does not matter that the first four bytes are trashed
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push 3440660 ; number of bytes to read
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push ebx ; here we actually pass the sample table to readfile
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push eax ; handle to file
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call dword [__imp__ReadFile@20] ; Readfile(handle,&su_sample_table,SAMPLE_TABLE_SIZE,&bytes_read,NULL)
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ret
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extern __imp__OpenFile@12 ; requires windows
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extern __imp__ReadFile@20
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; requires windows
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{{end}}
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{{.Data "su_gmdls_path1"}}
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db 'drivers/gm.dls',0
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{{end}}
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{{.SectBss "susamtable"}}
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su_sample_table:
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resb 3440660 ; size of gmdls.
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{{end}}
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