Factor non-linux parts out

1 files changed, 75 insertions, 0 deletions

diff --git a/pasmgen-linux.asm b/pasmgen-linux.asm
new file mode 100644
index 0000000..56113e6
--- /dev/null
+++ b/pasmgen-linux.asm
@@ -0,0 +1,75 @@
+format ELF64 executable
+
+segment readable executable
+
+main:
+	;; No arg preload case
+	cmp [rsp], word 1
+	jne argparse
+
+	mov r8, qword 3
+	mov r9, qword 2
+	mov r10, qword 3
+
+	jmp generate
+
+argparse:
+	;; Check args (need 3)
+	cmp [rsp], word 3
+	jle fail
+
+	;; load arg1
+	mov r8, [rsp+16]
+	mov r8, [r8]
+	and r8, 0xFF
+	sub r8, 48
+
+	;; load arg2
+	mov r9, [rsp+24]
+	mov r9, [r9]
+	and r9, 0xFF
+	sub r9, 48
+
+	;; load arg3
+	mov r10, [rsp+32]
+	mov r10, [r10]
+	and r10, 0xFF
+	sub r10, 48
+
+	jmp generate
+
+ok:
+	;; Write
+	mov rdi, 1  ;; stdout
+	mov rdx, rsi
+	mov rsi, out_buf
+	mov rax, 0x01
+	syscall
+
+	;; Exit (code 0)
+	mov rdi, 0
+	mov rax, 0x3c
+	syscall
+
+fail:
+	;; Write
+	mov rdi, 1  ;; stdout
+	mov rsi, usage
+	mov rdx, usage_len
+	mov rax, 0x01
+	syscall
+
+	;; Exit 1
+	mov rdi, 1
+	mov rax, 0x3c
+	syscall
+
+
+include 'pasmgen.inc'
+
+
+segment readable writeable
+
+include 'constants.inc'
+
+out_buf rb 64