remove a.out

1 files changed, 33 insertions, 0 deletions

diff --git a/nasm/triangle.asm b/nasm/triangle.asm
new file mode 100644
index 0000000..a7a443d
--- /dev/null
+++ b/nasm/triangle.asm
@@ -0,0 +1,33 @@
+            global _start
+            section .text
+_start:
+            mov rdx, output         ; rdx holds next byte's address to write
+            mov r8,  1              ; initial line length
+            mov r9,  0              ; number of stars written to line so far
+_line:
+            mov byte [rdx], '*'     ; write single star to memory at given address in rdx
+            inc rdx                 ; increase rdx to next call to write
+            inc r9                  ; count number so far on line
+            cmp r9, r8              ; compare if stars number exceed line length
+            jne _line               ; loop if not yet exceed
+_linedone:
+            mov byte [rdx], 10      ; newline
+            inc rdx                 ; move rdx to next memory address
+            inc r8                  ; increase line length
+            mov r9, 0               ; reset stars number for new line
+            cmp r8, maxlines        ; compare if reached max line
+            jng _line               ; loop newline
+_done:
+            mov rax, 1              ; invoke system call for write
+            mov rdi, 1              ; file handler 1 is stdout
+            mov rsi, output         ; address of string to output
+            mov rdx, datasize       ; number of bytes
+            syscall                 ; invoke OS to write
+            mov rax, 60             ; invoke system call for exit
+            xor rdi, rdi            ; exit code 0
+            syscall                 ; invoke OS to exit
+
+            section .bss
+maxlines:   equ     8
+datasize:   equ     44
+output:     resb    datasize