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Lecture Computer organization and assembly language - Lecture 19: I/O and Conditional Jumps in Assembly

In this lecture, students will be able to understand: Assembly Language Implementation, Conditional Jump Instructions: Jumps Based on Specific Flags; JZ, JNZ, JC, JNC, Jumps Based on Equality; JE, JNE, JCXZ, Jumps Based on Unsigned Comparison; JA, JB, JAE, JBE, Jumps Based on Signed Comparison; JG, JL, JGE, JLE,. | CSC 221 Computer Organization and Assembly Language Lecture 19: I/O and Conditional Jumps in Assembly Lecture 18: Review I/O Instructions StdIn proc lpszBuffer:DWORD,bLen:DWORD Description StdIn receives text input from the console and places it in the buffer required as a parameter. The function terminates when Enter is pressed. Parameters 1. lpszBuffer The buffer to receive the text input from the console. 2. bLen The length of the buffer. Source: C:\masm32\help\masmlib.chm Include \masm32\include\masm32.inc includelib \masm32\lib\masm32.lib invoke StdIn, addr buffer, 100 Program Components Lecture 18: Review StdOut proc lpszText:DWORD Description: StdOut will display a zero terminated string at the current position in the console. Parameter lpszText : A zero terminates string. Return Value There is no return value. Source: C:\masm32\help\masmlib.chm (cont.) Include \masm32\include\masm32.inc includelib \masm32\lib\masm32.lib invoke StdOut, addr message1 I/O Instructions: . | CSC 221 Computer Organization and Assembly Language Lecture 19: I/O and Conditional Jumps in Assembly Lecture 18: Review I/O Instructions StdIn proc lpszBuffer:DWORD,bLen:DWORD Description StdIn receives text input from the console and places it in the buffer required as a parameter. The function terminates when Enter is pressed. Parameters 1. lpszBuffer The buffer to receive the text input from the console. 2. bLen The length of the buffer. Source: C:\masm32\help\masmlib.chm Include \masm32\include\masm32.inc includelib \masm32\lib\masm32.lib invoke StdIn, addr buffer, 100 Program Components Lecture 18: Review StdOut proc lpszText:DWORD Description: StdOut will display a zero terminated string at the current position in the console. Parameter lpszText : A zero terminates string. Return Value There is no return value. Source: C:\masm32\help\masmlib.chm (cont.) Include \masm32\include\masm32.inc includelib \masm32\lib\masm32.lib invoke StdOut, addr message1 I/O Instructions: Example .data message1 BYTE "Type your name: ", 0 message2 BYTE "Your name is ", 0 .data? buffer BYTE 100 dup(?) .code start: invoke StdOut, addr message1 invoke StdIn, addr buffer, 100 invoke StdOut, addr message2 invoke StdOut, addr buffer invoke StdIn, addr buffer, 100 invoke ExitProcess, 0 end start Conditional Jump (Jcond) Instructions A conditional jump instruction branches to a label when specific register or flag conditions are met. Examples: JB, JC jump to a label if the Carry flag is set JE, JZ jump to a label if the Zero flag is set JS jumps to a label if the Sign flag is set JNE, JNZ jump to a label if the Zero flag is clear JECXZ jumps to a label if ECX equals 0 Jcond Ranges Prior to the 386: jump must be within –128 to +127 bytes from current location counter. IA-32 processors: 32-bit offset permits jump anywhere in memory. Jumps Based on Specific Flags Jumps Based on Equality Jumps Based on Unsigned Comparisons Jumps Based on Signed Comparisons Lecture Outline ASSEMBLY .