From 437b37306ec441823d401fe64fbf99936754b206 Mon Sep 17 00:00:00 2001 From: johannst Date: Tue, 29 Sep 2020 19:25:07 +0000 Subject: deploy: 871f1a6f408a9b50182c8688d4aeec26bd6b2d93 --- arch/x86_64.html | 36 +++++++++++++++++++++++++++++++----- 1 file changed, 31 insertions(+), 5 deletions(-) (limited to 'arch/x86_64.html') diff --git a/arch/x86_64.html b/arch/x86_64.html index 26679a1..19a9f09 100644 --- a/arch/x86_64.html +++ b/arch/x86_64.html @@ -81,7 +81,7 @@ @@ -203,7 +203,7 @@ movw rax, [rbx+4*rcx] // load val at [rbx+4*rcx] into rax

Size directives

Explicitly specify size of the operation.

-
mov  byte ptr [rax], 0xff    // save 1 byte(s) at [rax]
+
mov  byte ptr [rax], 0xff    // save 1 byte(s) at [rax]
 mov  word ptr [rax], 0xff    // save 2 byte(s) at [rax]
 mov dword ptr [rax], 0xff    // save 4 byte(s) at [rax]
 mov qword ptr [rax], 0xff    // save 8 byte(s) at [rax]
@@ -227,7 +227,7 @@ r9        6
 -----------
 xmm0      1
   ..     ..
-xmm7      7
+xmm7      8
 

 
 
  • Additional arguments are passed on the stack. Arguments are pushed
@@ -274,7 +274,7 @@ must must save these registers in case they are used.
    
 
      
 
    • grows downwards
      • 
 
    • frames aligned on 16 byte boundary
-
      HI ADDR
+
      Hi ADDR
  |                +------------+
  |                | prev frame |
  |                +------------+ <--- 16 byte aligned (X & ~0xf)
@@ -283,10 +283,26 @@ must must save these registers in case they are used.
      
  |       [rbp-8]  | func stack |
  |                | ...        |
  v                +------------+
-LO ADDR
+Lo ADDR
 
      
 
      • 
 
    
+
    Function prologue & epilogue
    
+
      
+
    • prologue
+
      push rbp        // save caller base pointer
+mov rbp, rsp    // save caller stack pointer
+
      
+
      • 
+
    • epilogue
+
      mov rsp, rbp    // restore caller stack pointer
+pop rbp         // restore caller base pointer
+
      
+
      
+
      Equivalent to leave instruction.
      
+
      
+
      • 
+
    
 
    ASM skeleton
    
 
    Small assembler skeleton, ready to use with following properties:
    
 
 
                     
@@ -348,6 +366,10 @@ Hi ASM-World!
                         
 
                         
+                            
+                        
 
                         
    
                     
@@ -362,6 +384,10 @@ Hi ASM-World!
                 
 
                 
+                    
+                
             
 
         
-- 
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