prog

content/blog/x86_64_cheatsheet.md

@@ -9,9 +9,38 @@ categories = ["asm", "nasm", "x86_64"]
 
 Here is a post I will probably update as I learn more x86_64 assembly.
 
+# AMD64 ABI Reference
+
+From left to right, pass as many parameters as will fit in registers. The order in which registers are allocated, are:
+
+- For non-floats: rdi, rsi, rdx, rcx, r8, r9.
+- For floating-point: xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7.
+- Callee saved: rsp, rbx, rbp, r12-r15
+- Return value: `rax`
+- Stack pointer: `rsp`
+- Base pointer: `rbp`
+
+# Call Frame
+
+Stack grows downwards.
+
+```asm
+caller:
+    push rbp ; save old frame
+    mov rbp, rsp ; init frame
+    ; arguments passed in the stack are upwards
+    mov r14, [rbp + 0x10]
+    ; ...
+    mov rsp, rbp
+    pop rbp
+    ret
+```
 
 ## x86_64 Cheatsheet
 
 |s|b|
 |---|---|
 |a|b|
+|a|b|
+|a|b|
+|a|b|

sass/style.scss

@@ -209,3 +209,25 @@ h1,h2,h3 {
   border-bottom: 4px $color solid;
   border-bottom-color: #FFAA00;
 }
+
+table {
+  width: 100%;
+  margin: 1em 0px;
+  border-collapse: collapse;
+}
+
+table, th, td {
+  border: 1px solid;
+}
+
+th {
+  background-color: #2c2c2c;
+  color: white;
+}
+
+th, td {
+  padding: 10px;
+  text-align: left;
+}
+
+tr:nth-child(even) {background-color: #1b2127;}