1 files changed, 50 insertions, 0 deletions
diff --git a/src/mesa/x86-64/calling_convention.txt b/src/mesa/x86-64/calling_convention.txt
new file mode 100644
index 00000000000..4147f7eba91
--- /dev/null
+++ b/src/mesa/x86-64/calling_convention.txt
@@ -0,0 +1,50 @@
+Register Usage
+rax      temporary register; with variable arguments passes information
+         about the number of SSE registers used; 1st return register
+
+rbx*     callee-saved register; optionally used as base pointer
+
+rcx      used to pass 4th integer argument to functions
+
+rdx      used to pass 3rd argument to functions 2nd return register
+
+rsp*     stack pointer
+
+rbp*     callee-saved register; optionally used as frame pointer
+
+rsi      used to pass 2nd argument to functions
+
+rdi      used to pass 1st argument to functions
+
+r8       used to pass 5th argument to functions
+
+r9       used to pass 6th argument to functions
+
+r10      temporary register, used for passing a function's static chain pointer
+
+r11      temporary register
+
+r12-15*  callee-saved registers
+
+xmm0�1   used to pass and return floating point arguments
+
+xmm2�7   used to pass floating point arguments
+
+xmm8�15  temporary registers
+
+mmx0�7   temporary registers
+
+st0      temporary register; used to return long double arguments
+
+st1      temporary registers; used to return long double arguments
+
+st2�7    temporary registers
+
+fs       Reserved for system use (as thread specific data register)
+
+	
+
+*) must be preserved across function calls
+
+Integer arguments from list: rdi,rsi,rdx,rcx,r8,r9,stack
+Floating point arguments from list: xmm0-xmm7
+\ No newline at end of file