blob: ae693be55b3591be1542d2ba87b1c7fb332655e7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
ABI, according to http://www.x86-64.org/documentation/abi-0.99.pdf:
Up to 6 integer and pointer arguments are passed in registers. Nine
registers, %rax, %rcx, %rdx, %rsi, %rdi and %r8-%r11 can be used
freely. Integers and pointers are returned in %rax.
Registers May be Argument
clobbered number
%rax Y
%rbx
%rcx Y 4
%rdx Y 3
%rbp
%rsi Y 2
%rdi Y 1
%rsp (SP)
%r8 Y 5
%r9 Y 6
%r10 Y
%r11 Y
%r12
%r13
%r14
%r15
W64 ABI, according to
http://msdn.microsoft.com/en-us/library/9z1stfyw.aspx:
Registers May be Argument
clobbered number
%rax Y
%rbx
%rcx Y 1
%rdx Y 2
%rbp
%rsi
%rdi
%rsp (SP)
%r8 Y 3
%r9 Y 4
%r10 Y
%r11 Y
%r12
%r13
%r14
%r15
Additional arguments are passed on the stack. "backing store" on the
stack for the four register arguments is also required. %xmm6 to
%xmm15 are callee-saved. The "long" type is just 32 bits.
If we have five arguments, and push the additional callee-save
registers %rdi and %rsi on the stack, we get a stack frame like
56(%rsp): Fifth argument
48(%rsp): Space for fourth argument
40(%rsp): Space for third argument
32(%rsp): Space for second argument
24(%rsp): Space for first argument
16(%rsp): Return address
8(%rsp): Saved %rsi
(%rsp) : Saved %rdi
|
