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Message
From: Balaji V. Iyer<bviyer@n...>
Date: Wed May 4 01:04:43 CEST 2005
Subject: [openrisc] Starting Stack Value and arguments passing
Hello Everyone,
I have a couple questions about stack and register values
initialization. I am also "cut and pasting" a copy of the _start from
the object dump of a simple file. My question is, what is the stack
register (r1) initialized as? Also, when we have a main function like
this:
int main(int argc, char *argv[]), How are the argc and argv passed into
the function. In the below code, r3 is used, so what value does it
originally contain?
Any Help is Appreciated.
Yours Sincerely,
Balaji V. Iyer.
Here is the objdump:
0100016c <_start>:
100016c: 9c 21 ff f8 l.addi r1,r1,0xfffffff8
1000170: d4 01 48 00 l.sw 0x0(r1),r9
1000174: d4 01 10 04 l.sw 0x4(r1),r2
1000178: 9c 41 00 08 l.addi r2,r1,0x8
100017c: a8 a3 00 00 l.ori r5,r3,0x0
1000180: 84 63 ff fc l.lwz r3,0xfffffffc(r3)
1000184: a8 85 00 00 l.ori r4,r5,0x0
1000188: b9 83 00 02 l.slli r12,r3,0x2
100018c: e0 a5 60 00 l.add r5,r5,r12
1000190: 04 00 00 15 l.jal 10001e4 <___uClibc_main>
1000194: 9c a5 00 04 l.addi r5,r5,0x4
1000198: 84 41 00 04 l.lwz r2,0x4(r1)
100019c: 85 21 00 00 l.lwz r9,0x0(r1)
10001a0: 44 00 48 00 l.jr r9
10001a4: 9c 21 00 08 l.addi r1,r1,0x8
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