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comparison dyncallback/dyncall_thunk_arm32_arm.c @ 38:fb416abb2059

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- armhf callback support (not all working, yet)
author cslag
date Fri, 18 Dec 2015 19:07:17 +0100
parents 3e629dc19168
children
comparison
equal deleted inserted replaced
37:020ef1972d31 38:fb416abb2059
33 .code 32 33 .code 32
34 sub %r12, %r15, #8 34 sub %r12, %r15, #8
35 ldr %r15, [%r15, #-4] 35 ldr %r15, [%r15, #-4]
36 */ 36 */
37 37
38 /* This code loads 'entry+8' into r15. The -4 is needed, because r15 as */ 38 /* This code stores a ptr to DCCallback in r12 (equals ptr to thunk, */
39 /* program counter points to the current instruction+8, but the pointer */ 39 /* which is PC (r15) minus 8, as PC points to current instruction+8. */
40 /* to the code to execute follows the ldr instruction directly. Add 8 to */ 40 /* Then it loads the callback 'entry' into PC. The -4 is needed, also bc */
41 /* entry for similar reasons. NOTE: Latter seems to be implicit with */ 41 /* of the PC pointing ahead. */
42 /* latest update of arm-eabi tools. */
43 p->code[0] = 0xe24fc008UL; /* sub %r12, %r15, #8 */ 42 p->code[0] = 0xe24fc008UL; /* sub %r12, %r15, #8 */
44 p->code[1] = 0xe51ff004UL; /* ldr %r15, [%r15, #-4] */ 43 p->code[1] = 0xe51ff004UL; /* ldr %r15, [%r15, #-4] */
45 p->entry = entry/*+8*/; 44 p->entry = entry;
46 } 45 }