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comparison dyncall/dyncall_call_arm32_thumb_gas.s @ 175:00dd15cc5c87

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- fixed ARM32-THUMB stack alignment issues (found on Cortex-m0, thanks Darren Whobrey!)
author cslag
date Thu, 09 Feb 2017 15:44:14 +0100
parents 523c45dfa8fb
children 351bb41d3bb1
comparison
equal deleted inserted replaced
174:a8052efbde18 175:00dd15cc5c87
34 /* Main dyncall call. */ 34 /* Main dyncall call. */
35 .thumb_func 35 .thumb_func
36 dcCall_arm32_thumb: 36 dcCall_arm32_thumb:
37 37
38 /* Prolog. This function never needs to spill inside its prolog, so just store the permanent registers. */ 38 /* Prolog. This function never needs to spill inside its prolog, so just store the permanent registers. */
39 push {%r4-%r7, %r14} /* Frame ptr, permanent registers, link register -> save area on stack. */ 39 /* Code below is not using high registers, so not storing them in prolog, which is more involved with thumb, anyways. */
40 push {%r4-%r7, %r14} /* Frame ptr, permanent registers, link register -> save area on stack. */
40 mov %r7, %r13 /* Set frame ptr. */ 41 mov %r7, %r13 /* Set frame ptr. */
42 sub %r13, #4 /* Realign stack to 8 bytes (b/c we stored 5 regs = 20b). */
41 43
42 /* Call. */ 44 /* Call. */
43 mov %r4, %r0 /* Move 'fptr' to r4 (1st argument is passed in r0). */ 45 mov %r4, %r0 /* Move 'fptr' to r4 (1st argument is passed in r0). */
44
45 /* Disable 'thumb' address forcing... */
46
47 /* mov %r0, #1 */ /* Assure that LSB is set to 1 (THUMB call). - Not Required and not useful for interworking calls */
48 /* orr %r4, %r0 */
49
50 mov %r5, %r1 /* Move 'args' to r5 (2nd argument is passed in r1). */ 46 mov %r5, %r1 /* Move 'args' to r5 (2nd argument is passed in r1). */
51 mov %r6, %r2 /* Move 'size' to r6 (3rd argument is passed in r2). */ 47 mov %r6, %r2 /* Move 'size' to r6 (3rd argument is passed in r2). */
52 48
53 cmp %r6, #16 /* Jump to call if no more than 4 arguments. */ 49 cmp %r6, #16 /* Jump to call if no more than 4 arguments. */
54 ble call 50 ble call