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1 /*
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2
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3 Package: dyncall
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4 Library: dyncall
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5 File: dyncall/dyncall_call_arm32_arm.S
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6 Description: Call Kernel for ARM 32-bit ARM Architecture
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7 License:
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8
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9 Copyright (c) 2007-2015 Daniel Adler <dadler@uni-goettingen.de>,
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10 Tassilo Philipp <tphilipp@potion-studios.com>
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11
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12 Permission to use, copy, modify, and distribute this software for any
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13 purpose with or without fee is hereby granted, provided that the above
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14 copyright notice and this permission notice appear in all copies.
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15
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16 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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17 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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18 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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19 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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23
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24 */
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25
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26
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27
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28 #include "../portasm/portasm-arm.S"
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29
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30 /* ============================================================================
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31 DynCall Call Kernel for ARM 32-bit ARM Architecture
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32 ----------------------------------------------------------------------------
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33 C Interface:
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34 dcCall_arm32_arm(DCpointer target, DCpointer argv, DCsize size);
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35
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36 This Call Kernel works across multiple OS.
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37 It has been tested on Nintendo DS, Linux and Darwin(iOS).
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38
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39 */
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40
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41 .text
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42 .code 32 /* ARM mode */
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43 .align 4
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44 GLOBAL_C(dcCall_arm32_arm)
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45 ENTRY_C(dcCall_arm32_arm)
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46 /* Prolog. This function never needs to spill inside its prolog, so just store the permanent registers. */
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47 mov r12, r13 /* Stack ptr (r13) -> temporary (r12). */
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48 stmdb r13!, {r4-r12, r14} /* Permanent registers and stack pointer (now in r12), etc... -> save area on stack (except counter). */
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49 mov r11, r12 /* Set frame ptr. */
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50
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51 /* Call. */
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52 mov r4, r0 /* r4 = 'fptr' (1st argument is passed in r0). */
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53 mov r5, r1 /* r5 = 'args' (2nd argument is passed in r1). */
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54 mov r6, r2 /* r6 = 'size' (3rd argument is passed in r2). */
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55 ldmia r5!, {r0-r3} /* Load first 4 arguments for new call into r0-r3. */
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56
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57 subs r6, r6, #16 /* Size of remaining arguments. */
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58 ble call /* Jump to call if no more arguments. */
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59
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60 sub r13, r13, r6 /* Set stack pointer to top of stack. */
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61 and r9, r6, #7 /* Align stack on 8 byte boundaries. */
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62 sub r13, r13, r9
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63
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64 mov r8, r13 /* Temp. destination pointer. */
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65 mov r9, #0 /* Init byte counter. */
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66
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67 pushArgs:
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68 ldrb r7, [r5, r9] /* Load a byte into r7. */
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69 strb r7, [r8, r9] /* Push byte onto stack. */
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70 add r9, r9, #1 /* Increment byte counter. */
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71 cmp r9, r6
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72 bne pushArgs
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73
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74 call:
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75 /* 'blx %r4' workaround for ARMv4t: */
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76 mov r14, r15 /* Branch return address(r15) -> link register (r14) -- r15 always points to address of current + 2 instructions (= Epilog code). */
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77 bx r4 /* Call (ARM/THUMB), available for ARMv4t. */
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78
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79 /* Epilog. */
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80 ldmdb r11, {r4-r11, r13, r15} /* Restore permanent registers (ignore temporary (r12), restore stack ptr and program counter).@@@db not needed since we rewrite r13? */
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81
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