Mercurial > pub > dyncall > dyncall
annotate dyncall/dyncall_call_arm32_thumb_gas.s @ 663:127b569978cc default tip
- another tweak handling clang trying to be too smart (see last commit)
| author | Tassilo Philipp |
|---|---|
| date | Sun, 24 Mar 2024 13:52:44 +0100 |
| parents | 351bb41d3bb1 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 | |
| 3 Package: dyncall | |
| 4 Library: dyncall | |
| 5 File: dyncall/dyncall_call_arm32_thumb_gas.s | |
| 6 Description: ARM Thumb call kernel implementation for GNU assembler. | |
| 7 License: | |
| 8 | |
|
406
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
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9 Copyright (c) 2007-2021 Daniel Adler <dadler@uni-goettingen.de>, |
| 0 | 10 Tassilo Philipp <tphilipp@potion-studios.com> |
| 11 | |
| 12 Permission to use, copy, modify, and distribute this software for any | |
| 13 purpose with or without fee is hereby granted, provided that the above | |
| 14 copyright notice and this permission notice appear in all copies. | |
| 15 | |
| 16 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
| 17 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
| 18 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
| 19 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| 20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
| 21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
| 22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
| 23 | |
| 24 */ | |
| 25 | |
| 26 | |
| 27 .text | |
| 28 #if !defined(__thumb2__) | |
| 29 .code 16 /* THUMB mode */ | |
| 30 #endif | |
| 31 | |
| 32 .globl dcCall_arm32_thumb | |
| 33 | |
| 34 /* Main dyncall call. */ | |
| 35 .thumb_func | |
| 36 dcCall_arm32_thumb: | |
| 37 | |
| 38 /* Prolog. This function never needs to spill inside its prolog, so just store the permanent registers. */ | |
|
175
00dd15cc5c87
- fixed ARM32-THUMB stack alignment issues (found on Cortex-m0, thanks Darren Whobrey!)
cslag
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39 /* Code below is not using high registers, so not storing them in prolog, which is more involved with thumb, anyways. */ |
|
406
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
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40 push {r4-r7, r14} /* Frame ptr, permanent registers, link register -> save area on stack. */ |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
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41 mov r7, r13 /* Set frame ptr. */ |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
diff
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42 sub r13, #4 /* Realign stack to 8 bytes (b/c we stored 5 regs = 20b). */ |
| 0 | 43 |
| 44 /* Call. */ | |
|
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- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
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45 mov r4, r0 /* Move 'fptr' to r4 (1st argument is passed in r0). */ |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
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46 mov r5, r1 /* Move 'args' to r5 (2nd argument is passed in r1). */ |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
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47 mov r6, r2 /* Move 'size' to r6 (3rd argument is passed in r2). */ |
| 0 | 48 |
|
406
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
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49 cmp r6, #16 /* Jump to call if no more than 4 arguments. */ |
| 0 | 50 ble call |
| 51 | |
|
406
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
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52 sub r6, #16 /* Size of remaining arguments. */ |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
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53 mov r0, r13 /* Set stack pointer to top of stack. */ |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
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54 sub r0, r0, r6 |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
diff
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55 lsr r0, #3 /* Align stack on 8 byte boundaries. */ |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
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diff
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56 lsl r0, #3 |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
diff
changeset
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57 mov r13, r0 |
| 0 | 58 |
|
406
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
diff
changeset
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59 add r1, #16 /* Let r1 point to remaining arguments. */ |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
diff
changeset
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60 mov r2, #0 /* Init byte counter to 0. */ |
| 0 | 61 .thumb_func |
| 62 pushArgs: | |
|
406
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
diff
changeset
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63 ldrb r3, [r1, r2] /* Load a byte into r3. */ |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
diff
changeset
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64 strb r3, [r0, r2] /* Push byte onto stack. */ |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
diff
changeset
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65 add r2, r2, #1 /* Increment byte counter. */ |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
diff
changeset
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66 cmp r2, r6 |
| 0 | 67 bne pushArgs |
| 68 .thumb_func | |
| 69 call: | |
|
406
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
diff
changeset
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70 ldmia r5!, {r0-r3} /* Load first 4 arguments for new call into r0-r3. */ |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
diff
changeset
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71 |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
diff
changeset
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72 /* 'blx r4' workaround for ARMv4t in THUMB: */ |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
diff
changeset
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73 mov r6, r15 /* Load PC+2 instructions from here */ |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
diff
changeset
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74 add r6, #5 /* Increment by 2 instructions (Address of 'Epilog') and set bit 0 (THUMB) */ |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
diff
changeset
|
75 mov r14, r6 /* Store in link register. */ |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
diff
changeset
|
76 bx r4 /* Branch and force THUMB-mode return (LR bit 0 set). */ |
| 0 | 77 |
| 78 /* Epilog. */ | |
|
406
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
diff
changeset
|
79 mov r13, r7 /* Reset stack ptr. */ |
|
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
175
diff
changeset
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80 pop {r4-r7, r15} /* Restore permanent registers and program counter. (Force a stay in THUMB in ARMv4, whether ARMv5 can return in ARM or THUMB depending on the bit 0. */ |
| 0 | 81 |