Mercurial > pub > dyncall > dyncall
diff dyncall/dyncall_call_arm32_arm.S @ 0:3e629dc19168
initial from svn dyncall-1745
author | Daniel Adler |
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date | Thu, 19 Mar 2015 22:24:28 +0100 |
parents | |
children | 2bce7629f541 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/dyncall/dyncall_call_arm32_arm.S Thu Mar 19 22:24:28 2015 +0100 @@ -0,0 +1,81 @@ +/* + + Package: dyncall + Library: dyncall + File: dyncall/dyncall_call_arm32_arm.S + Description: Call Kernel for ARM 32-bit ARM Architecture + License: + + Copyright (c) 2007-2015 Daniel Adler <dadler@uni-goettingen.de>, + Tassilo Philipp <tphilipp@potion-studios.com> + + Permission to use, copy, modify, and distribute this software for any + purpose with or without fee is hereby granted, provided that the above + copyright notice and this permission notice appear in all copies. + + THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + +*/ + + + +#include "../portasm/portasm-arm.S" + +/* ============================================================================ + DynCall Call Kernel for ARM 32-bit ARM Architecture + ---------------------------------------------------------------------------- + C Interface: + dcCall_arm32_arm(DCpointer target, DCpointer argv, DCsize size); + + This Call Kernel works across multiple OS. + It has been tested on Nintendo DS, Linux and Darwin(iOS). + +*/ + +.text +.code 32 /* ARM mode */ +.align 4 +GLOBAL_C(dcCall_arm32_arm) +ENTRY_C(dcCall_arm32_arm) + /* Prolog. This function never needs to spill inside its prolog, so just store the permanent registers. */ + mov r12, r13 /* Stack ptr (r13) -> temporary (r12). */ + stmdb r13!, {r4-r12, r14} /* Permanent registers and stack pointer (now in r12), etc... -> save area on stack (except counter). */ + mov r11, r12 /* Set frame ptr. */ + + /* Call. */ + mov r4, r0 /* r4 = 'fptr' (1st argument is passed in r0). */ + mov r5, r1 /* r5 = 'args' (2nd argument is passed in r1). */ + mov r6, r2 /* r6 = 'size' (3rd argument is passed in r2). */ + ldmia r5!, {r0-r3} /* Load first 4 arguments for new call into r0-r3. */ + + subs r6, r6, #16 /* Size of remaining arguments. */ + ble call /* Jump to call if no more arguments. */ + + sub r13, r13, r6 /* Set stack pointer to top of stack. */ + and r9, r6, #7 /* Align stack on 8 byte boundaries. */ + sub r13, r13, r9 + + mov r8, r13 /* Temp. destination pointer. */ + mov r9, #0 /* Init byte counter. */ + +pushArgs: + ldrb r7, [r5, r9] /* Load a byte into r7. */ + strb r7, [r8, r9] /* Push byte onto stack. */ + add r9, r9, #1 /* Increment byte counter. */ + cmp r9, r6 + bne pushArgs + +call: + /* 'blx %r4' workaround for ARMv4t: */ + mov r14, r15 /* Branch return address(r15) -> link register (r14) -- r15 always points to address of current + 2 instructions (= Epilog code). */ + bx r4 /* Call (ARM/THUMB), available for ARMv4t. */ + + /* Epilog. */ + 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? */ +