2012-02-21 Jeremy Bennett <jeremy.bennett@embecosm.com>
Alan Lehotsky <apl@alum.mit.edu> Joern Rennecke <joern.rennecke@embecosm.com> * configure.in: Add Epiphany support. * configure: Regenerate. * epiphany: New directory. * libgloss/README: Add Epiphany entry.
This commit is contained in:
Jeff Johnston
166
libgloss/epiphany/crt0.S
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166
libgloss/epiphany/crt0.S
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# C Startup for EPIPHANY
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# Copyright (c) 2011, Adapteva, Inc.
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# All rights reserved.
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# * Neither the name of Adapteva nor the names of its contributors may be
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# used to endorse or promote products derived from this software without
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# specific prior written permission.
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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.section IVT,"a",@progbits ;
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.global _start;
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.type _start, %function;
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_start:
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.balign 4 ;
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b .normal_start
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.balign 4 ; 0x4
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b .sw_exception_v
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.balign 4 ; 0x8
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b .page_miss_v;
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.balign 4 ; 0xc
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b .timer0_expired_v
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.balign 4 ; 0x10
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b .timer1_expired_v
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.balign 4 ; 0x14
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b .message_v
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.balign 4 ; 0x18
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b .dma0_v
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.balign 4 ; 0x1c
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b .dma1_v
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.balign 4 ; 0x20
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b .wand_v
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.balign 4 ; 0x24
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b .soft_v
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.size _start, .-_start
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.section RESERVED_CRT0,"a",@progbits ;
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.global .normal_start;
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.balign 4
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.type .normal_start, %function
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.normal_start:
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mov r3,%low(_external_start)
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movt r3,%high(_external_start)
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jalr r3
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.size .normal_start, .-.normal_start
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.section .text;
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.org 0x0000 ; Relative to start of text section
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.global _external_start
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.type _external_start, %function
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_external_start:
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.align 4
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;; Initialise the stack pointer and frame pointer. Hopefully __stack
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;; is somewhere meaningful.
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mov sp,%low(___stack)
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movt sp,%high(___stack)
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mov fp,sp
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;; Zero the data space
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mov r0,%low(___bss_start)
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movt r0,%high(___bss_start)
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mov r1,%low(_end)
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movt r1,%high(_end)
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mov r2,#0
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mov r3,#0
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.L0_init_:
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strd r2,[r0],+#1
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sub r5,r1,r0
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bne .L0_init_
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;; Setup destructors to be called from exit if main never returns
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#if 0
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mov r0,%low(fini)
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movt r0,%high(fini)
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mov r2,%low(_atexit)
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movt r2,%high(_atexit)
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jalr r2
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#else
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; calling atexit drags in malloc, so instead poke the function
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; address directly into the reent structure
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mov r2,%low(__impure_ptr)
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movt r2,%high(__impure_ptr)
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ldr r2,[r2]
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mov r1,%low(fini)
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movt r1,%high(fini)
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#ifdef __STRUCT_ALIGN_64__
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#error
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add r2,r2,need_to_find_out; &_GLOBAL_REENT->atexit0
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str r2, [r2,-1];??or -2?; _GLOBAL_REENT->atexit
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mov r0, 1
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str r0, [r2,1] ; _GLOBAL_REENT->atexit0._ind
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str r1, [r2,2] ; _GLOBAL_REENT->atexit0._fns[0]
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#else /* !__STRUCT_ALIGN_64__ */
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add r0,r2,0x14c ; &_GLOBAL_REENT->atexit0
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str r0, [r0,-1] ; _GLOBAL_REENT->atexit
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mov r0, 1
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strd r0, [r2,0x2a] ; _GLOBAL_REENT->atexit0._ind
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#endif /* !__STRUCT_ALIGN_64__ */
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#endif /* !0 */
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;; Call global and static constructors
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mov r2,%low(init)
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movt r2,%high(init)
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jalr r2
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;;return from reset ISR
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mov R0,%low(RDS)
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movt R0,%high(RDS)
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movts iret,r0
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rti
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RDS:
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;; Initialise argc, argv and envp to empty and call main
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mov r0,#0
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mov r1,#0
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mov r2,#0
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mov r3,%low(_main)
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movt r3,%high(_main)
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jalr r3
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;;bl _main
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;; Call exit
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mov r3,%low(_exit)
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movt r3,%high(_exit)
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jalr r3
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;;bl _exit
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;; Should never reach here
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idle
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.size _external_start, .-_external_start
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