| 1 | /* crt0-efi-ia64.S - IA-64 EFI startup code. |
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| 2 | Copyright (C) 1999 Hewlett-Packard Co. |
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| 3 | Contributed by David Mosberger <davidm@hpl.hp.com>. |
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| 4 | |
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| 5 | All rights reserved. |
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| 6 | |
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| 7 | Redistribution and use in source and binary forms, with or without |
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| 8 | modification, are permitted provided that the following conditions |
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| 9 | are met: |
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| 10 | |
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| 11 | * Redistributions of source code must retain the above copyright |
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| 12 | notice, this list of conditions and the following disclaimer. |
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| 13 | * Redistributions in binary form must reproduce the above |
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| 14 | copyright notice, this list of conditions and the following |
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| 15 | disclaimer in the documentation and/or other materials |
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| 16 | provided with the distribution. |
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| 17 | * Neither the name of Hewlett-Packard Co. nor the names of its |
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| 18 | contributors may be used to endorse or promote products derived |
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| 19 | from this software without specific prior written permission. |
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| 20 | |
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| 21 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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| 22 | CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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| 23 | INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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| 24 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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| 25 | DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS |
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| 26 | BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, |
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| 27 | OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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| 28 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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| 29 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 30 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR |
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| 31 | TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF |
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| 32 | THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 33 | SUCH DAMAGE. |
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| 34 | */ |
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| 35 | .text |
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| 36 | .psr abi64 |
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| 37 | .psr lsb |
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| 38 | .lsb |
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| 39 | |
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| 40 | .proc _start |
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| 41 | _start: |
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| 42 | alloc loc0=ar.pfs,2,2,2,0 |
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| 43 | mov loc1=rp |
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| 44 | movl out0=@gprel(ImageBase) // out0 <- ImageBase (ldbase) |
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| 45 | ;; |
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| 46 | add out0=out0,gp |
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| 47 | movl out1=@gprel(_DYNAMIC) // out1 <- _DYNAMIC |
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| 48 | ;; // avoid WAW on CFM |
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| 49 | add out1=out1,gp |
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| 50 | br.call.sptk.few rp=_relocate |
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| 51 | .Lret0: |
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| 52 | cmp.ne p6,p0=r0,r8 // r8 == EFI_SUCCESS? |
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| 53 | (p6) br.cond.sptk.few .exit // no -> |
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| 54 | |
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| 55 | .Lret1: |
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| 56 | |
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| 57 | mov out0=in0 // image handle |
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| 58 | mov out1=in1 // systab |
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| 59 | br.call.sptk.few rp=efi_main |
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| 60 | .Lret2: |
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| 61 | .exit: |
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| 62 | mov ar.pfs=loc0 |
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| 63 | mov rp=loc1 |
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| 64 | ;; |
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| 65 | br.ret.sptk.few rp |
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| 66 | |
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| 67 | .endp _start |
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| 68 | |
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| 69 | |
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| 70 | // PE32+ wants a PLABEL, not the code address of the entry point: |
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| 71 | |
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| 72 | .align 16 |
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| 73 | .global _start_plabel |
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| 74 | .section .plabel, "a" |
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| 75 | _start_plabel: |
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| 76 | data8 _start |
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| 77 | data8 __gp |
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| 78 | |
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| 79 | // hand-craft a .reloc section for the plabel: |
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| 80 | |
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| 81 | #define IMAGE_REL_BASED_DIR64 10 |
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| 82 | |
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| 83 | .section .reloc, "a" |
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| 84 | data4 _start_plabel // Page RVA |
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| 85 | data4 12 // Block Size (2*4+2*2) |
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| 86 | data2 (IMAGE_REL_BASED_DIR64<<12) + 0 // reloc for plabel's entry point |
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| 87 | data2 (IMAGE_REL_BASED_DIR64<<12) + 8 // reloc for plabel's global pointer |
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