116 lines
4.5 KiB
C
116 lines
4.5 KiB
C
/*
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* Copyright (c) 2016, NVIDIA CORPORATION.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and/or associated documentation files (the
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* "Materials"), to deal in the Materials without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Materials, and to
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* permit persons to whom the Materials are furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* unaltered in all copies or substantial portions of the Materials.
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* Any additions, deletions, or changes to the original source files
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* must be clearly indicated in accompanying documentation.
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*
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* THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
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*/
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#include "entry.h"
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#include "entry_common.h"
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#include <string.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <assert.h>
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#include "glapi.h"
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#include "u_macros.h"
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#include "u_current.h"
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#include "utils_misc.h"
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#include "glvnd/GLdispatchABI.h"
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/*
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* See: https://sourceware.org/binutils/docs/as/ARM-Directives.html
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*/
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/*
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* The size of each dispatch stub.
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*/
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#define ENTRY_STUB_ALIGN 128
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#if !defined(GLDISPATCH_PAGE_SIZE)
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// Note that on aarch64, the page size could be 4K or 64K. Pick 64K, since that
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// will work in either case.
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#define GLDISPATCH_PAGE_SIZE 65536
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#endif
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#define STUB_ASM_ENTRY(func) \
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".balign " U_STRINGIFY(ENTRY_STUB_ALIGN) "\n\t" \
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".global " func "\n\t" \
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".type " func ", %function\n\t" \
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func ":\n\t"
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/*
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* Looks up the current dispatch table, finds the stub address at the given slot
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* then jumps to it.
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*
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* First tries to find a dispatch table in _glapi_Current[GLAPI_CURRENT_DISPATCH],
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* if not found then it jumps to the 'lookup_dispatch' and calls
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* _glapi_get_current() then jumps back to the 'found_dispatch' label.
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*
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* The 'found_dispatch' section computes the correct offset in the dispatch
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* table then does a branch without link to the function address.
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*/
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#define STUB_ASM_CODE(slot) \
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"stp x1, x0, [sp, #-16]!\n\t" \
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"adrp x0, :got:_glapi_Current\n\t" \
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"ldr x0, [x0, #:got_lo12:_glapi_Current]\n\t" \
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"ldr x0, [x0]\n\t" \
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"cbz x0, 10f\n\t" \
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"11:\n\t" /* found dispatch */ \
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"ldr x1, 3f\n\t" \
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"ldr x16, [x0, x1]\n\t" \
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"ldp x1, x0, [sp], #16\n\t" \
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"br x16\n\t" \
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"10:\n\t" /* lookup dispatch */ \
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"str x30, [sp, #-16]!\n\t" \
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"stp x7, x6, [sp, #-16]!\n\t" \
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"stp x5, x4, [sp, #-16]!\n\t" \
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"stp x3, x2, [sp, #-16]!\n\t" \
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"adrp x0, :got:_glapi_get_current\n\t" \
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"ldr x0, [x0, #:got_lo12:_glapi_get_current]\n\t" \
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"blr x0\n\t" \
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"ldp x3, x2, [sp], #16\n\t" \
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"ldp x5, x4, [sp], #16\n\t" \
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"ldp x7, x6, [sp], #16\n\t" \
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"ldr x30, [sp], #16\n\t" \
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"b 11b\n\t" \
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"3:\n\t" \
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".xword " slot " * 8\n\t" /* size of (void *) */
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__asm__(".section wtext,\"ax\"\n"
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".balign " U_STRINGIFY(GLDISPATCH_PAGE_SIZE) "\n"
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".globl public_entry_start\n"
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".hidden public_entry_start\n"
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"public_entry_start:\n");
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#define MAPI_TMP_STUB_ASM_GCC
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#include "mapi_tmp.h"
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__asm__(".balign " U_STRINGIFY(GLDISPATCH_PAGE_SIZE) "\n"
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".globl public_entry_end\n"
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".hidden public_entry_end\n"
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"public_entry_end:\n"
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".text\n\t");
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const int entry_type = __GLDISPATCH_STUB_AARCH64;
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const int entry_stub_size = ENTRY_STUB_ALIGN;
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