153 lines
5.2 KiB
C
153 lines
5.2 KiB
C
/*
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* Mesa 3-D graphics library
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*
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* Copyright (C) 2017 Red Hat
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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 associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to 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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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Ben Crocker <bcrocker@redhat.com>
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*/
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#ifdef HAVE_FUNC_ATTRIBUTE_VISIBILITY
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#define HIDDEN __attribute__((visibility("hidden")))
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#else
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#define HIDDEN
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#endif
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// NOTE: These must be powers of two:
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#define PPC64LE_ENTRY_SIZE 64
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#define PPC64LE_PAGE_ALIGN 65536
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#if ((PPC64LE_ENTRY_SIZE & (PPC64LE_ENTRY_SIZE - 1)) != 0)
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#error PPC64LE_ENTRY_SIZE must be a power of two!
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#endif
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#if ((PPC64LE_PAGE_ALIGN & (PPC64LE_PAGE_ALIGN - 1)) != 0)
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#error PPC64LE_PAGE_ALIGN must be a power of two!
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#endif
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__asm__(".text\n"
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".balign " U_STRINGIFY(PPC64LE_ENTRY_SIZE) "\n"
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"ppc64le_entry_start:");
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#define STUB_ASM_ENTRY(func) \
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".globl " func "\n" \
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".type " func ", @function\n" \
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".balign " U_STRINGIFY(PPC64LE_ENTRY_SIZE) "\n" \
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func ":\n\t" \
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" addis 2, 12, .TOC.-" func "@ha\n\t" \
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" addi 2, 2, .TOC.-" func "@l\n\t" \
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" .localentry " func ", .-" func "\n\t"
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#define STUB_ASM_CODE(slot) \
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" addis 11, 2, " ENTRY_CURRENT_TABLE "@got@tprel@ha\n\t" \
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" ld 11, " ENTRY_CURRENT_TABLE "@got@tprel@l(11)\n\t" \
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" add 11, 11," ENTRY_CURRENT_TABLE "@tls\n\t" \
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" ld 11, 0(11)\n\t" \
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" ld 12, " slot "*8(11)\n\t" \
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" mtctr 12\n\t" \
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" bctr\n" \
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#define MAPI_TMP_STUB_ASM_GCC
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#include "mapi_tmp.h"
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#ifndef MAPI_MODE_BRIDGE
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#include <string.h>
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#include "u_execmem.h"
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void
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entry_patch_public(void)
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{
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}
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extern char
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ppc64le_entry_start[] HIDDEN;
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mapi_func
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entry_get_public(int slot)
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{
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return (mapi_func) (ppc64le_entry_start + slot * PPC64LE_ENTRY_SIZE);
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}
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__asm__(".text\n");
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__asm__("ppc64le_dispatch_tls:\n\t"
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" addis 3, 2, " ENTRY_CURRENT_TABLE "@got@tprel@ha\n\t"
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" ld 3, " ENTRY_CURRENT_TABLE "@got@tprel@l(3)\n\t"
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" blr\n"
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);
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extern uint64_t ppc64le_dispatch_tls();
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static const uint32_t code_templ[] = {
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// This should be functionally the same code as would be generated from
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// the STUB_ASM_CODE macro, but defined as a buffer.
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// This is used to generate new dispatch stubs. Mesa will copy this
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// data to the dispatch stub, and then it will patch the slot number and
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// any addresses that it needs to.
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// NOTE!!! NOTE!!! NOTE!!!
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// This representation is correct for both little- and big-endian systems.
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// However, more work needs to be done for big-endian Linux because it
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// adheres to an older, AIX-compatible ABI that uses function descriptors.
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// 1000:
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0x7C0802A6, // <ENTRY+00>: mflr 0
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0xF8010010, // <ENTRY+04>: std 0, 16(1)
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0xE96C0028, // <ENTRY+08>: ld 11, 9000f-1000b+0(12)
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0x7D6B6A14, // <ENTRY+12>: add 11, 11, 13
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0xE96B0000, // <ENTRY+16>: ld 11, 0(11)
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0xE80C0030, // <ENTRY+20>: ld 0, 9000f-1000b+8(12)
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0x7D8B002A, // <ENTRY+24>: ldx 12, 11, 0
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0x7D8903A6, // <ENTRY+28>: mtctr 12
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0x4E800420, // <ENTRY+32>: bctr
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0x60000000, // <ENTRY+36>: nop
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// 9000:
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0, 0, // <ENTRY+40>: .quad _glapi_tls_Dispatch
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0, 0 // <ENTRY+48>: .quad <slot>*8
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};
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static const uint64_t TEMPLATE_OFFSET_TLS_ADDR = sizeof(code_templ) - 2*8;
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static const uint64_t TEMPLATE_OFFSET_SLOT = sizeof(code_templ) - 1*8;
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void
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entry_patch(mapi_func entry, int slot)
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{
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char *code = (char *) entry;
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*((uint64_t *) (code + TEMPLATE_OFFSET_TLS_ADDR)) = ppc64le_dispatch_tls();
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*((uint64_t *) (code + TEMPLATE_OFFSET_SLOT)) = slot * sizeof(mapi_func);
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}
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mapi_func
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entry_generate(int slot)
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{
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char *code;
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mapi_func entry;
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code = u_execmem_alloc(sizeof(code_templ));
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if (!code)
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return NULL;
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memcpy(code, code_templ, sizeof(code_templ));
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entry = (mapi_func) code;
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entry_patch(entry, slot);
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return entry;
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}
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#endif /* MAPI_MODE_BRIDGE */
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