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https://gitlab.freedesktop.org/mesa/mesa.git
synced 2026-05-20 13:28:09 +02:00
398a8d43dc
Since Mesa drivers are now version-locked to the loader, that means that we never need to support a newer hardware driver than the loader, and thus don't need to generate dynamic dispatch stubs. This is great news, given that we don't test those paths, and it involved delightful features like arrays of hex for code to be pasted into executable memory. More code removal will follow, this is the first cut of "don't generate, and DCE generation code". Fixes: #9158 Acked-by: Marek Olšák <marek.olsak@amd.com> Acked-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Reviewed-by: Adam Jackson <ajax@redhat.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23451>
144 lines
3.9 KiB
C
144 lines
3.9 KiB
C
/*
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* Mesa 3-D graphics library
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*
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* Copyright (C) 2010 LunarG Inc.
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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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* Chia-I Wu <olv@lunarg.com>
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*/
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#include <string.h>
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#ifdef __CET__
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#define ENDBR "endbr32\n\t"
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#else
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#define ENDBR
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#endif
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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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#define X86_ENTRY_SIZE 32
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__asm__(".text");
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__asm__("x86_current_tls:\n\t"
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"call 1f\n"
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"1:\n\t"
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"popl %eax\n\t"
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"addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %eax\n\t"
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"movl _glapi_tls_Dispatch@GOTNTPOFF(%eax), %eax\n\t"
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"ret");
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#ifndef GLX_X86_READONLY_TEXT
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__asm__(".section wtext, \"awx\", @progbits");
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#endif /* GLX_X86_READONLY_TEXT */
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__asm__(".balign 16\n"
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"x86_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 16\n" \
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func ":"
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#define STUB_ASM_CODE(slot) \
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ENDBR \
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"call 1f\n" \
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"1:\n\t" \
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"popl %eax\n\t" \
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"addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %eax\n\t" \
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"movl _glapi_tls_Dispatch@GOTNTPOFF(%eax), %eax\n\t" \
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"movl %gs:(%eax), %eax\n\t" \
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"jmp *(4 * " slot ")(%eax)"
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#define MAPI_TMP_STUB_ASM_GCC
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#include "mapi_tmp.h"
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#ifndef GLX_X86_READONLY_TEXT
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__asm__(".balign 16\n"
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"x86_entry_end:");
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__asm__(".text");
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#endif /* GLX_X86_READONLY_TEXT */
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#ifndef MAPI_MODE_BRIDGE
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extern unsigned long
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x86_current_tls();
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extern char x86_entry_start[] HIDDEN;
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extern char x86_entry_end[] HIDDEN;
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static inline mapi_func
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entry_generate_or_patch(int, char *, size_t);
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void
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entry_patch_public(void)
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{
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#ifndef GLX_X86_READONLY_TEXT
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char *entry;
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int slot = 0;
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for (entry = x86_entry_start; entry < x86_entry_end;
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entry += X86_ENTRY_SIZE, ++slot)
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entry_generate_or_patch(slot, entry, X86_ENTRY_SIZE);
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#endif
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}
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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) (x86_entry_start + slot * X86_ENTRY_SIZE);
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}
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static 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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*((unsigned long *) (code + 8)) = slot * sizeof(mapi_func);
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}
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static inline mapi_func
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entry_generate_or_patch(int slot, char *code, size_t size)
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{
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const char code_templ[16] = {
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0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, /* movl %gs:0x0, %eax */
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0xff, 0xa0, 0x34, 0x12, 0x00, 0x00, /* jmp *0x1234(%eax) */
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0x90, 0x90, 0x90, 0x90 /* nop's */
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};
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mapi_func entry;
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if (size < sizeof(code_templ))
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return NULL;
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memcpy(code, code_templ, sizeof(code_templ));
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*((unsigned long *) (code + 2)) = x86_current_tls();
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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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