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