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Diffstat (limited to 'src/mapi/entry_ppc64le_tls.h')
| -rw-r--r-- | src/mapi/entry_ppc64le_tls.h | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/src/mapi/entry_ppc64le_tls.h b/src/mapi/entry_ppc64le_tls.h new file mode 100644 index 00000000000..e09a1178a06 --- /dev/null +++ b/src/mapi/entry_ppc64le_tls.h @@ -0,0 +1,152 @@ +/* + * 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 <[email protected]> + */ + +#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 */ |