GLdispatch: Implement the TLS dispatch stubs for PPC64LE.
Fill in STUB_ASM_CODE macro and ENTRY_TEMPLATE[] array, changing type of the latter to uint32_t[]. Define TEMPLATE_OFFSET_TLS_ADDR and TEMPLATE_OFFSET_SLOT relative to end of ENTRY_TEMPLATE[] array. Signed-off-by: Ben Crocker <bcrocker@redhat.com>
This commit is contained in:
Ben Crocker
Kyle Brenneman
parent
1c40432132
commit
290594c3e7
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@ -30,29 +30,45 @@
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#include <unistd.h>
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#include <string.h>
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#include "utils_misc.h"
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#include "u_macros.h"
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#include "glapi.h"
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#include "glvnd/GLdispatchABI.h"
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// TODO: Change this macro to be the size of the dispatch stubs.
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#define PPC64LE_ENTRY_SIZE 32
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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__(".section wtext,\"ax\",@progbits\n");
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__asm__(".balign 4096\n"
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__asm__(".balign " U_STRINGIFY(PPC64LE_PAGE_ALIGN) "\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:");
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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 ":"
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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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"nop"
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// TODO: Fill in this assembly code
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#define STUB_ASM_CODE(slot) \
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" addis 11, 2, _glapi_tls_Current@got@tprel@ha\n\t" \
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" ld 11, _glapi_tls_Current@got@tprel@l(11)\n\t" \
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" add 11, 11,_glapi_tls_Current@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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// Conceptually, this is:
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// {
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// void **dispatchTable = _glapi_tls_Current;
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@ -61,53 +77,92 @@ __asm__(".balign 4096\n"
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//
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// Note that _glapi_tls_Current is a global variable declared with
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// __thread.
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// See the x86-64 TLS code for an example.
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#define MAPI_TMP_STUB_ASM_GCC
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#include "mapi_tmp.h"
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__asm__(".balign 4096\n"
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__asm__(".balign " U_STRINGIFY(PPC64LE_PAGE_ALIGN) "\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:");
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__asm__(".text\n");
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__asm__("ppc64le_current_tls:\n\t"
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" addis 3, 2, _glapi_tls_Current@got@tprel@ha\n\t"
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" ld 3, _glapi_tls_Current@got@tprel@l(3)\n\t"
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" blr\n"
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);
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extern uint64_t ppc64le_current_tls();
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const int entry_type = __GLDISPATCH_STUB_PPC64LE;
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const int entry_stub_size = PPC64LE_ENTRY_SIZE;
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static const unsigned char ENTRY_TEMPLATE[] =
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static const uint32_t ENTRY_TEMPLATE[] =
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{
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// TODO: Fill in the assembly code here as well. This should be
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// functionally the same code as would be generated from the STUB_ASM_CODE
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// macro, but defined as a buffer.
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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. libglvnd 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_Current
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0, 0 // <ENTRY+48>: .quad <slot>*8
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};
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// These are the offsets in ENTRY_TEMPLATE of the values that we have to patch.
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static const int TEMPLATE_OFFSET_SLOT = 0;
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/*
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* TODO: Fill in these offsets. These are used in entry_generate_default_code
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* to patch the dispatch table index and any memory addresses in the generated
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* These are the offsets in ENTRY_TEMPLATE used in entry_generate_default_code
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* to patch the dispatch table index and the slot number in the generated
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* function.
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*
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* TEMPLATE_OFFSET_TLS_ADDR is the offset part of the _glapi_tls_Current
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*__thread variable,
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* TEMPLATE_OFFSET_SLOT is the dispatch table index.
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*/
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static const int TEMPLATE_OFFSET_TLS_ADDR = sizeof(ENTRY_TEMPLATE) - 16;
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static const int TEMPLATE_OFFSET_SLOT = sizeof(ENTRY_TEMPLATE) - 8;
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void entry_generate_default_code(char *entry, int slot)
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{
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char *writeEntry = u_execmem_get_writable(entry);
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STATIC_ASSERT(PPC64LE_ENTRY_SIZE >= sizeof(ENTRY_TEMPLATE));
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assert(slot >= 0);
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memcpy(writeEntry, ENTRY_TEMPLATE, sizeof(ENTRY_TEMPLATE));
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// TODO: Patch the dispatch table slot.
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*((uint32_t *) (writeEntry + TEMPLATE_OFFSET_SLOT)) = slot * sizeof(mapi_func);
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*((uint64_t *) (writeEntry + TEMPLATE_OFFSET_TLS_ADDR)) = (uintptr_t) ppc64le_current_tls();
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*((uint64_t *) (writeEntry + TEMPLATE_OFFSET_SLOT)) = slot * sizeof(mapi_func);
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// TODO: Patch any addresses necessary to look up the _glapi_tls_Current
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// variable from TLS.
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// TODO: Do any cache clears or anything else that is necessary on PPC64LE
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// to make self-modifying code work.
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// This sequence is from the PowerISA Version 2.07B book.
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// It may be a bigger hammer than we need, but it works;
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// note that the __builtin___clear_cache intrinsic for
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// PPC does not seem to generate any code.
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__asm__ __volatile__(
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" dcbst 0, %0\n\t"
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" sync\n\t"
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" icbi 0, %0\n\t"
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" isync\n"
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: "=r" (writeEntry)
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);
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}
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