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-rw-r--r--src/mapi/entry_ppc64le_tls.h152
1 files changed, 152 insertions, 0 deletions
diff --git a/src/mapi/entry_ppc64le_tls.h b/src/mapi/entry_ppc64le_tls.h
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index 00000000000..e09a1178a06
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+++ 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 <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 */