mirror of
https://github.com/yuzu-emu/unicorn.git
synced 2024-10-19 08:28:20 +02:00
remove unused tcg_register_jit() and related code
This commit is contained in:
Nguyen Anh Quynh
parent
075ccadbe9
commit
e0cb02569e
@ -2331,79 +2331,3 @@ static void tcg_target_init(TCGContext *s)
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tcg_add_target_add_op_defs(s, x86_op_defs);
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}
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typedef struct {
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DebugFrameHeader h;
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uint8_t fde_def_cfa[4];
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uint8_t fde_reg_ofs[14];
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} DebugFrame;
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/* We're expecting a 2 byte uleb128 encoded value. */
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QEMU_BUILD_BUG_ON(FRAME_SIZE >= (1 << 14));
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#if !defined(__ELF__)
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/* Host machine without ELF. */
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#elif TCG_TARGET_REG_BITS == 64
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#define ELF_HOST_MACHINE EM_X86_64
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static const DebugFrame debug_frame = {
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.h.cie.len = sizeof(DebugFrameCIE)-4, /* length after .len member */
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.h.cie.id = -1,
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.h.cie.version = 1,
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.h.cie.code_align = 1,
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.h.cie.data_align = 0x78, /* sleb128 -8 */
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.h.cie.return_column = 16,
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/* Total FDE size does not include the "len" member. */
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.h.fde.len = sizeof(DebugFrame) - offsetof(DebugFrame, h.fde.cie_offset),
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.fde_def_cfa = {
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12, 7, /* DW_CFA_def_cfa %rsp, ... */
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(FRAME_SIZE & 0x7f) | 0x80, /* ... uleb128 FRAME_SIZE */
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(FRAME_SIZE >> 7)
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},
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.fde_reg_ofs = {
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0x90, 1, /* DW_CFA_offset, %rip, -8 */
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/* The following ordering must match tcg_target_callee_save_regs. */
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0x86, 2, /* DW_CFA_offset, %rbp, -16 */
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0x83, 3, /* DW_CFA_offset, %rbx, -24 */
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0x8c, 4, /* DW_CFA_offset, %r12, -32 */
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0x8d, 5, /* DW_CFA_offset, %r13, -40 */
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0x8e, 6, /* DW_CFA_offset, %r14, -48 */
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0x8f, 7, /* DW_CFA_offset, %r15, -56 */
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}
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};
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#else
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#define ELF_HOST_MACHINE EM_386
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static const DebugFrame debug_frame = {
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.h.cie.len = sizeof(DebugFrameCIE)-4, /* length after .len member */
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.h.cie.id = -1,
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.h.cie.version = 1,
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.h.cie.code_align = 1,
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.h.cie.data_align = 0x7c, /* sleb128 -4 */
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.h.cie.return_column = 8,
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/* Total FDE size does not include the "len" member. */
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.h.fde.len = sizeof(DebugFrame) - offsetof(DebugFrame, h.fde.cie_offset),
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.fde_def_cfa = {
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12, 4, /* DW_CFA_def_cfa %esp, ... */
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(FRAME_SIZE & 0x7f) | 0x80, /* ... uleb128 FRAME_SIZE */
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(FRAME_SIZE >> 7)
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},
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.fde_reg_ofs = {
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0x88, 1, /* DW_CFA_offset, %eip, -4 */
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/* The following ordering must match tcg_target_callee_save_regs. */
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0x85, 2, /* DW_CFA_offset, %ebp, -8 */
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0x83, 3, /* DW_CFA_offset, %ebx, -12 */
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0x86, 4, /* DW_CFA_offset, %esi, -16 */
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0x87, 5, /* DW_CFA_offset, %edi, -20 */
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}
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};
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#endif
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#if defined(ELF_HOST_MACHINE)
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void tcg_register_jit(void *buf, size_t buf_size)
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{
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tcg_register_jit_int(buf, buf_size, &debug_frame, sizeof(debug_frame));
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}
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#endif
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271
qemu/tcg/tcg.c
271
qemu/tcg/tcg.c
@ -2685,274 +2685,3 @@ void tcg_dump_info(FILE *f, fprintf_function cpu_fprintf)
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cpu_fprintf(f, "[TCG profiler not compiled]\n");
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}
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#endif
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#ifdef ELF_HOST_MACHINE
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/* In order to use this feature, the backend needs to do three things:
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(1) Define ELF_HOST_MACHINE to indicate both what value to
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put into the ELF image and to indicate support for the feature.
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(2) Define tcg_register_jit. This should create a buffer containing
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the contents of a .debug_frame section that describes the post-
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prologue unwind info for the tcg machine.
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(3) Call tcg_register_jit_int, with the constructed .debug_frame.
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*/
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/* Begin GDB interface. THE FOLLOWING MUST MATCH GDB DOCS. */
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typedef enum {
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JIT_NOACTION = 0,
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JIT_REGISTER_FN,
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JIT_UNREGISTER_FN
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} jit_actions_t;
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struct jit_code_entry {
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struct jit_code_entry *next_entry;
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struct jit_code_entry *prev_entry;
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const void *symfile_addr;
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uint64_t symfile_size;
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};
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struct jit_descriptor {
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uint32_t version;
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uint32_t action_flag;
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struct jit_code_entry *relevant_entry;
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struct jit_code_entry *first_entry;
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};
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void __jit_debug_register_code(void) __attribute__((noinline));
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void __jit_debug_register_code(void)
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{
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asm("");
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}
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/* Must statically initialize the version, because GDB may check
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the version before we can set it. */
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struct jit_descriptor __jit_debug_descriptor = { 1, 0, 0, 0 };
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/* End GDB interface. */
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static int find_string(const char *strtab, const char *str)
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{
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const char *p = strtab + 1;
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while (1) {
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if (strcmp(p, str) == 0) {
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return p - strtab;
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}
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p += strlen(p) + 1;
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}
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}
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static void tcg_register_jit_int(void *buf_ptr, size_t buf_size,
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const void *debug_frame,
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size_t debug_frame_size)
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{
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struct __attribute__((packed)) DebugInfo {
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uint32_t len;
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uint16_t version;
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uint32_t abbrev;
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uint8_t ptr_size;
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uint8_t cu_die;
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uint16_t cu_lang;
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uintptr_t cu_low_pc;
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uintptr_t cu_high_pc;
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uint8_t fn_die;
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char fn_name[16];
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uintptr_t fn_low_pc;
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uintptr_t fn_high_pc;
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uint8_t cu_eoc;
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};
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struct ElfImage {
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ElfW(Ehdr) ehdr;
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ElfW(Phdr) phdr;
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ElfW(Shdr) shdr[7];
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ElfW(Sym) sym[2];
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struct DebugInfo di;
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uint8_t da[24];
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char str[80];
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};
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struct ElfImage *img;
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static const struct ElfImage img_template = {
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.ehdr = {
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.e_ident[EI_MAG0] = ELFMAG0,
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.e_ident[EI_MAG1] = ELFMAG1,
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.e_ident[EI_MAG2] = ELFMAG2,
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.e_ident[EI_MAG3] = ELFMAG3,
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.e_ident[EI_CLASS] = ELF_CLASS,
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.e_ident[EI_DATA] = ELF_DATA,
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.e_ident[EI_VERSION] = EV_CURRENT,
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.e_type = ET_EXEC,
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.e_machine = ELF_HOST_MACHINE,
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.e_version = EV_CURRENT,
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.e_phoff = offsetof(struct ElfImage, phdr),
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.e_shoff = offsetof(struct ElfImage, shdr),
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.e_ehsize = sizeof(ElfW(Shdr)),
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.e_phentsize = sizeof(ElfW(Phdr)),
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.e_phnum = 1,
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.e_shentsize = sizeof(ElfW(Shdr)),
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.e_shnum = ARRAY_SIZE(img->shdr),
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.e_shstrndx = ARRAY_SIZE(img->shdr) - 1,
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#ifdef ELF_HOST_FLAGS
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.e_flags = ELF_HOST_FLAGS,
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#endif
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#ifdef ELF_OSABI
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.e_ident[EI_OSABI] = ELF_OSABI,
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#endif
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},
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.phdr = {
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.p_type = PT_LOAD,
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.p_flags = PF_X,
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},
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.shdr = {
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[0] = { .sh_type = SHT_NULL },
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/* Trick: The contents of code_gen_buffer are not present in
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this fake ELF file; that got allocated elsewhere. Therefore
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we mark .text as SHT_NOBITS (similar to .bss) so that readers
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will not look for contents. We can record any address. */
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[1] = { /* .text */
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.sh_type = SHT_NOBITS,
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.sh_flags = SHF_EXECINSTR | SHF_ALLOC,
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},
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[2] = { /* .debug_info */
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.sh_type = SHT_PROGBITS,
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.sh_offset = offsetof(struct ElfImage, di),
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.sh_size = sizeof(struct DebugInfo),
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},
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[3] = { /* .debug_abbrev */
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.sh_type = SHT_PROGBITS,
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.sh_offset = offsetof(struct ElfImage, da),
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.sh_size = sizeof(img->da),
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},
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[4] = { /* .debug_frame */
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.sh_type = SHT_PROGBITS,
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.sh_offset = sizeof(struct ElfImage),
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},
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[5] = { /* .symtab */
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.sh_type = SHT_SYMTAB,
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.sh_offset = offsetof(struct ElfImage, sym),
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.sh_size = sizeof(img->sym),
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.sh_info = 1,
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.sh_link = ARRAY_SIZE(img->shdr) - 1,
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.sh_entsize = sizeof(ElfW(Sym)),
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},
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[6] = { /* .strtab */
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.sh_type = SHT_STRTAB,
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.sh_offset = offsetof(struct ElfImage, str),
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.sh_size = sizeof(img->str),
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}
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},
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.sym = {
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[1] = { /* code_gen_buffer */
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.st_info = ELF_ST_INFO(STB_GLOBAL, STT_FUNC),
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.st_shndx = 1,
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}
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},
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.di = {
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.len = sizeof(struct DebugInfo) - 4,
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.version = 2,
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.ptr_size = sizeof(void *),
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.cu_die = 1,
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.cu_lang = 0x8001, /* DW_LANG_Mips_Assembler */
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.fn_die = 2,
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.fn_name = "code_gen_buffer"
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},
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.da = {
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1, /* abbrev number (the cu) */
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0x11, 1, /* DW_TAG_compile_unit, has children */
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0x13, 0x5, /* DW_AT_language, DW_FORM_data2 */
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0x11, 0x1, /* DW_AT_low_pc, DW_FORM_addr */
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0x12, 0x1, /* DW_AT_high_pc, DW_FORM_addr */
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0, 0, /* end of abbrev */
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2, /* abbrev number (the fn) */
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0x2e, 0, /* DW_TAG_subprogram, no children */
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0x3, 0x8, /* DW_AT_name, DW_FORM_string */
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0x11, 0x1, /* DW_AT_low_pc, DW_FORM_addr */
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0x12, 0x1, /* DW_AT_high_pc, DW_FORM_addr */
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0, 0, /* end of abbrev */
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0 /* no more abbrev */
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},
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.str = "\0" ".text\0" ".debug_info\0" ".debug_abbrev\0"
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".debug_frame\0" ".symtab\0" ".strtab\0" "code_gen_buffer",
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};
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/* We only need a single jit entry; statically allocate it. */
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static struct jit_code_entry one_entry;
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uintptr_t buf = (uintptr_t)buf_ptr;
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size_t img_size = sizeof(struct ElfImage) + debug_frame_size;
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DebugFrameHeader *dfh;
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img = g_malloc(img_size);
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*img = img_template;
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img->phdr.p_vaddr = buf;
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img->phdr.p_paddr = buf;
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img->phdr.p_memsz = buf_size;
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img->shdr[1].sh_name = find_string(img->str, ".text");
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img->shdr[1].sh_addr = buf;
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img->shdr[1].sh_size = buf_size;
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img->shdr[2].sh_name = find_string(img->str, ".debug_info");
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img->shdr[3].sh_name = find_string(img->str, ".debug_abbrev");
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img->shdr[4].sh_name = find_string(img->str, ".debug_frame");
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img->shdr[4].sh_size = debug_frame_size;
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img->shdr[5].sh_name = find_string(img->str, ".symtab");
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img->shdr[6].sh_name = find_string(img->str, ".strtab");
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img->sym[1].st_name = find_string(img->str, "code_gen_buffer");
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img->sym[1].st_value = buf;
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img->sym[1].st_size = buf_size;
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img->di.cu_low_pc = buf;
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img->di.cu_high_pc = buf + buf_size;
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img->di.fn_low_pc = buf;
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img->di.fn_high_pc = buf + buf_size;
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dfh = (DebugFrameHeader *)(img + 1);
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memcpy(dfh, debug_frame, debug_frame_size);
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dfh->fde.func_start = buf;
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dfh->fde.func_len = buf_size;
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#ifdef DEBUG_JIT
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/* Enable this block to be able to debug the ELF image file creation.
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One can use readelf, objdump, or other inspection utilities. */
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{
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FILE *f = fopen("/tmp/qemu.jit", "w+b");
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if (f) {
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if (fwrite(img, img_size, 1, f) != img_size) {
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/* Avoid stupid unused return value warning for fwrite. */
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}
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fclose(f);
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}
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}
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#endif
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one_entry.symfile_addr = img;
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one_entry.symfile_size = img_size;
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__jit_debug_descriptor.action_flag = JIT_REGISTER_FN;
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__jit_debug_descriptor.relevant_entry = &one_entry;
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__jit_debug_descriptor.first_entry = &one_entry;
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__jit_debug_register_code();
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}
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#else
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/* No support for the feature. Provide the entry point expected by exec.c,
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and implement the internal function we declared earlier. */
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static void tcg_register_jit_int(void *buf, size_t size,
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const void *debug_frame,
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size_t debug_frame_size)
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{
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}
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void tcg_register_jit(void *buf, size_t buf_size)
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{
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}
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#endif /* ELF_HOST_MACHINE */
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@ -723,7 +723,6 @@ void tcg_exec_init(struct uc_struct *uc, unsigned long tb_size)
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tcg_ctx = uc->tcg_ctx;
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tcg_ctx->code_gen_ptr = tcg_ctx->code_gen_buffer;
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tcg_ctx->uc = uc;
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tcg_register_jit(tcg_ctx->code_gen_buffer, tcg_ctx->code_gen_buffer_size);
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page_init();
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#if !defined(CONFIG_USER_ONLY) || !defined(CONFIG_USE_GUEST_BASE)
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/* There's no guest base to take into account, so go ahead and
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