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e612a1f725
Sparc disassembler wants to check previous addresses for some stuff and this may actually cause faults to be generated to the guest if the address is close to page start, because of the function used for the memory access. Fix by changing ldub_code to cpu_memory_rw_debug, which doesn't trigger exceptions. Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
409 lines
11 KiB
C
409 lines
11 KiB
C
/* General "disassemble this chunk" code. Used for debugging. */
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#include "config.h"
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#include "dis-asm.h"
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#include "elf.h"
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#include <errno.h>
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#include "cpu.h"
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#include "exec-all.h"
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#include "disas.h"
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/* Filled in by elfload.c. Simplistic, but will do for now. */
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struct syminfo *syminfos = NULL;
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/* Get LENGTH bytes from info's buffer, at target address memaddr.
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Transfer them to myaddr. */
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int
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buffer_read_memory(bfd_vma memaddr, bfd_byte *myaddr, int length,
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struct disassemble_info *info)
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{
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if (memaddr < info->buffer_vma
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|| memaddr + length > info->buffer_vma + info->buffer_length)
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/* Out of bounds. Use EIO because GDB uses it. */
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return EIO;
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memcpy (myaddr, info->buffer + (memaddr - info->buffer_vma), length);
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return 0;
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}
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/* Get LENGTH bytes from info's buffer, at target address memaddr.
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Transfer them to myaddr. */
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static int
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target_read_memory (bfd_vma memaddr,
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bfd_byte *myaddr,
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int length,
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struct disassemble_info *info)
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{
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cpu_memory_rw_debug(cpu_single_env, memaddr, myaddr, length, 0);
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return 0;
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}
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/* Print an error message. We can assume that this is in response to
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an error return from buffer_read_memory. */
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void
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perror_memory (int status, bfd_vma memaddr, struct disassemble_info *info)
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{
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if (status != EIO)
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/* Can't happen. */
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(*info->fprintf_func) (info->stream, "Unknown error %d\n", status);
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else
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/* Actually, address between memaddr and memaddr + len was
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out of bounds. */
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(*info->fprintf_func) (info->stream,
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"Address 0x%" PRIx64 " is out of bounds.\n", memaddr);
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}
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/* This could be in a separate file, to save miniscule amounts of space
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in statically linked executables. */
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/* Just print the address is hex. This is included for completeness even
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though both GDB and objdump provide their own (to print symbolic
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addresses). */
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void
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generic_print_address (bfd_vma addr, struct disassemble_info *info)
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{
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(*info->fprintf_func) (info->stream, "0x%" PRIx64, addr);
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}
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/* Just return the given address. */
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int
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generic_symbol_at_address (bfd_vma addr, struct disassemble_info *info)
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{
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return 1;
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}
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bfd_vma bfd_getl32 (const bfd_byte *addr)
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{
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unsigned long v;
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v = (unsigned long) addr[0];
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v |= (unsigned long) addr[1] << 8;
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v |= (unsigned long) addr[2] << 16;
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v |= (unsigned long) addr[3] << 24;
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return (bfd_vma) v;
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}
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bfd_vma bfd_getb32 (const bfd_byte *addr)
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{
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unsigned long v;
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v = (unsigned long) addr[0] << 24;
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v |= (unsigned long) addr[1] << 16;
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v |= (unsigned long) addr[2] << 8;
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v |= (unsigned long) addr[3];
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return (bfd_vma) v;
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}
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bfd_vma bfd_getl16 (const bfd_byte *addr)
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{
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unsigned long v;
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v = (unsigned long) addr[0];
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v |= (unsigned long) addr[1] << 8;
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return (bfd_vma) v;
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}
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bfd_vma bfd_getb16 (const bfd_byte *addr)
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{
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unsigned long v;
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v = (unsigned long) addr[0] << 24;
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v |= (unsigned long) addr[1] << 16;
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return (bfd_vma) v;
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}
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#ifdef TARGET_ARM
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static int
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print_insn_thumb1(bfd_vma pc, disassemble_info *info)
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{
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return print_insn_arm(pc | 1, info);
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}
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#endif
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/* Disassemble this for me please... (debugging). 'flags' has the following
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values:
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i386 - nonzero means 16 bit code
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arm - nonzero means thumb code
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ppc - nonzero means little endian
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other targets - unused
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*/
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void target_disas(FILE *out, target_ulong code, target_ulong size, int flags)
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{
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target_ulong pc;
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int count;
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struct disassemble_info disasm_info;
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int (*print_insn)(bfd_vma pc, disassemble_info *info);
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INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
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disasm_info.read_memory_func = target_read_memory;
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disasm_info.buffer_vma = code;
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disasm_info.buffer_length = size;
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#ifdef TARGET_WORDS_BIGENDIAN
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disasm_info.endian = BFD_ENDIAN_BIG;
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#else
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disasm_info.endian = BFD_ENDIAN_LITTLE;
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#endif
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#if defined(TARGET_I386)
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if (flags == 2)
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disasm_info.mach = bfd_mach_x86_64;
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else if (flags == 1)
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disasm_info.mach = bfd_mach_i386_i8086;
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else
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disasm_info.mach = bfd_mach_i386_i386;
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print_insn = print_insn_i386;
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#elif defined(TARGET_ARM)
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if (flags)
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print_insn = print_insn_thumb1;
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else
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print_insn = print_insn_arm;
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#elif defined(TARGET_SPARC)
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print_insn = print_insn_sparc;
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#ifdef TARGET_SPARC64
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disasm_info.mach = bfd_mach_sparc_v9b;
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#endif
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#elif defined(TARGET_PPC)
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if (flags >> 16)
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disasm_info.endian = BFD_ENDIAN_LITTLE;
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if (flags & 0xFFFF) {
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/* If we have a precise definitions of the instructions set, use it */
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disasm_info.mach = flags & 0xFFFF;
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} else {
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#ifdef TARGET_PPC64
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disasm_info.mach = bfd_mach_ppc64;
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#else
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disasm_info.mach = bfd_mach_ppc;
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#endif
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}
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print_insn = print_insn_ppc;
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#elif defined(TARGET_M68K)
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print_insn = print_insn_m68k;
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#elif defined(TARGET_MIPS)
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#ifdef TARGET_WORDS_BIGENDIAN
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print_insn = print_insn_big_mips;
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#else
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print_insn = print_insn_little_mips;
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#endif
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#elif defined(TARGET_SH4)
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disasm_info.mach = bfd_mach_sh4;
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print_insn = print_insn_sh;
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#elif defined(TARGET_ALPHA)
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disasm_info.mach = bfd_mach_alpha;
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print_insn = print_insn_alpha;
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#elif defined(TARGET_CRIS)
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disasm_info.mach = bfd_mach_cris_v32;
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print_insn = print_insn_crisv32;
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#else
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fprintf(out, "0x" TARGET_FMT_lx
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": Asm output not supported on this arch\n", code);
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return;
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#endif
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for (pc = code; size > 0; pc += count, size -= count) {
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fprintf(out, "0x" TARGET_FMT_lx ": ", pc);
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count = print_insn(pc, &disasm_info);
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#if 0
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{
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int i;
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uint8_t b;
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fprintf(out, " {");
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for(i = 0; i < count; i++) {
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target_read_memory(pc + i, &b, 1, &disasm_info);
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fprintf(out, " %02x", b);
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}
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fprintf(out, " }");
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}
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#endif
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fprintf(out, "\n");
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if (count < 0)
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break;
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if (size < count) {
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fprintf(out,
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"Disassembler disagrees with translator over instruction "
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"decoding\n"
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"Please report this to qemu-devel@nongnu.org\n");
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break;
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}
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}
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}
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/* Disassemble this for me please... (debugging). */
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void disas(FILE *out, void *code, unsigned long size)
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{
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unsigned long pc;
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int count;
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struct disassemble_info disasm_info;
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int (*print_insn)(bfd_vma pc, disassemble_info *info);
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INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
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disasm_info.buffer = code;
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disasm_info.buffer_vma = (unsigned long)code;
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disasm_info.buffer_length = size;
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#ifdef WORDS_BIGENDIAN
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disasm_info.endian = BFD_ENDIAN_BIG;
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#else
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disasm_info.endian = BFD_ENDIAN_LITTLE;
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#endif
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#if defined(__i386__)
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disasm_info.mach = bfd_mach_i386_i386;
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print_insn = print_insn_i386;
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#elif defined(__x86_64__)
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disasm_info.mach = bfd_mach_x86_64;
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print_insn = print_insn_i386;
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#elif defined(_ARCH_PPC)
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print_insn = print_insn_ppc;
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#elif defined(__alpha__)
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print_insn = print_insn_alpha;
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#elif defined(__sparc__)
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print_insn = print_insn_sparc;
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#if defined(__sparc_v8plus__) || defined(__sparc_v8plusa__) || defined(__sparc_v9__)
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disasm_info.mach = bfd_mach_sparc_v9b;
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#endif
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#elif defined(__arm__)
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print_insn = print_insn_arm;
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#elif defined(__MIPSEB__)
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print_insn = print_insn_big_mips;
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#elif defined(__MIPSEL__)
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print_insn = print_insn_little_mips;
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#elif defined(__m68k__)
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print_insn = print_insn_m68k;
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#elif defined(__s390__)
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print_insn = print_insn_s390;
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#elif defined(__hppa__)
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print_insn = print_insn_hppa;
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#else
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fprintf(out, "0x%lx: Asm output not supported on this arch\n",
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(long) code);
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return;
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#endif
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for (pc = (unsigned long)code; size > 0; pc += count, size -= count) {
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fprintf(out, "0x%08lx: ", pc);
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#ifdef __arm__
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/* since data is included in the code, it is better to
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display code data too */
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fprintf(out, "%08x ", (int)bfd_getl32((const bfd_byte *)pc));
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#endif
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count = print_insn(pc, &disasm_info);
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fprintf(out, "\n");
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if (count < 0)
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break;
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}
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}
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/* Look up symbol for debugging purpose. Returns "" if unknown. */
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const char *lookup_symbol(target_ulong orig_addr)
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{
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const char *symbol = "";
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struct syminfo *s;
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for (s = syminfos; s; s = s->next) {
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symbol = s->lookup_symbol(s, orig_addr);
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if (symbol[0] != '\0') {
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break;
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}
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}
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return symbol;
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}
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#if !defined(CONFIG_USER_ONLY)
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#include "monitor.h"
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static int monitor_disas_is_physical;
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static CPUState *monitor_disas_env;
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static int
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monitor_read_memory (bfd_vma memaddr, bfd_byte *myaddr, int length,
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struct disassemble_info *info)
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{
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if (monitor_disas_is_physical) {
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cpu_physical_memory_rw(memaddr, myaddr, length, 0);
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} else {
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cpu_memory_rw_debug(monitor_disas_env, memaddr,myaddr, length, 0);
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}
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return 0;
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}
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static int monitor_fprintf(FILE *stream, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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monitor_vprintf((Monitor *)stream, fmt, ap);
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va_end(ap);
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return 0;
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}
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void monitor_disas(Monitor *mon, CPUState *env,
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target_ulong pc, int nb_insn, int is_physical, int flags)
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{
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int count, i;
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struct disassemble_info disasm_info;
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int (*print_insn)(bfd_vma pc, disassemble_info *info);
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INIT_DISASSEMBLE_INFO(disasm_info, (FILE *)mon, monitor_fprintf);
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monitor_disas_env = env;
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monitor_disas_is_physical = is_physical;
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disasm_info.read_memory_func = monitor_read_memory;
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disasm_info.buffer_vma = pc;
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#ifdef TARGET_WORDS_BIGENDIAN
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disasm_info.endian = BFD_ENDIAN_BIG;
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#else
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disasm_info.endian = BFD_ENDIAN_LITTLE;
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#endif
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#if defined(TARGET_I386)
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if (flags == 2)
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disasm_info.mach = bfd_mach_x86_64;
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else if (flags == 1)
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disasm_info.mach = bfd_mach_i386_i8086;
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else
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disasm_info.mach = bfd_mach_i386_i386;
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print_insn = print_insn_i386;
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#elif defined(TARGET_ARM)
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print_insn = print_insn_arm;
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#elif defined(TARGET_ALPHA)
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print_insn = print_insn_alpha;
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#elif defined(TARGET_SPARC)
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print_insn = print_insn_sparc;
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#ifdef TARGET_SPARC64
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disasm_info.mach = bfd_mach_sparc_v9b;
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#endif
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#elif defined(TARGET_PPC)
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#ifdef TARGET_PPC64
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disasm_info.mach = bfd_mach_ppc64;
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#else
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disasm_info.mach = bfd_mach_ppc;
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#endif
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print_insn = print_insn_ppc;
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#elif defined(TARGET_M68K)
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print_insn = print_insn_m68k;
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#elif defined(TARGET_MIPS)
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#ifdef TARGET_WORDS_BIGENDIAN
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print_insn = print_insn_big_mips;
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#else
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print_insn = print_insn_little_mips;
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#endif
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#else
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monitor_printf(mon, "0x" TARGET_FMT_lx
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": Asm output not supported on this arch\n", pc);
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return;
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#endif
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for(i = 0; i < nb_insn; i++) {
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monitor_printf(mon, "0x" TARGET_FMT_lx ": ", pc);
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count = print_insn(pc, &disasm_info);
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monitor_printf(mon, "\n");
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if (count < 0)
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break;
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pc += count;
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}
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}
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#endif
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