From 413f05aaf54fa08c0ae7e997327a4f4a473c0a8d Mon Sep 17 00:00:00 2001 From: Upstream Date: Mon, 12 Jan 1970 13:46:40 +0000 Subject: external/qemu 0.8.2 --- disas.c | 413 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 413 insertions(+) create mode 100644 disas.c (limited to 'disas.c') diff --git a/disas.c b/disas.c new file mode 100644 index 0000000..fd91b92 --- /dev/null +++ b/disas.c @@ -0,0 +1,413 @@ +/* General "disassemble this chunk" code. Used for debugging. */ +#include "config.h" +#include "dis-asm.h" +#include "elf.h" +#include + +#include "cpu.h" +#include "exec-all.h" +#include "disas.h" + +/* Filled in by elfload.c. Simplistic, but will do for now. */ +struct syminfo *syminfos = NULL; + +/* Get LENGTH bytes from info's buffer, at target address memaddr. + Transfer them to myaddr. */ +int +buffer_read_memory (memaddr, myaddr, length, info) + bfd_vma memaddr; + bfd_byte *myaddr; + int length; + struct disassemble_info *info; +{ + if (memaddr < info->buffer_vma + || memaddr + length > info->buffer_vma + info->buffer_length) + /* Out of bounds. Use EIO because GDB uses it. */ + return EIO; + memcpy (myaddr, info->buffer + (memaddr - info->buffer_vma), length); + return 0; +} + +/* Get LENGTH bytes from info's buffer, at target address memaddr. + Transfer them to myaddr. */ +static int +target_read_memory (bfd_vma memaddr, + bfd_byte *myaddr, + int length, + struct disassemble_info *info) +{ + int i; + for(i = 0; i < length; i++) { + myaddr[i] = ldub_code(memaddr + i); + } + return 0; +} + +/* Print an error message. We can assume that this is in response to + an error return from buffer_read_memory. */ +void +perror_memory (status, memaddr, info) + int status; + bfd_vma memaddr; + struct disassemble_info *info; +{ + if (status != EIO) + /* Can't happen. */ + (*info->fprintf_func) (info->stream, "Unknown error %d\n", status); + else + /* Actually, address between memaddr and memaddr + len was + out of bounds. */ + (*info->fprintf_func) (info->stream, + "Address 0x%" PRIx64 " is out of bounds.\n", memaddr); +} + +/* This could be in a separate file, to save miniscule amounts of space + in statically linked executables. */ + +/* Just print the address is hex. This is included for completeness even + though both GDB and objdump provide their own (to print symbolic + addresses). */ + +void +generic_print_address (addr, info) + bfd_vma addr; + struct disassemble_info *info; +{ + (*info->fprintf_func) (info->stream, "0x%" PRIx64, addr); +} + +/* Just return the given address. */ + +int +generic_symbol_at_address (addr, info) + bfd_vma addr; + struct disassemble_info * info; +{ + return 1; +} + +bfd_vma bfd_getl32 (const bfd_byte *addr) +{ + unsigned long v; + + v = (unsigned long) addr[0]; + v |= (unsigned long) addr[1] << 8; + v |= (unsigned long) addr[2] << 16; + v |= (unsigned long) addr[3] << 24; + return (bfd_vma) v; +} + +bfd_vma bfd_getb32 (const bfd_byte *addr) +{ + unsigned long v; + + v = (unsigned long) addr[0] << 24; + v |= (unsigned long) addr[1] << 16; + v |= (unsigned long) addr[2] << 8; + v |= (unsigned long) addr[3]; + return (bfd_vma) v; +} + +bfd_vma bfd_getl16 (const bfd_byte *addr) +{ + unsigned long v; + + v = (unsigned long) addr[0]; + v |= (unsigned long) addr[1] << 8; + return (bfd_vma) v; +} + +bfd_vma bfd_getb16 (const bfd_byte *addr) +{ + unsigned long v; + + v = (unsigned long) addr[0] << 24; + v |= (unsigned long) addr[1] << 16; + return (bfd_vma) v; +} + +#ifdef TARGET_ARM +static int +print_insn_thumb1(bfd_vma pc, disassemble_info *info) +{ + return print_insn_arm(pc | 1, info); +} +#endif + +/* Disassemble this for me please... (debugging). 'flags' has teh following + values: + i386 - nonzero means 16 bit code + arm - nonzero means thumb code + ppc - nonzero means little endian + other targets - unused + */ +void target_disas(FILE *out, target_ulong code, target_ulong size, int flags) +{ + target_ulong pc; + int count; + struct disassemble_info disasm_info; + int (*print_insn)(bfd_vma pc, disassemble_info *info); + + INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf); + + disasm_info.read_memory_func = target_read_memory; + disasm_info.buffer_vma = code; + disasm_info.buffer_length = size; + +#ifdef TARGET_WORDS_BIGENDIAN + disasm_info.endian = BFD_ENDIAN_BIG; +#else + disasm_info.endian = BFD_ENDIAN_LITTLE; +#endif +#if defined(TARGET_I386) + if (flags == 2) + disasm_info.mach = bfd_mach_x86_64; + else if (flags == 1) + disasm_info.mach = bfd_mach_i386_i8086; + else + disasm_info.mach = bfd_mach_i386_i386; + print_insn = print_insn_i386; +#elif defined(TARGET_ARM) + if (flags) + print_insn = print_insn_thumb1; + else + print_insn = print_insn_arm; +#elif defined(TARGET_SPARC) + print_insn = print_insn_sparc; +#ifdef TARGET_SPARC64 + disasm_info.mach = bfd_mach_sparc_v9b; +#endif +#elif defined(TARGET_PPC) + if (flags) + disasm_info.endian = BFD_ENDIAN_LITTLE; +#ifdef TARGET_PPC64 + disasm_info.mach = bfd_mach_ppc64; +#else + disasm_info.mach = bfd_mach_ppc; +#endif + print_insn = print_insn_ppc; +#elif defined(TARGET_MIPS) +#ifdef TARGET_WORDS_BIGENDIAN + print_insn = print_insn_big_mips; +#else + print_insn = print_insn_little_mips; +#endif +#elif defined(TARGET_M68K) + print_insn = print_insn_m68k; +#elif defined(TARGET_SH4) + disasm_info.mach = bfd_mach_sh4; + print_insn = print_insn_sh; +#else + fprintf(out, "0x" TARGET_FMT_lx + ": Asm output not supported on this arch\n", code); + return; +#endif + + for (pc = code; pc < code + size; pc += count) { + fprintf(out, "0x" TARGET_FMT_lx ": ", pc); + count = print_insn(pc, &disasm_info); +#if 0 + { + int i; + uint8_t b; + fprintf(out, " {"); + for(i = 0; i < count; i++) { + target_read_memory(pc + i, &b, 1, &disasm_info); + fprintf(out, " %02x", b); + } + fprintf(out, " }"); + } +#endif + fprintf(out, "\n"); + if (count < 0) + break; + } +} + +/* Disassemble this for me please... (debugging). */ +void disas(FILE *out, void *code, unsigned long size) +{ + unsigned long pc; + int count; + struct disassemble_info disasm_info; + int (*print_insn)(bfd_vma pc, disassemble_info *info); + + INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf); + + disasm_info.buffer = code; + disasm_info.buffer_vma = (unsigned long)code; + disasm_info.buffer_length = size; + +#ifdef WORDS_BIGENDIAN + disasm_info.endian = BFD_ENDIAN_BIG; +#else + disasm_info.endian = BFD_ENDIAN_LITTLE; +#endif +#if defined(__i386__) + disasm_info.mach = bfd_mach_i386_i386; + print_insn = print_insn_i386; +#elif defined(__x86_64__) + disasm_info.mach = bfd_mach_x86_64; + print_insn = print_insn_i386; +#elif defined(__powerpc__) + print_insn = print_insn_ppc; +#elif defined(__alpha__) + print_insn = print_insn_alpha; +#elif defined(__sparc__) + print_insn = print_insn_sparc; +#elif defined(__arm__) + print_insn = print_insn_arm; +#elif defined(__MIPSEB__) + print_insn = print_insn_big_mips; +#elif defined(__MIPSEL__) + print_insn = print_insn_little_mips; +#elif defined(__m68k__) + print_insn = print_insn_m68k; +#else + fprintf(out, "0x%lx: Asm output not supported on this arch\n", + (long) code); + return; +#endif + for (pc = (unsigned long)code; pc < (unsigned long)code + size; pc += count) { + fprintf(out, "0x%08lx: ", pc); +#ifdef __arm__ + /* since data are included in the code, it is better to + display code data too */ + if (is_host) { + fprintf(out, "%08x ", (int)bfd_getl32((const bfd_byte *)pc)); + } +#endif + count = print_insn(pc, &disasm_info); + fprintf(out, "\n"); + if (count < 0) + break; + } +} + +/* Look up symbol for debugging purpose. Returns "" if unknown. */ +const char *lookup_symbol(target_ulong orig_addr) +{ + unsigned int i; + /* Hack, because we know this is x86. */ + Elf32_Sym *sym; + struct syminfo *s; + target_ulong addr; + + for (s = syminfos; s; s = s->next) { + sym = s->disas_symtab; + for (i = 0; i < s->disas_num_syms; i++) { + if (sym[i].st_shndx == SHN_UNDEF + || sym[i].st_shndx >= SHN_LORESERVE) + continue; + + if (ELF_ST_TYPE(sym[i].st_info) != STT_FUNC) + continue; + + addr = sym[i].st_value; +#ifdef TARGET_ARM + /* The bottom address bit marks a Thumb symbol. */ + addr &= ~(target_ulong)1; +#endif + if (orig_addr >= addr + && orig_addr < addr + sym[i].st_size) + return s->disas_strtab + sym[i].st_name; + } + } + return ""; +} + +#if !defined(CONFIG_USER_ONLY) + +void term_vprintf(const char *fmt, va_list ap); +void term_printf(const char *fmt, ...); + +static int monitor_disas_is_physical; +static CPUState *monitor_disas_env; + +static int +monitor_read_memory (memaddr, myaddr, length, info) + bfd_vma memaddr; + bfd_byte *myaddr; + int length; + struct disassemble_info *info; +{ + if (monitor_disas_is_physical) { + cpu_physical_memory_rw(memaddr, myaddr, length, 0); + } else { + cpu_memory_rw_debug(monitor_disas_env, memaddr,myaddr, length, 0); + } + return 0; +} + +static int monitor_fprintf(FILE *stream, const char *fmt, ...) +{ + va_list ap; + va_start(ap, fmt); + term_vprintf(fmt, ap); + va_end(ap); + return 0; +} + +void monitor_disas(CPUState *env, + target_ulong pc, int nb_insn, int is_physical, int flags) +{ + int count, i; + struct disassemble_info disasm_info; + int (*print_insn)(bfd_vma pc, disassemble_info *info); + + INIT_DISASSEMBLE_INFO(disasm_info, NULL, monitor_fprintf); + + monitor_disas_env = env; + monitor_disas_is_physical = is_physical; + disasm_info.read_memory_func = monitor_read_memory; + + disasm_info.buffer_vma = pc; + +#ifdef TARGET_WORDS_BIGENDIAN + disasm_info.endian = BFD_ENDIAN_BIG; +#else + disasm_info.endian = BFD_ENDIAN_LITTLE; +#endif +#if defined(TARGET_I386) + if (flags == 2) + disasm_info.mach = bfd_mach_x86_64; + else if (flags == 1) + disasm_info.mach = bfd_mach_i386_i8086; + else + disasm_info.mach = bfd_mach_i386_i386; + print_insn = print_insn_i386; +#elif defined(TARGET_ARM) + print_insn = print_insn_arm; +#elif defined(TARGET_SPARC) + print_insn = print_insn_sparc; +#elif defined(TARGET_PPC) +#ifdef TARGET_PPC64 + disasm_info.mach = bfd_mach_ppc64; +#else + disasm_info.mach = bfd_mach_ppc; +#endif + print_insn = print_insn_ppc; +#elif defined(TARGET_MIPS) +#ifdef TARGET_WORDS_BIGENDIAN + print_insn = print_insn_big_mips; +#else + print_insn = print_insn_little_mips; +#endif +#elif defined(TARGET_M68K) + print_insn = print_insn_m68k; +#else + term_printf("0x" TARGET_FMT_lx + ": Asm output not supported on this arch\n", pc); + return; +#endif + + for(i = 0; i < nb_insn; i++) { + term_printf("0x" TARGET_FMT_lx ": ", pc); + count = print_insn(pc, &disasm_info); + term_printf("\n"); + if (count < 0) + break; + pc += count; + } +} +#endif -- cgit v1.1