From 9608051a0eba6303adcadff7d09b70a36067fba3 Mon Sep 17 00:00:00 2001 From: Yao Qi Date: Fri, 13 Jan 2017 12:27:39 +0000 Subject: [PATCH] Return -1 on memory error in print_insn_m68k m68k-dis.c:print_insn_m68k doesn't return -1 on memory error, but GDB expects it returning -1 on memory error. opcodes: 2017-01-13 Yao Qi * m68k-dis.c (match_insn_m68k): Extend comments. Return -1 if FETCH_DATA returns 0. (m68k_scan_mask): Likewise. (print_insn_m68k): Update code to handle -1 return value. --- opcodes/ChangeLog | 7 +++++++ opcodes/m68k-dis.c | 19 ++++++++++++------- 2 files changed, 19 insertions(+), 7 deletions(-) diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog index 0adbdf1cb15..d4f35bdaf0c 100644 --- a/opcodes/ChangeLog +++ b/opcodes/ChangeLog @@ -1,3 +1,10 @@ +2017-01-13 Yao Qi + + * m68k-dis.c (match_insn_m68k): Extend comments. Return -1 + if FETCH_DATA returns 0. + (m68k_scan_mask): Likewise. + (print_insn_m68k): Update code to handle -1 return value. + 2017-01-13 Yao Qi * m68k-dis.c (enum print_insn_arg_error): New. diff --git a/opcodes/m68k-dis.c b/opcodes/m68k-dis.c index a14db9a1f6a..345c66bdd6a 100644 --- a/opcodes/m68k-dis.c +++ b/opcodes/m68k-dis.c @@ -1331,7 +1331,8 @@ print_insn_arg (const char *d, } /* Try to match the current instruction to best and if so, return the - number of bytes consumed from the instruction stream, else zero. */ + number of bytes consumed from the instruction stream, else zero. + Return -1 on memory error. */ static int match_insn_m68k (bfd_vma memaddr, @@ -1415,12 +1416,14 @@ match_insn_m68k (bfd_vma memaddr, this because we know exactly what the second word is, and we aren't going to print anything based on it. */ p = buffer + 6; - FETCH_DATA (info, p); + if (!FETCH_DATA (info, p)) + return -1; buffer[2] = buffer[4]; buffer[3] = buffer[5]; } - FETCH_DATA (info, p); + if (!FETCH_DATA (info, p)) + return -1; save_p = p; info->print_address_func = dummy_print_address; @@ -1439,7 +1442,7 @@ match_insn_m68k (bfd_vma memaddr, { info->fprintf_func = save_printer; info->print_address_func = save_print_address; - return 0; + return eaten == PRINT_INSN_ARG_MEMORY_ERROR ? -1 : 0; } else { @@ -1481,7 +1484,8 @@ match_insn_m68k (bfd_vma memaddr, /* Try to interpret the instruction at address MEMADDR as one that can execute on a processor with the features given by ARCH_MASK. If successful, print the instruction to INFO->STREAM and return - its length in bytes. Return 0 otherwise. */ + its length in bytes. Return 0 otherwise. Return -1 on memory + error. */ static int m68k_scan_mask (bfd_vma memaddr, disassemble_info *info, @@ -1523,7 +1527,8 @@ m68k_scan_mask (bfd_vma memaddr, disassemble_info *info, *opc_pointer[(m68k_opcodes[i].opcode >> 28) & 15]++ = &m68k_opcodes[i]; } - FETCH_DATA (info, buffer + 2); + if (!FETCH_DATA (info, buffer + 2)) + return -1; major_opcode = (buffer[0] >> 4) & 15; for (i = 0; i < numopcodes[major_opcode]; i++) @@ -1628,7 +1633,7 @@ print_insn_m68k (bfd_vma memaddr, disassemble_info *info) /* First try printing an m680x0 instruction. Try printing a Coldfire one if that fails. */ val = m68k_scan_mask (memaddr, info, m68k_mask); - if (val == 0) + if (val <= 0) val = m68k_scan_mask (memaddr, info, mcf_mask); } else -- 2.30.2