diff options
Diffstat (limited to 'gdb/ns32k-tdep.c')
| -rw-r--r-- | gdb/ns32k-tdep.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/gdb/ns32k-tdep.c b/gdb/ns32k-tdep.c index 775e8af..7946521 100644 --- a/gdb/ns32k-tdep.c +++ b/gdb/ns32k-tdep.c @@ -64,6 +64,80 @@ umax_skip_prologue (pc) return pc; } +/* Return number of args passed to a frame. + Can return -1, meaning no way to tell. */ + +int +merlin_frame_num_args (fi) + struct frame_info *fi; +{ + int numargs; + CORE_ADDR pc; + int insn; + int addr_mode; + int width; + + pc = FRAME_SAVED_PC (fi); + insn = read_memory_integer (pc,2); + addr_mode = (insn >> 11) & 0x1f; + insn = insn & 0x7ff; + if ((insn & 0x7fc) == 0x57c + && addr_mode == 0x14) /* immediate */ + { + if (insn == 0x57c) /* adjspb */ + width = 1; + else if (insn == 0x57d) /* adjspw */ + width = 2; + else if (insn == 0x57f) /* adjspd */ + width = 4; + numargs = read_memory_integer (pc+2,width); + if (width > 1) + flip_bytes (&numargs, width); + numargs = - sign_extend (numargs, width*8) / 4; + } + else + numargs = -1; + return numargs; +} + +int +umax_frame_num_args (fi) + struct frame_info *fi; +{ + int numargs; + CORE_ADDR pc; + CORE_ADDR enter_addr; + unsigned int insn; + unsigned int addr_mode; + int width; + + numargs = -1; + enter_addr = ns32k_get_enter_addr ((fi)->pc); + if (enter_addr > 0) + { + pc = ((enter_addr == 1) + ? SAVED_PC_AFTER_CALL (fi) + : FRAME_SAVED_PC (fi)); + insn = read_memory_integer (pc,2); + addr_mode = (insn >> 11) & 0x1f; + insn = insn & 0x7ff; + if ((insn & 0x7fc) == 0x57c + && addr_mode == 0x14) /* immediate */ + { + if (insn == 0x57c) /* adjspb */ + width = 1; + else if (insn == 0x57d) /* adjspw */ + width = 2; + else if (insn == 0x57f) /* adjspd */ + width = 4; + numargs = read_memory_integer (pc+2,width); + if (width > 1) + flip_bytes (&numargs, width); + numargs = - sign_extend (numargs, width*8) / 4; + } + } + return numargs; +} sign_extend (value, bits) |