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Diffstat (limited to 'gdb/symm-tdep.c')
| -rw-r--r-- | gdb/symm-tdep.c | 494 |
1 files changed, 494 insertions, 0 deletions
diff --git a/gdb/symm-tdep.c b/gdb/symm-tdep.c new file mode 100644 index 0000000..aba21c3 --- /dev/null +++ b/gdb/symm-tdep.c @@ -0,0 +1,494 @@ +/* Sequent Symmetry target interface, for GDB when running under Unix. + Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc. + +This file is part of GDB. + +GDB is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 1, or (at your option) +any later version. + +GDB is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GDB; see the file COPYING. If not, write to +the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* many 387-specific items of use taken from i386-dep.c */ + +#include <stdio.h> +#include "defs.h" +#include "param.h" +#include "frame.h" +#include "inferior.h" +#include "symtab.h" + +#include <signal.h> +#include <sys/param.h> +#include <sys/user.h> +#include <sys/dir.h> +#include <sys/ioctl.h> +#include <sys/stat.h> +#include "gdbcore.h" +#include <fcntl.h> + +static long i386_get_frame_setup (); +static i386_follow_jump (); + +#include <sgtty.h> +#define TERMINAL struct sgttyb + +exec_file_command (filename, from_tty) + char *filename; + int from_tty; +{ + int val; + + /* Eliminate all traces of old exec file. + Mark text segment as empty. */ + + if (execfile) + free (execfile); + execfile = 0; + data_start = 0; + data_end -= exec_data_start; + text_start = 0; + text_end = 0; + exec_data_start = 0; + exec_data_end = 0; + if (execchan >= 0) + close (execchan); + execchan = -1; + + /* Now open and digest the file the user requested, if any. */ + + if (filename) + { + filename = tilde_expand (filename); + make_cleanup (free, filename); + + execchan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, + &execfile); + if (execchan < 0) + perror_with_name (filename); + +#ifdef COFF_FORMAT + { + int aout_hdrsize; + int num_sections; + + if (read_file_hdr (execchan, &file_hdr) < 0) + error ("\"%s\": not in executable format.", execfile); + + aout_hdrsize = file_hdr.f_opthdr; + num_sections = file_hdr.f_nscns; + + if (read_aout_hdr (execchan, &exec_aouthdr, aout_hdrsize) < 0) + error ("\"%s\": can't read optional aouthdr", execfile); + + if (read_section_hdr (execchan, _TEXT, &text_hdr, num_sections, + aout_hdrsize) < 0) + error ("\"%s\": can't read text section header", execfile); + + if (read_section_hdr (execchan, _DATA, &data_hdr, num_sections, + aout_hdrsize) < 0) + error ("\"%s\": can't read data section header", execfile); + + text_start = exec_aouthdr.text_start; + text_end = text_start + exec_aouthdr.tsize; + text_offset = text_hdr.s_scnptr; + exec_data_start = exec_aouthdr.data_start; + exec_data_end = exec_data_start + exec_aouthdr.dsize; + exec_data_offset = data_hdr.s_scnptr; + data_start = exec_data_start; + data_end += exec_data_start; + exec_mtime = file_hdr.f_timdat; + } +#else /* not COFF_FORMAT */ + { + struct stat st_exec; + + val = myread (execchan, &exec_aouthdr, sizeof (AOUTHDR)); + + if (val < 0) + perror_with_name (filename); + + text_start = N_ADDRADJ(exec_aouthdr); + exec_data_start = round(exec_aouthdr.a_text, NBPG*CLSIZE); + text_offset = N_TXTOFF (exec_aouthdr); + exec_data_offset = N_TXTOFF (exec_aouthdr) + exec_aouthdr.a_text; + text_end = exec_aouthdr.a_text; + exec_data_end = exec_data_start + exec_aouthdr.a_data; + data_start = exec_data_start; + data_end = data_start + exec_aouthdr.a_data; + exec_data_offset = N_TXTOFF(exec_aouthdr); + fstat (execchan, &st_exec); + exec_mtime = st_exec.st_mtime; + } +#endif /* not COFF_FORMAT */ + + validate_files (); + } + else if (from_tty) + printf ("No exec file now.\n"); + + /* Tell display code (if any) about the changed file name. */ + if (exec_file_display_hook) + (*exec_file_display_hook) (filename); +} + +/* rounds 'one' up to divide evenly by 'two' */ + +int +round(one,two) +register int one, two; + +{ + register int temp; + temp = (one/two)*two; + if (one != temp) { + temp += two; + } + return temp; +} + + +static CORE_ADDR codestream_next_addr; +static CORE_ADDR codestream_addr; +static unsigned char codestream_buf[sizeof (int)]; +static int codestream_off; +static int codestream_cnt; + +#define codestream_tell() (codestream_addr + codestream_off) +#define codestream_peek() (codestream_cnt == 0 ? \ + codestream_fill(1): codestream_buf[codestream_off]) +#define codestream_get() (codestream_cnt-- == 0 ? \ + codestream_fill(0) : codestream_buf[codestream_off++]) + + +static unsigned char +codestream_fill (peek_flag) +{ + codestream_addr = codestream_next_addr; + codestream_next_addr += sizeof (int); + codestream_off = 0; + codestream_cnt = sizeof (int); + read_memory (codestream_addr, + (unsigned char *)codestream_buf, + sizeof (int)); + + if (peek_flag) + return (codestream_peek()); + else + return (codestream_get()); +} + +static void +codestream_seek (place) +{ + codestream_next_addr = place & -sizeof (int); + codestream_cnt = 0; + codestream_fill (1); + while (codestream_tell() != place) + codestream_get (); +} + +static void +codestream_read (buf, count) + unsigned char *buf; +{ + unsigned char *p; + int i; + p = buf; + for (i = 0; i < count; i++) + *p++ = codestream_get (); +} + +/* + * Following macro translates i386 opcode register numbers to Symmetry + * register numbers. This is used by FRAME_FIND_SAVED_REGS. + * + * %eax %ecx %edx %ebx %esp %ebp %esi %edi + * i386 0 1 2 3 4 5 6 7 + * Symmetry 0 2 1 5 14 15 6 7 + * + */ +#define I386_REGNO_TO_SYMMETRY(n) \ +((n)==0?0 :(n)==1?2 :(n)==2?1 :(n)==3?5 :(n)==4?14 :(n)==5?15 :(n)) + +/* from i386-dep.c */ +i386_frame_find_saved_regs (fip, fsrp) + struct frame_info *fip; + struct frame_saved_regs *fsrp; +{ + unsigned long locals; + unsigned char *p; + unsigned char op; + CORE_ADDR dummy_bottom; + CORE_ADDR adr; + int i; + + bzero (fsrp, sizeof *fsrp); + + /* if frame is the end of a dummy, compute where the + * beginning would be + */ + dummy_bottom = fip->frame - 4 - NUM_REGS*4 - CALL_DUMMY_LENGTH; + + /* check if the PC is in the stack, in a dummy frame */ + if (dummy_bottom <= fip->pc && fip->pc <= fip->frame) + { + /* all regs were saved by push_call_dummy () */ + adr = fip->frame - 4; + for (i = 0; i < NUM_REGS; i++) + { + fsrp->regs[i] = adr; + adr -= 4; + } + return; + } + + locals = i386_get_frame_setup (get_pc_function_start (fip->pc)); + + if (locals >= 0) + { + adr = fip->frame - 4 - locals; + for (i = 0; i < 8; i++) + { + op = codestream_get (); + if (op < 0x50 || op > 0x57) + break; + fsrp->regs[I386_REGNO_TO_SYMMETRY(op - 0x50)] = adr; + adr -= 4; + } + } + + fsrp->regs[PC_REGNUM] = fip->frame + 4; + fsrp->regs[FP_REGNUM] = fip->frame; +} + +static long +i386_get_frame_setup (pc) +{ + unsigned char op; + + codestream_seek (pc); + + i386_follow_jump (); + + op = codestream_get (); + + if (op == 0x58) /* popl %eax */ + { + /* + * this function must start with + * + * popl %eax 0x58 + * xchgl %eax, (%esp) 0x87 0x04 0x24 + * or xchgl %eax, 0(%esp) 0x87 0x44 0x24 0x00 + * + * (the system 5 compiler puts out the second xchg + * inst, and the assembler doesn't try to optimize it, + * so the 'sib' form gets generated) + * + * this sequence is used to get the address of the return + * buffer for a function that returns a structure + */ + int pos; + unsigned char buf[4]; + static unsigned char proto1[3] = { 0x87,0x04,0x24 }; + static unsigned char proto2[4] = { 0x87,0x44,0x24,0x00 }; + pos = codestream_tell (); + codestream_read (buf, 4); + if (bcmp (buf, proto1, 3) == 0) + pos += 3; + else if (bcmp (buf, proto2, 4) == 0) + pos += 4; + + codestream_seek (pos); + op = codestream_get (); /* update next opcode */ + } + + if (op == 0x55) /* pushl %esp */ + { + if (codestream_get () != 0x8b) /* movl %esp, %ebp (2bytes) */ + return (-1); + if (codestream_get () != 0xec) + return (-1); + /* + * check for stack adjustment + * + * subl $XXX, %esp + * + * note: you can't subtract a 16 bit immediate + * from a 32 bit reg, so we don't have to worry + * about a data16 prefix + */ + op = codestream_peek (); + if (op == 0x83) /* subl with 8 bit immed */ + { + codestream_get (); + if (codestream_get () != 0xec) + return (-1); + /* subl with signed byte immediate + * (though it wouldn't make sense to be negative) + */ + return (codestream_get()); + } + else if (op == 0x81) /* subl with 32 bit immed */ + { + int locals; + if (codestream_get () != 0xec) + return (-1); + /* subl with 32 bit immediate */ + codestream_read ((unsigned char *)&locals, 4); + return (locals); + } + else + { + return (0); + } + } + else if (op == 0xc8) + { + /* enter instruction: arg is 16 unsigned immed */ + unsigned short slocals; + codestream_read ((unsigned char *)&slocals, 2); + codestream_get (); /* flush final byte of enter instruction */ + return (slocals); + } + return (-1); +} + +/* next instruction is a jump, move to target */ +static +i386_follow_jump () +{ + int long_delta; + short short_delta; + char byte_delta; + int data16; + int pos; + + pos = codestream_tell (); + + data16 = 0; + if (codestream_peek () == 0x66) + { + codestream_get (); + data16 = 1; + } + + switch (codestream_get ()) + { + case 0xe9: + /* relative jump: if data16 == 0, disp32, else disp16 */ + if (data16) + { + codestream_read ((unsigned char *)&short_delta, 2); + pos += short_delta + 3; /* include size of jmp inst */ + } + else + { + codestream_read ((unsigned char *)&long_delta, 4); + pos += long_delta + 5; + } + break; + case 0xeb: + /* relative jump, disp8 (ignore data16) */ + codestream_read ((unsigned char *)&byte_delta, 1); + pos += byte_delta + 2; + break; + } + codestream_seek (pos + data16); +} + +/* return pc of first real instruction */ +/* from i386-dep.c */ + +i386_skip_prologue (pc) +{ + unsigned char op; + int i; + + if (i386_get_frame_setup (pc) < 0) + return (pc); + + /* found valid frame setup - codestream now points to + * start of push instructions for saving registers + */ + + /* skip over register saves */ + for (i = 0; i < 8; i++) + { + op = codestream_peek (); + /* break if not pushl inst */ + if (op < 0x50 || op > 0x57) + break; + codestream_get (); + } + + i386_follow_jump (); + + return (codestream_tell ()); +} + +symmetry_extract_return_value(type, regbuf, valbuf) + struct type *type; + char *regbuf; + char *valbuf; +{ + union { + double d; + int l[2]; + } xd; + int i; + float f; + + if (TYPE_CODE_FLT == TYPE_CODE(type)) { + for (i = 0; i < misc_function_count; i++) { + if (!strcmp(misc_function_vector[i].name, "1167_flt")) + break; + } + if (i < misc_function_count) { + /* found "1167_flt" means 1167, %fp2-%fp3 */ + /* float & double; 19= %fp2, 20= %fp3 */ + /* no single precision on 1167 */ + xd.l[1] = *((int *)®buf[REGISTER_BYTE(19)]); + xd.l[0] = *((int *)®buf[REGISTER_BYTE(20)]); + switch (TYPE_LENGTH(type)) { + case 4: + f = (float) xd.d; + bcopy(&f, valbuf, TYPE_LENGTH(type)); + break; + case 8: + bcopy(&xd.d, valbuf, TYPE_LENGTH(type)); + break; + default: + error("Unknown floating point size"); + break; + } + } else { + /* 387 %st(0), gcc uses this */ + i387_to_double(((int *)®buf[REGISTER_BYTE(3)]), + &xd.d); + switch (TYPE_LENGTH(type)) { + case 4: /* float */ + f = (float) xd.d; + bcopy(&f, valbuf, 4); + break; + case 8: /* double */ + bcopy(&xd.d, valbuf, 8); + break; + default: + error("Unknown floating point size"); + break; + } + } + } else { + bcopy (regbuf, valbuf, TYPE_LENGTH (type)); + } +} |