* remote-mips.c: New file; implements MIPS remote debugging
protocol. * config/idt.mt: New file; uses remote-mips.c * configure.in (mips-idt-ecoff): New target; uses idt.mt. * mips-tdep.c (mips_fpu): New variable; controls use of MIPS floating point coprocessor. (mips_push_dummy_frame): If not mips_fpu, don't save floating point registers. (mips_pop_frame): If not mips_fpu, don't restore floating point registers. (_initialize_mips_tdep): New function; let the user reset mips_fpu variable. * tm-mips.h (EXTRACT_RETURN_VALUE, STORE_RETURN_VALUE): If not mips_fpu, don't use fp0 as floating point return register. (FIX_CALL_DUMMY): If not mips_fpu, don't save floating point registers. Also added remote-mips.c to .Sanitize file.
This commit is contained in:
Ian Lance Taylor
parent
20f10b59ff
commit
c2a0f1cb8e
8 changed files with 260 additions and 55 deletions
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@ -1,5 +1,5 @@
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/* Target-dependent code for the MIPS architecture, for GDB, the GNU Debugger.
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Copyright 1988, 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
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Copyright 1988, 1989, 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
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Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
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and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
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@ -55,6 +55,10 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <sys/stat.h>
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/* Some MIPS boards don't support floating point, so we permit the
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user to turn it off. */
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int mips_fpu = 1;
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#define PROC_LOW_ADDR(proc) ((proc)->pdr.adr) /* least address */
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#define PROC_HIGH_ADDR(proc) ((proc)->pdr.iline) /* upper address bound */
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#define PROC_FRAME_OFFSET(proc) ((proc)->pdr.frameoffset)
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@ -316,16 +320,13 @@ init_extra_frame_info(fci)
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/* r0 bit means kernel trap */
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int kernel_trap = PROC_REG_MASK(proc_desc) & 1;
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if (fci->frame == 0)
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{
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/* Fixup frame-pointer - only needed for top frame */
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/* This may not be quite right, if proc has a real frame register */
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if (fci->pc == PROC_LOW_ADDR(proc_desc))
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fci->frame = read_register (SP_REGNUM);
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else
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fci->frame = READ_FRAME_REG(fci, PROC_FRAME_REG(proc_desc))
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+ PROC_FRAME_OFFSET(proc_desc);
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}
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/* Fixup frame-pointer - only needed for top frame */
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/* This may not be quite right, if proc has a real frame register */
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if (fci->pc == PROC_LOW_ADDR(proc_desc))
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fci->frame = read_register (SP_REGNUM);
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else
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fci->frame = READ_FRAME_REG(fci, PROC_FRAME_REG(proc_desc))
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+ PROC_FRAME_OFFSET(proc_desc);
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if (proc_desc == &temp_proc_desc)
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*fci->saved_regs = temp_saved_regs;
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@ -381,11 +382,14 @@ init_extra_frame_info(fci)
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arguments without difficulty. */
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FRAME
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setup_arbitrary_frame (stack, pc)
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FRAME_ADDR stack;
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CORE_ADDR pc;
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setup_arbitrary_frame (argc, argv)
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int argc;
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FRAME_ADDR *argv;
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{
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return create_new_frame (stack, pc);
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if (argc != 2)
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error ("MIPS frame specifications require two arguments: sp and pc");
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return create_new_frame (argv[0], argv[1]);
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}
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@ -470,12 +474,12 @@ mips_push_dummy_frame()
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* Saved D18 (i.e. F19, F18)
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* ...
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* Saved D0 (i.e. F1, F0)
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* CALL_DUMMY (subroutine stub; see m-mips.h)
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* CALL_DUMMY (subroutine stub; see tm-mips.h)
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* Parameter build area (not yet implemented)
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* (low memory)
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*/
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PROC_REG_MASK(proc_desc) = GEN_REG_SAVE_MASK;
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PROC_FREG_MASK(proc_desc) = FLOAT_REG_SAVE_MASK;
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PROC_FREG_MASK(proc_desc) = mips_fpu ? FLOAT_REG_SAVE_MASK : 0;
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PROC_REG_OFFSET(proc_desc) = /* offset of (Saved R31) from FP */
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-sizeof(long) - 4 * SPECIAL_REG_SAVE_COUNT;
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PROC_FREG_OFFSET(proc_desc) = /* offset of (Saved D18) from FP */
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@ -507,9 +511,11 @@ mips_push_dummy_frame()
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write_memory (sp - 8, (char *)&buffer, sizeof(REGISTER_TYPE));
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buffer = read_register (LO_REGNUM);
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write_memory (sp - 12, (char *)&buffer, sizeof(REGISTER_TYPE));
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buffer = read_register (FCRCS_REGNUM);
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buffer = read_register (mips_fpu ? FCRCS_REGNUM : ZERO_REGNUM);
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write_memory (sp - 16, (char *)&buffer, sizeof(REGISTER_TYPE));
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sp -= 4 * (GEN_REG_SAVE_COUNT+FLOAT_REG_SAVE_COUNT+SPECIAL_REG_SAVE_COUNT);
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sp -= 4 * (GEN_REG_SAVE_COUNT
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+ (mips_fpu ? FLOAT_REG_SAVE_COUNT : 0)
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+ SPECIAL_REG_SAVE_COUNT);
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write_register (SP_REGNUM, sp);
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PROC_LOW_ADDR(proc_desc) = sp - CALL_DUMMY_SIZE + CALL_DUMMY_START_OFFSET;
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PROC_HIGH_ADDR(proc_desc) = sp;
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@ -568,7 +574,8 @@ mips_pop_frame()
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write_register (HI_REGNUM, read_memory_integer(new_sp - 8, 4));
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write_register (LO_REGNUM, read_memory_integer(new_sp - 12, 4));
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write_register (FCRCS_REGNUM, read_memory_integer(new_sp - 16, 4));
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if (mips_fpu)
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write_register (FCRCS_REGNUM, read_memory_integer(new_sp - 16, 4));
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}
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}
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@ -686,7 +693,11 @@ isa_NAN(p, len)
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}
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else if (len == 8)
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{
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#if TARGET_BYTE_ORDER == BIG_ENDIAN
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exponent = *p;
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#else
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exponent = *(p+1);
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#endif
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exponent = exponent << 1 >> (32 - DOUBLE_EXP_BITS - 1);
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return ((exponent == -1) || (! exponent && *p * *(p+1)));
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}
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@ -739,3 +750,17 @@ mips_skip_prologue(pc)
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return pc;
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}
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/* Let the user turn off floating point. */
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void
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_initialize_mips_tdep ()
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{
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add_show_from_set
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(add_set_cmd ("mips_fpu", class_support, var_boolean,
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(char *) &mips_fpu,
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"Set use of floating point coprocessor.\n\
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Turn off to avoid using floating point instructions when calling functions\n\
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or dealing with return values.", &setlist),
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&showlist);
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}
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