134e61c4a7
* ChangeLog: Correct date on last entry. * arm-linux-tdep.c (arm_linux_push_arguments): New function. * config/arm/tm-linux: Redefined PUSH_ARGUMENTS for Linux. * config/arm/tm-embed: Fix build warning from redefinition of LOWEST_PC. * config/arm/tm-arm.h: Remove TARGET_BYTE_ORDER_SELECTABLE. * config/arm/tm-wince.h: Remove TARGET_BYTE_ORDER_SELECTABLE and TARGET_BYTE_ORDER. Add TARGET_BYTE_ORDER_SELECTABLE_P to override default in tm-arm.h. Use default target byte order from tm-arm.h.
227 lines
7.2 KiB
C
227 lines
7.2 KiB
C
/* GNU/Linux on ARM target support.
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Copyright 1999, 2000 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "target.h"
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#include "value.h"
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#include "gdbtypes.h"
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#include "floatformat.h"
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#ifdef GET_LONGJMP_TARGET
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/* Figure out where the longjmp will land. We expect that we have
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just entered longjmp and haven't yet altered r0, r1, so the
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arguments are still in the registers. (A1_REGNUM) points at the
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jmp_buf structure from which we extract the pc (JB_PC) that we will
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land at. The pc is copied into ADDR. This routine returns true on
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success. */
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#define LONGJMP_TARGET_SIZE sizeof(int)
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#define JB_ELEMENT_SIZE sizeof(int)
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#define JB_SL 18
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#define JB_FP 19
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#define JB_SP 20
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#define JB_PC 21
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int
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arm_get_longjmp_target (CORE_ADDR * pc)
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{
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CORE_ADDR jb_addr;
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char buf[LONGJMP_TARGET_SIZE];
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jb_addr = read_register (A1_REGNUM);
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if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
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LONGJMP_TARGET_SIZE))
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return 0;
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*pc = extract_address (buf, LONGJMP_TARGET_SIZE);
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return 1;
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}
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#endif /* GET_LONGJMP_TARGET */
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/* Extract from an array REGBUF containing the (raw) register state
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a function return value of type TYPE, and copy that, in virtual format,
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into VALBUF. */
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void
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arm_linux_extract_return_value (struct type *type,
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char regbuf[REGISTER_BYTES],
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char *valbuf)
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{
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/* ScottB: This needs to be looked at to handle the different
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floating point emulators on ARM Linux. Right now the code
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assumes that fetch inferior registers does the right thing for
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GDB. I suspect this won't handle NWFPE registers correctly, nor
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will the default ARM version (arm_extract_return_value()). */
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int regnum = (TYPE_CODE_FLT == TYPE_CODE (type)) ? F0_REGNUM : A1_REGNUM;
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memcpy (valbuf, ®buf[REGISTER_BYTE (regnum)], TYPE_LENGTH (type));
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}
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/* Note: ScottB
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This function does not support passing parameters using the FPA
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variant of the APCS. It passes any floating point arguments in the
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general registers and/or on the stack.
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FIXME: This and arm_push_arguments should be merged. However this
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function breaks on a little endian host, big endian target
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using the COFF file format. ELF is ok.
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ScottB. */
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/* Addresses for calling Thumb functions have the bit 0 set.
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Here are some macros to test, set, or clear bit 0 of addresses. */
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#define IS_THUMB_ADDR(addr) ((addr) & 1)
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#define MAKE_THUMB_ADDR(addr) ((addr) | 1)
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#define UNMAKE_THUMB_ADDR(addr) ((addr) & ~1)
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CORE_ADDR
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arm_linux_push_arguments (int nargs, value_ptr * args, CORE_ADDR sp,
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int struct_return, CORE_ADDR struct_addr)
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{
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char *fp;
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int argnum, argreg, nstack_size;
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/* Walk through the list of args and determine how large a temporary
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stack is required. Need to take care here as structs may be
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passed on the stack, and we have to to push them. */
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nstack_size = -4 * REGISTER_SIZE; /* Some arguments go into A1-A4. */
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if (struct_return) /* The struct address goes in A1. */
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nstack_size += REGISTER_SIZE;
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/* Walk through the arguments and add their size to nstack_size. */
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for (argnum = 0; argnum < nargs; argnum++)
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{
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int len;
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struct type *arg_type;
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arg_type = check_typedef (VALUE_TYPE (args[argnum]));
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len = TYPE_LENGTH (arg_type);
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/* ANSI C code passes float arguments as integers, K&R code
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passes float arguments as doubles. Correct for this here. */
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if (TYPE_CODE_FLT == TYPE_CODE (arg_type) && REGISTER_SIZE == len)
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nstack_size += FP_REGISTER_VIRTUAL_SIZE;
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else
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nstack_size += len;
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}
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/* Allocate room on the stack, and initialize our stack frame
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pointer. */
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fp = NULL;
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if (nstack_size > 0)
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{
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sp -= nstack_size;
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fp = (char *) sp;
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}
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/* Initialize the integer argument register pointer. */
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argreg = A1_REGNUM;
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/* The struct_return pointer occupies the first parameter passing
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register. */
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if (struct_return)
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write_register (argreg++, struct_addr);
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/* Process arguments from left to right. Store as many as allowed
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in the parameter passing registers (A1-A4), and save the rest on
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the temporary stack. */
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for (argnum = 0; argnum < nargs; argnum++)
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{
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int len;
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char *val;
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double dbl_arg;
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CORE_ADDR regval;
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enum type_code typecode;
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struct type *arg_type, *target_type;
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arg_type = check_typedef (VALUE_TYPE (args[argnum]));
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target_type = TYPE_TARGET_TYPE (arg_type);
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len = TYPE_LENGTH (arg_type);
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typecode = TYPE_CODE (arg_type);
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val = (char *) VALUE_CONTENTS (args[argnum]);
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/* ANSI C code passes float arguments as integers, K&R code
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passes float arguments as doubles. The .stabs record for
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for ANSI prototype floating point arguments records the
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type as FP_INTEGER, while a K&R style (no prototype)
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.stabs records the type as FP_FLOAT. In this latter case
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the compiler converts the float arguments to double before
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calling the function. */
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if (TYPE_CODE_FLT == typecode && REGISTER_SIZE == len)
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{
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/* Float argument in buffer is in host format. Read it and
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convert to DOUBLEST, and store it in target double. */
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DOUBLEST dblval;
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len = TARGET_DOUBLE_BIT / TARGET_CHAR_BIT;
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floatformat_to_doublest (HOST_FLOAT_FORMAT, val, &dblval);
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store_floating (&dbl_arg, len, dblval);
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val = (char *) &dbl_arg;
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}
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/* If the argument is a pointer to a function, and it is a Thumb
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function, set the low bit of the pointer. */
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if (TYPE_CODE_PTR == typecode
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&& NULL != target_type
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&& TYPE_CODE_FUNC == TYPE_CODE (target_type))
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{
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CORE_ADDR regval = extract_address (val, len);
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if (arm_pc_is_thumb (regval))
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store_address (val, len, MAKE_THUMB_ADDR (regval));
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}
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/* Copy the argument to general registers or the stack in
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register-sized pieces. Large arguments are split between
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registers and stack. */
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while (len > 0)
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{
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int partial_len = len < REGISTER_SIZE ? len : REGISTER_SIZE;
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if (argreg <= ARM_LAST_ARG_REGNUM)
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{
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/* It's an argument being passed in a general register. */
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regval = extract_address (val, partial_len);
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write_register (argreg++, regval);
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}
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else
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{
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/* Push the arguments onto the stack. */
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write_memory ((CORE_ADDR) fp, val, REGISTER_SIZE);
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fp += REGISTER_SIZE;
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}
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len -= partial_len;
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val += partial_len;
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}
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}
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/* Return adjusted stack pointer. */
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return sp;
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}
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void
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_initialize_arm_linux_tdep (void)
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{
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}
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