2000-04-07 Scott Bambrough <scottb@netwinder.org>
* 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.
This commit is contained in:
Scott Bambrough
parent
03e0fb3a47
commit
134e61c4a7
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@ -1,4 +1,17 @@
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2000-04-05 Scott Bambrough <scottb@netwinder.org>
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2000-04-07 Scott Bambrough <scottb@netwinder.org>
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* ChangeLog: Correct date on last entry.
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* arm-linux-tdep.c (arm_linux_push_arguments): New function.
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* config/arm/tm-linux: Redefined PUSH_ARGUMENTS for Linux.
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* config/arm/tm-embed: Fix build warning from redefinition of
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LOWEST_PC.
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* config/arm/tm-arm.h: Remove TARGET_BYTE_ORDER_SELECTABLE.
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* config/arm/tm-wince.h: Remove TARGET_BYTE_ORDER_SELECTABLE and
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TARGET_BYTE_ORDER. Add TARGET_BYTE_ORDER_SELECTABLE_P to
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override default in tm-arm.h. Use default target byte order
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from tm-arm.h.
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2000-04-07 Scott Bambrough <scottb@netwinder.org>
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* Makefile.in: Add dependency information for arm-linux-tdep.c.
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* config/djgpp/fnchange.lst: Add arm-linux-tdep.c, arm-linux-nat.c.
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@ -22,6 +22,7 @@
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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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@ -76,6 +77,150 @@ arm_linux_extract_return_value (struct type *type,
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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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@ -25,11 +25,9 @@
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struct type;
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struct value;
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#define TARGET_BYTE_ORDER_SELECTABLE
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/* Target byte order on ARM defaults to selectable, and defaults to
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little endian. */
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#define TARGET_BYTE_ORDER_SELECTABLE_P 1
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#define TARGET_BYTE_ORDER_SELECTABLE_P 1
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#define TARGET_BYTE_ORDER_DEFAULT LITTLE_ENDIAN
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/* IEEE format floating point. */
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@ -32,6 +32,7 @@
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#define STACK_END_ADDR (0x01000000 - (TARGET_UPAGES * TARGET_NBPG))
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/* The first 0x20 bytes are the trap vectors. */
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#undef LOWEST_PC
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#define LOWEST_PC 0x20
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/* Override defaults. */
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@ -26,9 +26,9 @@
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#include "tm-linux.h"
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/* Target byte order on ARM Linux is not selectable. */
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/* Target byte order on ARM Linux is little endian and not selectable. */
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#undef TARGET_BYTE_ORDER_SELECTABLE_P
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#define TARGET_BYTE_ORDER_SELECTABLE_P 0
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#define TARGET_BYTE_ORDER_SELECTABLE_P 0
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/* Under ARM Linux the traditional way of performing a breakpoint is to
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execute a particular software interrupt, rather than use a particular
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@ -60,6 +60,21 @@ extern void arm_linux_extract_return_value (struct type *, char[], char *);
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#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
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arm_linux_extract_return_value ((TYPE), (REGBUF), (VALBUF))
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/* Things needed for making the inferior call functions.
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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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#undef PUSH_ARGUMENTS
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#define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
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sp = arm_linux_push_arguments ((nargs), (args), (sp), (struct_return), \
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(struct_addr))
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extern CORE_ADDR arm_linux_push_arguments (int, struct value **, CORE_ADDR,
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int, CORE_ADDR);
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/* The first page is not writeable in ARM Linux. */
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#undef LOWEST_PC
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#define LOWEST_PC 0x8000
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@ -31,7 +31,8 @@
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void wince_software_single_step (unsigned int, int);
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#undef TARGET_BYTE_ORDER_SELECTABLE
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#define TARGET_BYTE_ORDER LITTLE_ENDIAN
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/* Target byte order is little endian and not selectable on WinCE. */
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#undef TARGET_BYTE_ORDER_SELECTABLE_P
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#define TARGET_BYTE_ORDER_SELECTABLE_P 0
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#endif /* TM_WINCE_H */
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