2016-01-01 05:33:14 +01:00
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/* Copyright (C) 2012-2016 Free Software Foundation, Inc.
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2012-12-18 15:52:59 +01:00
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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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "osabi.h"
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#include "regcache.h"
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#include "gdbcore.h"
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#include "gdbtypes.h"
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#include "infcall.h"
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#include "ppc-tdep.h"
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#include "value.h"
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#include "xcoffread.h"
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/* Implement the "push_dummy_call" gdbarch method. */
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static CORE_ADDR
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rs6000_lynx178_push_dummy_call (struct gdbarch *gdbarch,
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struct value *function,
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struct regcache *regcache, CORE_ADDR bp_addr,
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int nargs, struct value **args, CORE_ADDR sp,
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int struct_return, CORE_ADDR struct_addr)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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int ii;
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int len = 0;
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int argno; /* current argument number */
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int argbytes; /* current argument byte */
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gdb_byte tmp_buffer[50];
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int f_argno = 0; /* current floating point argno */
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int wordsize = gdbarch_tdep (gdbarch)->wordsize;
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CORE_ADDR func_addr = find_function_addr (function, NULL);
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struct value *arg = 0;
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struct type *type;
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ULONGEST saved_sp;
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/* The calling convention this function implements assumes the
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processor has floating-point registers. We shouldn't be using it
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on PPC variants that lack them. */
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gdb_assert (ppc_floating_point_unit_p (gdbarch));
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/* The first eight words of ther arguments are passed in registers.
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Copy them appropriately. */
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ii = 0;
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/* If the function is returning a `struct', then the first word
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(which will be passed in r3) is used for struct return address.
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In that case we should advance one word and start from r4
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register to copy parameters. */
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if (struct_return)
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{
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regcache_raw_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
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struct_addr);
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ii++;
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}
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/* Effectively indirect call... gcc does...
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return_val example( float, int);
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eabi:
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float in fp0, int in r3
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offset of stack on overflow 8/16
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for varargs, must go by type.
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power open:
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float in r3&r4, int in r5
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offset of stack on overflow different
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both:
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return in r3 or f0. If no float, must study how gcc emulates floats;
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pay attention to arg promotion.
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User may have to cast\args to handle promotion correctly
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since gdb won't know if prototype supplied or not. */
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for (argno = 0, argbytes = 0; argno < nargs && ii < 8; ++ii)
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{
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int reg_size = register_size (gdbarch, ii + 3);
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arg = args[argno];
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type = check_typedef (value_type (arg));
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len = TYPE_LENGTH (type);
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if (TYPE_CODE (type) == TYPE_CODE_FLT)
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{
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/* Floating point arguments are passed in fpr's, as well as gpr's.
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There are 13 fpr's reserved for passing parameters. At this point
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2013-05-13 12:27:35 +02:00
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there is no way we would run out of them.
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Always store the floating point value using the register's
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floating-point format. */
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const int fp_regnum = tdep->ppc_fp0_regnum + 1 + f_argno;
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gdb_byte reg_val[MAX_REGISTER_SIZE];
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struct type *reg_type = register_type (gdbarch, fp_regnum);
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2012-12-18 15:52:59 +01:00
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gdb_assert (len <= 8);
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2013-05-13 12:27:35 +02:00
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convert_typed_floating (value_contents (arg), type,
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reg_val, reg_type);
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regcache_cooked_write (regcache, fp_regnum, reg_val);
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2012-12-18 15:52:59 +01:00
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++f_argno;
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}
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if (len > reg_size)
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{
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/* Argument takes more than one register. */
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while (argbytes < len)
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{
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gdb_byte word[MAX_REGISTER_SIZE];
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memset (word, 0, reg_size);
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memcpy (word,
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((char *) value_contents (arg)) + argbytes,
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(len - argbytes) > reg_size
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? reg_size : len - argbytes);
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regcache_cooked_write (regcache,
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tdep->ppc_gp0_regnum + 3 + ii,
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word);
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++ii, argbytes += reg_size;
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if (ii >= 8)
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goto ran_out_of_registers_for_arguments;
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}
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argbytes = 0;
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--ii;
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}
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else
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{
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/* Argument can fit in one register. No problem. */
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gdb_byte word[MAX_REGISTER_SIZE];
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memset (word, 0, reg_size);
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memcpy (word, value_contents (arg), len);
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regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3 +ii, word);
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}
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++argno;
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}
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ran_out_of_registers_for_arguments:
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regcache_cooked_read_unsigned (regcache,
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gdbarch_sp_regnum (gdbarch),
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&saved_sp);
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/* Location for 8 parameters are always reserved. */
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sp -= wordsize * 8;
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/* Another six words for back chain, TOC register, link register, etc. */
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sp -= wordsize * 6;
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/* Stack pointer must be quadword aligned. */
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sp = align_down (sp, 16);
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/* If there are more arguments, allocate space for them in
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the stack, then push them starting from the ninth one. */
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if ((argno < nargs) || argbytes)
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{
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int space = 0, jj;
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if (argbytes)
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{
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space += align_up (len - argbytes, 4);
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jj = argno + 1;
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}
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else
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jj = argno;
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for (; jj < nargs; ++jj)
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{
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struct value *val = args[jj];
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space += align_up (TYPE_LENGTH (value_type (val)), 4);
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}
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/* Add location required for the rest of the parameters. */
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space = align_up (space, 16);
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sp -= space;
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/* This is another instance we need to be concerned about
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securing our stack space. If we write anything underneath %sp
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(r1), we might conflict with the kernel who thinks he is free
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to use this area. So, update %sp first before doing anything
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else. */
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regcache_raw_write_signed (regcache,
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gdbarch_sp_regnum (gdbarch), sp);
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/* If the last argument copied into the registers didn't fit there
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completely, push the rest of it into stack. */
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if (argbytes)
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{
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write_memory (sp + 24 + (ii * 4),
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value_contents (arg) + argbytes,
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len - argbytes);
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++argno;
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ii += align_up (len - argbytes, 4) / 4;
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}
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/* Push the rest of the arguments into stack. */
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for (; argno < nargs; ++argno)
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{
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arg = args[argno];
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type = check_typedef (value_type (arg));
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len = TYPE_LENGTH (type);
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/* Float types should be passed in fpr's, as well as in the
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stack. */
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if (TYPE_CODE (type) == TYPE_CODE_FLT && f_argno < 13)
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{
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gdb_assert (len <= 8);
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regcache_cooked_write (regcache,
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tdep->ppc_fp0_regnum + 1 + f_argno,
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value_contents (arg));
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++f_argno;
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}
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write_memory (sp + 24 + (ii * 4), value_contents (arg), len);
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ii += align_up (len, 4) / 4;
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}
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}
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/* Set the stack pointer. According to the ABI, the SP is meant to
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be set _before_ the corresponding stack space is used. On AIX,
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this even applies when the target has been completely stopped!
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Not doing this can lead to conflicts with the kernel which thinks
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that it still has control over this not-yet-allocated stack
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region. */
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regcache_raw_write_signed (regcache, gdbarch_sp_regnum (gdbarch), sp);
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/* Set back chain properly. */
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store_unsigned_integer (tmp_buffer, wordsize, byte_order, saved_sp);
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write_memory (sp, tmp_buffer, wordsize);
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/* Point the inferior function call's return address at the dummy's
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breakpoint. */
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regcache_raw_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr);
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target_store_registers (regcache, -1);
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return sp;
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}
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/* Implement the "return_value" gdbarch method. */
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static enum return_value_convention
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rs6000_lynx178_return_value (struct gdbarch *gdbarch, struct value *function,
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struct type *valtype, struct regcache *regcache,
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gdb_byte *readbuf, const gdb_byte *writebuf)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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/* The calling convention this function implements assumes the
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processor has floating-point registers. We shouldn't be using it
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on PowerPC variants that lack them. */
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gdb_assert (ppc_floating_point_unit_p (gdbarch));
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/* AltiVec extension: Functions that declare a vector data type as a
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return value place that return value in VR2. */
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if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY && TYPE_VECTOR (valtype)
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&& TYPE_LENGTH (valtype) == 16)
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{
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if (readbuf)
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regcache_cooked_read (regcache, tdep->ppc_vr0_regnum + 2, readbuf);
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if (writebuf)
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regcache_cooked_write (regcache, tdep->ppc_vr0_regnum + 2, writebuf);
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return RETURN_VALUE_REGISTER_CONVENTION;
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}
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/* If the called subprogram returns an aggregate, there exists an
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implicit first argument, whose value is the address of a caller-
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allocated buffer into which the callee is assumed to store its
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return value. All explicit parameters are appropriately
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relabeled. */
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if (TYPE_CODE (valtype) == TYPE_CODE_STRUCT
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|| TYPE_CODE (valtype) == TYPE_CODE_UNION
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|| TYPE_CODE (valtype) == TYPE_CODE_ARRAY)
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return RETURN_VALUE_STRUCT_CONVENTION;
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/* Scalar floating-point values are returned in FPR1 for float or
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double, and in FPR1:FPR2 for quadword precision. Fortran
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complex*8 and complex*16 are returned in FPR1:FPR2, and
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complex*32 is returned in FPR1:FPR4. */
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if (TYPE_CODE (valtype) == TYPE_CODE_FLT
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&& (TYPE_LENGTH (valtype) == 4 || TYPE_LENGTH (valtype) == 8))
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{
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struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum);
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gdb_byte regval[8];
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/* FIXME: kettenis/2007-01-01: Add support for quadword
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precision and complex. */
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if (readbuf)
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{
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regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, regval);
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convert_typed_floating (regval, regtype, readbuf, valtype);
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}
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if (writebuf)
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{
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convert_typed_floating (writebuf, valtype, regval, regtype);
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regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, regval);
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}
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return RETURN_VALUE_REGISTER_CONVENTION;
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}
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/* Values of the types int, long, short, pointer, and char (length
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is less than or equal to four bytes), as well as bit values of
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lengths less than or equal to 32 bits, must be returned right
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justified in GPR3 with signed values sign extended and unsigned
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values zero extended, as necessary. */
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if (TYPE_LENGTH (valtype) <= tdep->wordsize)
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{
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if (readbuf)
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{
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ULONGEST regval;
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/* For reading we don't have to worry about sign extension. */
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regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
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®val);
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store_unsigned_integer (readbuf, TYPE_LENGTH (valtype), byte_order,
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regval);
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}
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if (writebuf)
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{
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/* For writing, use unpack_long since that should handle any
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required sign extension. */
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regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
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unpack_long (valtype, writebuf));
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}
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return RETURN_VALUE_REGISTER_CONVENTION;
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}
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/* Eight-byte non-floating-point scalar values must be returned in
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GPR3:GPR4. */
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if (TYPE_LENGTH (valtype) == 8)
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{
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gdb_assert (TYPE_CODE (valtype) != TYPE_CODE_FLT);
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gdb_assert (tdep->wordsize == 4);
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if (readbuf)
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{
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gdb_byte regval[8];
|
|
|
|
|
|
|
|
regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, regval);
|
|
|
|
regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
|
|
|
|
regval + 4);
|
|
|
|
memcpy (readbuf, regval, 8);
|
|
|
|
}
|
|
|
|
if (writebuf)
|
|
|
|
{
|
|
|
|
regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, writebuf);
|
|
|
|
regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
|
|
|
|
writebuf + 4);
|
|
|
|
}
|
|
|
|
|
|
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
|
|
|
}
|
|
|
|
|
|
|
|
return RETURN_VALUE_STRUCT_CONVENTION;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* PowerPC Lynx178 OSABI sniffer. */
|
|
|
|
|
|
|
|
static enum gdb_osabi
|
|
|
|
rs6000_lynx178_osabi_sniffer (bfd *abfd)
|
|
|
|
{
|
|
|
|
if (bfd_get_flavour (abfd) != bfd_target_xcoff_flavour)
|
|
|
|
return GDB_OSABI_UNKNOWN;
|
|
|
|
|
|
|
|
/* The only noticeable difference between Lynx178 XCOFF files and
|
|
|
|
AIX XCOFF files comes from the fact that there are no shared
|
|
|
|
libraries on Lynx178. So if the number of import files is
|
|
|
|
different from zero, it cannot be a Lynx178 binary. */
|
|
|
|
if (xcoff_get_n_import_files (abfd) != 0)
|
|
|
|
return GDB_OSABI_UNKNOWN;
|
|
|
|
|
|
|
|
return GDB_OSABI_LYNXOS178;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Callback for powerpc-lynx178 initialization. */
|
|
|
|
|
|
|
|
static void
|
|
|
|
rs6000_lynx178_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
|
|
|
{
|
|
|
|
set_gdbarch_push_dummy_call (gdbarch, rs6000_lynx178_push_dummy_call);
|
|
|
|
set_gdbarch_return_value (gdbarch, rs6000_lynx178_return_value);
|
|
|
|
set_gdbarch_long_double_bit (gdbarch, 8 * TARGET_CHAR_BIT);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* -Wmissing-prototypes. */
|
|
|
|
extern initialize_file_ftype _initialize_rs6000_lynx178_tdep;
|
|
|
|
|
|
|
|
void
|
|
|
|
_initialize_rs6000_lynx178_tdep (void)
|
|
|
|
{
|
|
|
|
gdbarch_register_osabi_sniffer (bfd_arch_rs6000,
|
|
|
|
bfd_target_xcoff_flavour,
|
|
|
|
rs6000_lynx178_osabi_sniffer);
|
|
|
|
gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_LYNXOS178,
|
|
|
|
rs6000_lynx178_init_osabi);
|
|
|
|
}
|
|
|
|
|