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| author | Alan Modra <amodra@gmail.com> | 2000-02-23 13:52:23 +0000 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2000-02-23 13:52:23 +0000 |
| commit | 5b93d8bb517c1f5715435dcf627a8642f557ddb2 (patch) | |
| tree | e09626193185adb6455a6251622f32180183db5c /gas/config/tc-i370.c | |
| parent | ab91fdd5f80265ca7aabee53c9626d393ea8eb86 (diff) | |
| download | gdb-5b93d8bb517c1f5715435dcf627a8642f557ddb2.zip gdb-5b93d8bb517c1f5715435dcf627a8642f557ddb2.tar.gz gdb-5b93d8bb517c1f5715435dcf627a8642f557ddb2.tar.bz2 | |
Add IBM 370 support.
Diffstat (limited to 'gas/config/tc-i370.c')
| -rw-r--r-- | gas/config/tc-i370.c | 2967 |
1 files changed, 2967 insertions, 0 deletions
diff --git a/gas/config/tc-i370.c b/gas/config/tc-i370.c new file mode 100644 index 0000000..2183273 --- /dev/null +++ b/gas/config/tc-i370.c @@ -0,0 +1,2967 @@ +/* tc-i370.c -- Assembler for the IBM 360/370/390 instruction set. + Loosely based on the ppc files by Linas Vepstas <linas@linas.org> 1998, 99 + Copyright (C) 1994, 95, 96, 97, 98, 99, 2000 Free Software Foundation, Inc. + Written by Ian Lance Taylor, Cygnus Support. + + This file is part of GAS, the GNU Assembler. + + GAS 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 2, or (at your option) + any later version. + + GAS 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 GAS; see the file COPYING. If not, write to the Free + Software Foundation, 59 Temple Place - Suite 330, Boston, MA + 02111-1307, USA. */ + +/* This assembler implements a very hacked version of an elf-like thing + * that gcc emits (when gcc is suitably hacked). To make it behave more + * HLASM-like, try turning on the -M or --mri flag (as there are various + * similarities between HLASM and the MRI assemblers, such as section + * names, lack of leading . in pseudo-ops, DC and DS, etc ... + */ + +#include <stdio.h> +#include <ctype.h> +#include "as.h" +#include "subsegs.h" +#include "struc-symbol.h" + +#include "opcode/i370.h" + +#ifdef OBJ_ELF +#include "elf/i370.h" +#endif + +/* This is the assembler for the System/390 Architecture */ + +/* Tell the main code what the endianness is. */ +extern int target_big_endian; + + +/* Generic assembler global variables which must be defined by all + targets. */ + +#ifdef OBJ_ELF +/* This string holds the chars that always start a comment. If the + pre-processor is disabled, these aren't very useful. The macro + tc_comment_chars points to this. We use this, rather than the + usual comment_chars, so that we can switch for Solaris conventions. */ +static const char i370_eabi_comment_chars[] = "#"; + +const char *i370_comment_chars = i370_eabi_comment_chars; +#else +const char comment_chars[] = "#"; +#endif + +/* Characters which start a comment at the beginning of a line. */ +const char line_comment_chars[] = "#*"; + +/* Characters which may be used to separate multiple commands on a + single line. */ +const char line_separator_chars[] = ";"; + +/* Characters which are used to indicate an exponent in a floating + point number. */ +const char EXP_CHARS[] = "eE"; + +/* Characters which mean that a number is a floating point constant, + as in 0d1.0. */ +const char FLT_CHARS[] = "dD"; + + +void +md_show_usage (stream) + FILE *stream; +{ + fprintf(stream, "\ +S/370 options: (these have not yet been tested and may not work) \n\ +-u ignored\n\ +-mregnames Allow symbolic names for registers\n\ +-mno-regnames Do not allow symbolic names for registers\n"); +#ifdef OBJ_ELF + fprintf(stream, "\ +-mrelocatable support for GCC's -mrelocatble option\n\ +-mrelocatable-lib support for GCC's -mrelocatble-lib option\n\ +-V print assembler version number\n"); +#endif +} + + +static void i370_byte PARAMS ((int)); +static void i370_tc PARAMS ((int)); +static void i370_ebcdic PARAMS ((int)); + +static void i370_dc PARAMS ((int)); +static void i370_ds PARAMS ((int)); +static void i370_rmode PARAMS ((int)); +static void i370_csect PARAMS ((int)); +static void i370_dsect PARAMS ((int)); +static void i370_ltorg PARAMS ((int)); +static void i370_using PARAMS ((int)); +static void i370_drop PARAMS ((int)); +static void i370_make_relative PARAMS ((expressionS *exp, expressionS *baseaddr)); + +#ifdef OBJ_ELF +static bfd_reloc_code_real_type i370_elf_suffix PARAMS ((char **, expressionS *)); +static void i370_elf_cons PARAMS ((int)); +static void i370_elf_rdata PARAMS ((int)); +static void i370_elf_lcomm PARAMS ((int)); +static void i370_elf_validate_fix PARAMS ((fixS *, segT)); +#endif + + + +/* The target specific pseudo-ops which we support. */ + +const pseudo_typeS md_pseudo_table[] = +{ + /* Pseudo-ops which must be overridden. */ + { "byte", i370_byte, 0 }, + + { "dc", i370_dc, 0 }, + { "ds", i370_ds, 0 }, + { "rmode", i370_rmode, 0 }, + { "csect", i370_csect, 0 }, + { "dsect", i370_dsect, 0 }, + + /* enable ebcdic strings e.g. for 3270 support */ + { "ebcdic", i370_ebcdic, 0 }, + +#ifdef OBJ_ELF + { "long", i370_elf_cons, 4 }, + { "word", i370_elf_cons, 4 }, + { "short", i370_elf_cons, 2 }, + { "rdata", i370_elf_rdata, 0 }, + { "rodata", i370_elf_rdata, 0 }, + { "lcomm", i370_elf_lcomm, 0 }, +#endif + + /* This pseudo-op is used even when not generating XCOFF output. */ + { "tc", i370_tc, 0 }, + + /* dump the literal pool */ + { "ltorg", i370_ltorg, 0 }, + + /* support the hlasm-style USING directive */ + { "using", i370_using, 0 }, + { "drop", i370_drop, 0 }, + + { NULL, NULL, 0 } +}; + +/* ***************************************************************** */ + +/* Whether to use user friendly register names. */ +#define TARGET_REG_NAMES_P true + +static boolean reg_names_p = TARGET_REG_NAMES_P; + +static boolean register_name PARAMS ((expressionS *)); +static void i370_set_cpu PARAMS ((void)); +static i370_insn_t i370_insert_operand + PARAMS ((i370_insn_t insn, const struct i370_operand *operand, offsetT val)); +static void i370_macro PARAMS ((char *str, const struct i370_macro *macro)); + +/* Predefined register names if -mregnames */ +/* In general, there are lots of them, in an attempt to be compatible */ +/* with a number of assemblers. */ + +/* Structure to hold information about predefined registers. */ +struct pd_reg + { + char *name; + int value; + }; + +/* List of registers that are pre-defined: + + Each general register has predefined names of the form: + 1. r<reg_num> which has the value <reg_num>. + 2. r.<reg_num> which has the value <reg_num>. + + + Each floating point register has predefined names of the form: + 1. f<reg_num> which has the value <reg_num>. + 2. f.<reg_num> which has the value <reg_num>. + + There are only four floating point registers, and these are + commonly labelled 0,2,4 and 6. Thus, there is no f1, f3, etc. + + + There are individual registers as well: + rbase or r.base has the value 3 (base register) + rpgt or r.pgt has the value 4 (page origin table pointer) + rarg or r.arg has the value 11 (argument pointer) + rtca or r.tca has the value 12 (table of contents pointer) + rtoc or r.toc has the value 12 (table of contents pointer) + sp or r.sp has the value 13 (stack pointer) + dsa or r.dsa has the value 13 (stack pointer) + lr has the value 14 (link reg) + + The table is sorted. Suitable for searching by a binary search. */ + +static const struct pd_reg pre_defined_registers[] = +{ + { "arg", 11 }, /* Argument Pointer */ + { "base", 3 }, /* Base Reg */ + + { "f.0", 0 }, /* Floating point registers */ + { "f.2", 2 }, + { "f.4", 4 }, + { "f.6", 6 }, + + { "f0", 0 }, + { "f2", 2 }, + { "f4", 4 }, + { "f6", 6 }, + + + { "dsa",13 }, /* stack pointer */ + { "lr", 14 }, /* Link Register */ + { "pgt", 4 }, /* Page Origin Table Pointer */ + + { "r.0", 0 }, /* General Purpose Registers */ + { "r.1", 1 }, + { "r.10", 10 }, + { "r.11", 11 }, + { "r.12", 12 }, + { "r.13", 13 }, + { "r.14", 14 }, + { "r.15", 15 }, + { "r.2", 2 }, + { "r.3", 3 }, + { "r.4", 4 }, + { "r.5", 5 }, + { "r.6", 6 }, + { "r.7", 7 }, + { "r.8", 8 }, + { "r.9", 9 }, + + { "r.arg", 11 }, /* Argument Pointer */ + { "r.base", 3 }, /* Base Reg */ + { "r.dsa", 13 }, /* Stack Pointer */ + { "r.pgt", 4 }, /* Page Origin Table Pointer */ + { "r.sp", 13 }, /* Stack Pointer */ + + { "r.tca", 12 }, /* Pointer to the table of contents */ + { "r.toc", 12 }, /* Pointer to the table of contents */ + + { "r0", 0 }, /* More general purpose registers */ + { "r1", 1 }, + { "r10", 10 }, + { "r11", 11 }, + { "r12", 12 }, + { "r13", 13 }, + { "r14", 14 }, + { "r15", 15 }, + { "r2", 2 }, + { "r3", 3 }, + { "r4", 4 }, + { "r5", 5 }, + { "r6", 6 }, + { "r7", 7 }, + { "r8", 8 }, + { "r9", 9 }, + + { "rbase", 3 }, /* Base Reg */ + + { "rtca", 12 }, /* Pointer to the table of contents */ + { "rtoc", 12 }, /* Pointer to the table of contents */ + + { "sp", 13 }, /* Stack Pointer */ + +}; + +#define REG_NAME_CNT (sizeof(pre_defined_registers) / sizeof(struct pd_reg)) + +/* Given NAME, find the register number associated with that name, return + the integer value associated with the given name or -1 on failure. */ + +static int reg_name_search + PARAMS ((const struct pd_reg *, int, const char * name)); + +static int +reg_name_search (regs, regcount, name) + const struct pd_reg *regs; + int regcount; + const char *name; +{ + int middle, low, high; + int cmp; + + low = 0; + high = regcount - 1; + + do + { + middle = (low + high) / 2; + cmp = strcasecmp (name, regs[middle].name); + if (cmp < 0) + high = middle - 1; + else if (cmp > 0) + low = middle + 1; + else + return regs[middle].value; + } + while (low <= high); + + return -1; +} + +/* + * Summary of register_name(). + * + * in: Input_line_pointer points to 1st char of operand. + * + * out: A expressionS. + * The operand may have been a register: in this case, X_op == O_register, + * X_add_number is set to the register number, and truth is returned. + * Input_line_pointer->(next non-blank) char after operand, or is in its + * original state. + */ + +static boolean +register_name (expressionP) + expressionS *expressionP; +{ + int reg_number; + char *name; + char *start; + char c; + + /* Find the spelling of the operand */ + start = name = input_line_pointer; + if (name[0] == '%' && isalpha (name[1])) + name = ++input_line_pointer; + + else if (!reg_names_p) + return false; + + while (' ' == *name) + name = ++input_line_pointer; + + /* if its a number, treat it as a number */ + /* if its alpha, look to see if it's in the register table */ + if (!isalpha (name[0])) + { + reg_number = get_single_number(); + c = get_symbol_end (); + } + else + { + c = get_symbol_end (); + reg_number = reg_name_search (pre_defined_registers, REG_NAME_CNT, name); + } + + /* if numeric, make sure its not out of bounds */ + if ((0 <= reg_number) && (16 >= reg_number)) + { + expressionP->X_op = O_register; + expressionP->X_add_number = reg_number; + + /* make the rest nice */ + expressionP->X_add_symbol = NULL; + expressionP->X_op_symbol = NULL; + *input_line_pointer = c; /* put back the delimiting char */ + return true; + } + + /* reset the line as if we had not done anything */ + *input_line_pointer = c; /* put back the delimiting char */ + input_line_pointer = start; /* reset input_line pointer */ + return false; +} + +/* Local variables. */ + +/* The type of processor we are assembling for. This is one or more + of the I370_OPCODE flags defined in opcode/i370.h. */ +static int i370_cpu = 0; + +/* The base register to use for opcode with optional operands. + * We define two of these: "text" and "other". Normally, "text" + * would get used in the .text section for branches, while "other" + * gets used in the .data section for address constants. + * + * The idea of a second base register in a different section + * is foreign to the usual HLASM-style semantics; however, it + * allows us to provide support for dynamically loaded libraries, + * by allowing us to place address constants in a section other + * than the text section. The "other" section need not be the + * .data section, it can be any section that isn't the .text section. + * + * Note that HLASM defines a multiple, concurrent .using semantic + * that we do not: in calculating offsets, it uses either the most + * recent .using directive, or the one with the smallest displacement. + * This allows HLASM to support a quasi-block-scope-like behaviour. + * Handy for people writing assembly by hand ... but not supported + * by us. + */ +static int i370_using_text_regno = -1; +static int i370_using_other_regno = -1; + +/* The base address for address literals */ +static expressionS i370_using_text_baseaddr; +static expressionS i370_using_other_baseaddr; + +/* the "other" section, used only for syntax error detection */ +static segT i370_other_section = undefined_section; + +/* Opcode hash table. */ +static struct hash_control *i370_hash; + +/* Macro hash table. */ +static struct hash_control *i370_macro_hash; + +#ifdef OBJ_ELF +/* What type of shared library support to use */ +static enum { SHLIB_NONE, SHLIB_PIC, SHILB_MRELOCATABLE } shlib = SHLIB_NONE; +#endif + +/* Flags to set in the elf header */ +static flagword i370_flags = 0; + +#ifndef WORKING_DOT_WORD +const int md_short_jump_size = 4; +const int md_long_jump_size = 4; +#endif + +#ifdef OBJ_ELF +CONST char *md_shortopts = "l:um:K:VQ:"; +#else +CONST char *md_shortopts = "um:"; +#endif +struct option md_longopts[] = +{ + {NULL, no_argument, NULL, 0} +}; +size_t md_longopts_size = sizeof(md_longopts); + +int +md_parse_option (c, arg) + int c; + char *arg; +{ + switch (c) + { + case 'u': + /* -u means that any undefined symbols should be treated as + external, which is the default for gas anyhow. */ + break; + +#ifdef OBJ_ELF + case 'K': + /* Recognize -K PIC */ + if (strcmp (arg, "PIC") == 0 || strcmp (arg, "pic") == 0) + { + shlib = SHLIB_PIC; + i370_flags |= EF_I370_RELOCATABLE_LIB; + } + else + return 0; + + break; +#endif + + case 'm': + + /* -m360 mean to assemble for the ancient 360 architecture */ + if (strcmp (arg, "360") == 0 || strcmp (arg, "i360") == 0) + i370_cpu = I370_OPCODE_360; + /* -mxa means to assemble for the IBM 370 XA */ + else if (strcmp (arg, "xa") == 0) + i370_cpu = I370_OPCODE_370_XA; + /* -many means to assemble for any architecture (370/XA). */ + else if (strcmp (arg, "any") == 0) + i370_cpu = I370_OPCODE_370; + + else if (strcmp (arg, "regnames") == 0) + reg_names_p = true; + + else if (strcmp (arg, "no-regnames") == 0) + reg_names_p = false; + +#ifdef OBJ_ELF + /* -mrelocatable/-mrelocatable-lib -- warn about initializations that require relocation */ + else if (strcmp (arg, "relocatable") == 0) + { + shlib = SHILB_MRELOCATABLE; + i370_flags |= EF_I370_RELOCATABLE; + } + + else if (strcmp (arg, "relocatable-lib") == 0) + { + shlib = SHILB_MRELOCATABLE; + i370_flags |= EF_I370_RELOCATABLE_LIB; + } + +#endif + else + { + as_bad ("invalid switch -m%s", arg); + return 0; + } + break; + +#ifdef OBJ_ELF + /* -V: SVR4 argument to print version ID. */ + case 'V': + print_version_id (); + break; + + /* -Qy, -Qn: SVR4 arguments controlling whether a .comment section + should be emitted or not. FIXME: Not implemented. */ + case 'Q': + break; + +#endif + + default: + return 0; + } + + return 1; +} + + +/* Set i370_cpu if it is not already set. + Currently defaults to the reasonable superset; + but can be made more fine grained if desred. */ + +static void +i370_set_cpu () +{ + const char *default_os = TARGET_OS; + const char *default_cpu = TARGET_CPU; + + /* override with the superset for the moment. */ + i370_cpu = I370_OPCODE_ESA390_SUPERSET; + if (i370_cpu == 0) + { + if (strcmp (default_cpu, "i360") == 0) + i370_cpu = I370_OPCODE_360; + else if (strcmp (default_cpu, "i370") == 0) + i370_cpu = I370_OPCODE_370; + else if (strcmp (default_cpu, "XA") == 0) + i370_cpu = I370_OPCODE_370_XA; + else + as_fatal ("Unknown default cpu = %s, os = %s", default_cpu, default_os); + } +} + +/* Figure out the BFD architecture to use. */ +// hack alert -- specify the different 370 architectures + +enum bfd_architecture +i370_arch () +{ + return bfd_arch_i370; +} + +/* This function is called when the assembler starts up. It is called + after the options have been parsed and the output file has been + opened. */ + +void +md_begin () +{ + register const struct i370_opcode *op; + const struct i370_opcode *op_end; + const struct i370_macro *macro; + const struct i370_macro *macro_end; + boolean dup_insn = false; + + i370_set_cpu (); + +#ifdef OBJ_ELF + /* Set the ELF flags if desired. */ + if (i370_flags) + bfd_set_private_flags (stdoutput, i370_flags); +#endif + + /* Insert the opcodes into a hash table. */ + i370_hash = hash_new (); + + op_end = i370_opcodes + i370_num_opcodes; + for (op = i370_opcodes; op < op_end; op++) + { + know ((op->opcode & op->mask) == op->opcode); + + if ((op->flags & i370_cpu) != 0) + { + const char *retval; + + retval = hash_insert (i370_hash, op->name, (PTR) op); + if (retval != (const char *) NULL) + { + as_bad ("Internal assembler error for instruction %s", op->name); + dup_insn = true; + } + } + } + + /* Insert the macros into a hash table. */ + i370_macro_hash = hash_new (); + + macro_end = i370_macros + i370_num_macros; + for (macro = i370_macros; macro < macro_end; macro++) + { + if ((macro->flags & i370_cpu) != 0) + { + const char *retval; + + retval = hash_insert (i370_macro_hash, macro->name, (PTR) macro); + if (retval != (const char *) NULL) + { + as_bad ("Internal assembler error for macro %s", macro->name); + dup_insn = true; + } + } + } + + if (dup_insn) + abort (); +} + +/* Insert an operand value into an instruction. */ + +static i370_insn_t +i370_insert_operand (insn, operand, val) + i370_insn_t insn; + const struct i370_operand *operand; + offsetT val; +{ + if (operand->insert) + { + const char *errmsg; + + /* used for 48-bit insn's */ + errmsg = NULL; + insn = (*operand->insert) (insn, (long) val, &errmsg); + if (errmsg) + as_bad ("%s", errmsg); + } + else + { + /* this is used only for 16, 32 bit insn's */ + insn.i[0] |= (((long) val & ((1 << operand->bits) - 1)) + << operand->shift); + } + + return insn; +} + + +#ifdef OBJ_ELF +/* Parse @got, etc. and return the desired relocation. + * Currently, i370 does not support (don't really need to support) any + * of these fancier markups ... for example, no one is going to + * write 'L 6,=V(bogus)@got' it just doesn't make sense (at least to me). + * So basically, we could get away with this routine returning + * BFD_RELOC_UNUSED in all circumstances. However, I'll leave + * in for now in case someone ambitious finds a good use for this stuff ... + * this routine was pretty much just copied from the powerpc code ... + */ +static bfd_reloc_code_real_type +i370_elf_suffix (str_p, exp_p) + char **str_p; + expressionS *exp_p; +{ + struct map_bfd + { + char *string; + int length; + bfd_reloc_code_real_type reloc; + }; + + char ident[20]; + char *str = *str_p; + char *str2; + int ch; + int len; + struct map_bfd *ptr; + +#define MAP(str,reloc) { str, sizeof(str)-1, reloc } + + static struct map_bfd mapping[] = + { + // MAP ("l", BFD_RELOC_LO16), + // MAP ("h", BFD_RELOC_HI16), + // MAP ("ha", BFD_RELOC_HI16_S), + MAP ("fixup", BFD_RELOC_CTOR), /* warnings with -mrelocatable */ + { (char *)0, 0, BFD_RELOC_UNUSED } + }; + + if (*str++ != '@') + return BFD_RELOC_UNUSED; + + for (ch = *str, str2 = ident; + (str2 < ident + sizeof (ident) - 1 + && (isalnum (ch) || ch == '@')); + ch = *++str) + { + *str2++ = (islower (ch)) ? ch : tolower (ch); + } + + *str2 = '\0'; + len = str2 - ident; + + ch = ident[0]; + for (ptr = &mapping[0]; ptr->length > 0; ptr++) + if (ch == ptr->string[0] + && len == ptr->length + && memcmp (ident, ptr->string, ptr->length) == 0) + { + if (exp_p->X_add_number != 0 + && (ptr->reloc == BFD_RELOC_16_GOTOFF + || ptr->reloc == BFD_RELOC_LO16_GOTOFF + || ptr->reloc == BFD_RELOC_HI16_GOTOFF + || ptr->reloc == BFD_RELOC_HI16_S_GOTOFF)) + as_warn ("identifier+constant@got means identifier@got+constant"); + + /* Now check for identifier@suffix+constant */ + if (*str == '-' || *str == '+') + { + char *orig_line = input_line_pointer; + expressionS new_exp; + + input_line_pointer = str; + expression (&new_exp); + if (new_exp.X_op == O_constant) + { + exp_p->X_add_number += new_exp.X_add_number; + str = input_line_pointer; + } + + if (&input_line_pointer != str_p) + input_line_pointer = orig_line; + } + + *str_p = str; + return ptr->reloc; + } + + return BFD_RELOC_UNUSED; +} + +/* Like normal .long/.short/.word, except support @got, etc. */ +/* clobbers input_line_pointer, checks end-of-line. */ +static void +i370_elf_cons (nbytes) + register int nbytes; /* 1=.byte, 2=.word, 4=.long */ +{ + expressionS exp; + bfd_reloc_code_real_type reloc; + + if (is_it_end_of_statement ()) + { + demand_empty_rest_of_line (); + return; + } + + do + { + expression (&exp); + if (exp.X_op == O_symbol + && *input_line_pointer == '@' + && (reloc = i370_elf_suffix (&input_line_pointer, &exp)) != BFD_RELOC_UNUSED) + { + reloc_howto_type *reloc_howto = bfd_reloc_type_lookup (stdoutput, reloc); + int size = bfd_get_reloc_size (reloc_howto); + + if (size > nbytes) + as_bad ("%s relocations do not fit in %d bytes\n", reloc_howto->name, nbytes); + + else + { + register char *p = frag_more ((int) nbytes); + int offset = nbytes - size; + + fix_new_exp (frag_now, p - frag_now->fr_literal + offset, size, &exp, 0, reloc); + } + } + else + emit_expr (&exp, (unsigned int) nbytes); + } + while (*input_line_pointer++ == ','); + + input_line_pointer--; /* Put terminator back into stream. */ + demand_empty_rest_of_line (); +} + + +/* ASCII to EBCDIC conversion table. */ +static unsigned char ascebc[256] = +{ + /*00 NL SH SX EX ET NQ AK BL */ + 0x00, 0x01, 0x02, 0x03, 0x37, 0x2D, 0x2E, 0x2F, + /*08 BS HT LF VT FF CR SO SI */ + 0x16, 0x05, 0x15, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, + /*10 DL D1 D2 D3 D4 NK SN EB */ + 0x10, 0x11, 0x12, 0x13, 0x3C, 0x3D, 0x32, 0x26, + /*18 CN EM SB EC FS GS RS US */ + 0x18, 0x19, 0x3F, 0x27, 0x1C, 0x1D, 0x1E, 0x1F, + /*20 SP ! " # $ % & ' */ + 0x40, 0x5A, 0x7F, 0x7B, 0x5B, 0x6C, 0x50, 0x7D, + /*28 ( ) * + , - . / */ + 0x4D, 0x5D, 0x5C, 0x4E, 0x6B, 0x60, 0x4B, 0x61, + /*30 0 1 2 3 4 5 6 7 */ + 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, + /*38 8 9 : ; < = > ? */ + 0xF8, 0xF9, 0x7A, 0x5E, 0x4C, 0x7E, 0x6E, 0x6F, + /*40 @ A B C D E F G */ + 0x7C, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, + /*48 H I J K L M N O */ + 0xC8, 0xC9, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, + /*50 P Q R S T U V W */ + 0xD7, 0xD8, 0xD9, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, + /*58 X Y Z [ \ ] ^ _ */ + 0xE7, 0xE8, 0xE9, 0xAD, 0xE0, 0xBD, 0x5F, 0x6D, + /*60 ` a b c d e f g */ + 0x79, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, + /*68 h i j k l m n o */ + 0x88, 0x89, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, + /*70 p q r s t u v w */ + 0x97, 0x98, 0x99, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, + /*78 x y z { | } ~ DL */ + 0xA7, 0xA8, 0xA9, 0xC0, 0x4F, 0xD0, 0xA1, 0x07, + 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, + 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, + 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, + 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, + 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, + 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, + 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, + 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, + 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, + 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, + 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, + 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, + 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, + 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, + 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, + 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0xFF +}; + +/* EBCDIC to ASCII conversion table. */ +unsigned char ebcasc[256] = +{ + /*00 NU SH SX EX PF HT LC DL */ + 0x00, 0x01, 0x02, 0x03, 0x00, 0x09, 0x00, 0x7F, + /*08 SM VT FF CR SO SI */ + 0x00, 0x00, 0x00, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, + /*10 DE D1 D2 TM RS NL BS IL */ + 0x10, 0x11, 0x12, 0x13, 0x14, 0x0A, 0x08, 0x00, + /*18 CN EM CC C1 FS GS RS US */ + 0x18, 0x19, 0x00, 0x00, 0x1C, 0x1D, 0x1E, 0x1F, + /*20 DS SS FS BP LF EB EC */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x0A, 0x17, 0x1B, + /*28 SM C2 EQ AK BL */ + 0x00, 0x00, 0x00, 0x00, 0x05, 0x06, 0x07, 0x00, + /*30 SY PN RS UC ET */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, + /*38 C3 D4 NK SU */ + 0x00, 0x00, 0x00, 0x00, 0x14, 0x15, 0x00, 0x1A, + /*40 SP */ + 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + /*48 . < ( + | */ + 0x00, 0x00, 0x00, 0x2E, 0x3C, 0x28, 0x2B, 0x7C, + /*50 & */ + 0x26, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + /*58 ! $ * ) ; ^ */ + 0x00, 0x00, 0x21, 0x24, 0x2A, 0x29, 0x3B, 0x5E, + /*60 - / */ + 0x2D, 0x2F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + /*68 , % _ > ? */ + 0x00, 0x00, 0x00, 0x2C, 0x25, 0x5F, 0x3E, 0x3F, + /*70 */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + /*78 ` : # @ ' = " */ + 0x00, 0x60, 0x3A, 0x23, 0x40, 0x27, 0x3D, 0x22, + /*80 a b c d e f g */ + 0x00, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, + /*88 h i { */ + 0x68, 0x69, 0x00, 0x7B, 0x00, 0x00, 0x00, 0x00, + /*90 j k l m n o p */ + 0x00, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, + /*98 q r } */ + 0x71, 0x72, 0x00, 0x7D, 0x00, 0x00, 0x00, 0x00, + /*A0 ~ s t u v w x */ + 0x00, 0x7E, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, + /*A8 y z [ */ + 0x79, 0x7A, 0x00, 0x00, 0x00, 0x5B, 0x00, 0x00, + /*B0 */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + /*B8 ] */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x5D, 0x00, 0x00, + /*C0 { A B C D E F G */ + 0x7B, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, + /*C8 H I */ + 0x48, 0x49, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + /*D0 } J K L M N O P */ + 0x7D, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, + /*D8 Q R */ + 0x51, 0x52, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + /*E0 \ S T U V W X */ + 0x5C, 0x00, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, + /*E8 Y Z */ + 0x59, 0x5A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + /*F0 0 1 2 3 4 5 6 7 */ + 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, + /*F8 8 9 */ + 0x38, 0x39, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF +}; + +/* ebcdic translation tables needed for 3270 support */ +static void +i370_ebcdic (unused) + int unused; +{ + char *p, *end; + char delim = 0; + size_t nbytes; + + nbytes = strlen (input_line_pointer); + end = input_line_pointer + nbytes; + while ('\r' == *end) end --; + while ('\n' == *end) end --; + + delim = *input_line_pointer; + if (('\'' == delim) || ('\"' == delim)) { + input_line_pointer ++; + end = rindex (input_line_pointer, delim); + } + + if (end > input_line_pointer) + { + nbytes = end - input_line_pointer +1; + p = frag_more (nbytes); + while (end > input_line_pointer) + { + *p = ascebc [(unsigned char)(*input_line_pointer)]; + ++p; ++input_line_pointer; + } + *p = '\0'; + } + if (delim == *input_line_pointer) ++input_line_pointer; +} + + +/* stub out a couple of routines */ +static void +i370_rmode (unused) + int unused; +{ + as_tsktsk ("rmode ignored"); +} + +static void +i370_dsect (sect) + int sect; +{ + char *save_line = input_line_pointer; + static char section[] = ".data\n"; + + /* Just pretend this is .section .data */ + input_line_pointer = section; + obj_elf_section (sect); + + input_line_pointer = save_line; +} + +static void +i370_csect (unused) + int unused; +{ + as_tsktsk ("csect not supported"); +} + + +/* DC Define Const is only partially supported. + * For samplecode on what to do, look at i370_elf_cons() above. + * This code handles pseudoops of the style + * DC D'3.141592653' # in sysv4, .double 3.14159265 + * DC F'1' # in sysv4, .long 1 + */ +static void +i370_dc(unused) + int unused; +{ + char * p, tmp[50]; + int nbytes=0; + expressionS exp; + char type=0; + + if (is_it_end_of_statement ()) + { + demand_empty_rest_of_line (); + return; + } + + /* figure out the size */ + type = *input_line_pointer++; + switch (type) + { + case 'H': /* 16-bit */ + nbytes = 2; + break; + case 'E': /* 32-bit */ + case 'F': /* 32-bit */ + nbytes = 4; + break; + case 'D': /* 64-bit */ + nbytes = 8; + break; + default: + as_bad ("unsupported DC type"); + return; + } + + /* get rid of pesky quotes */ + if ('\'' == *input_line_pointer) + { + char * close; + ++input_line_pointer; + close = strchr (input_line_pointer, '\''); + if (close) + *close= ' '; + else + as_bad ("missing end-quote"); + } + if ('\"' == *input_line_pointer) + { + char * close; + ++input_line_pointer; + close = strchr (input_line_pointer, '\"'); + if (close) + *close= ' '; + else + as_bad ("missing end-quote"); + } + + switch (type) + { + case 'H': /* 16-bit */ + case 'F': /* 32-bit */ + expression (&exp); + emit_expr (&exp, nbytes); + break; + case 'E': /* 32-bit */ + case 'D': /* 64-bit */ + md_atof (type, tmp, &nbytes); + p = frag_more (nbytes); + memcpy (p, tmp, nbytes); + break; + default: + as_bad ("unsupported DC type"); + return; + } + + demand_empty_rest_of_line (); +} + + +/* provide minimal support for DS Define Storage */ +static void +i370_ds (unused) + int unused; +{ + /* DS 0H or DS 0F or DS 0D */ + if ('0' == *input_line_pointer) + { + int alignment = 0; /* left shift 1<<align */ + input_line_pointer ++; + switch (*input_line_pointer++) + { + case 'H': /* 16-bit */ + alignment = 1; + break; + case 'F': /* 32-bit */ + alignment = 2; + break; + case 'D': /* 64-bit */ + alignment = 3; + break; + default: + as_bad ("unsupported alignment"); + return; + } + frag_align (alignment, 0, 0); + record_alignment (now_seg, alignment); + } + else + { + as_bad ("this DS form not yet supported"); + } +} + +/* Solaris pseudo op to change to the .rodata section. */ +static void +i370_elf_rdata (sect) + int sect; +{ + char *save_line = input_line_pointer; + static char section[] = ".rodata\n"; + + /* Just pretend this is .section .rodata */ + input_line_pointer = section; + obj_elf_section (sect); + + input_line_pointer = save_line; +} + +/* Pseudo op to make file scope bss items */ +static void +i370_elf_lcomm(unused) + int unused; +{ + register char *name; + register char c; + register char *p; + offsetT size; + register symbolS *symbolP; + offsetT align; + segT old_sec; + int old_subsec; + char *pfrag; + int align2; + + name = input_line_pointer; + c = get_symbol_end (); + + /* just after name is now '\0' */ + p = input_line_pointer; + *p = c; + SKIP_WHITESPACE (); + if (*input_line_pointer != ',') + { + as_bad ("Expected comma after symbol-name: rest of line ignored."); + ignore_rest_of_line (); + return; + } + + input_line_pointer++; /* skip ',' */ + if ((size = get_absolute_expression ()) < 0) + { + as_warn (".COMMon length (%ld.) <0! Ignored.", (long) size); + ignore_rest_of_line (); + return; + } + + /* The third argument to .lcomm is the alignment. */ + if (*input_line_pointer != ',') + align = 8; + else + { + ++input_line_pointer; + align = get_absolute_expression (); + if (align <= 0) + { + as_warn ("ignoring bad alignment"); + align = 8; + } + } + + *p = 0; + symbolP = symbol_find_or_make (name); + *p = c; + + if (S_IS_DEFINED (symbolP) && ! S_IS_COMMON (symbolP)) + { + as_bad ("Ignoring attempt to re-define symbol `%s'.", + S_GET_NAME (symbolP)); + ignore_rest_of_line (); + return; + } + + if (S_GET_VALUE (symbolP) && S_GET_VALUE (symbolP) != (valueT) size) + { + as_bad ("Length of .lcomm \"%s\" is already %ld. Not changed to %ld.", + S_GET_NAME (symbolP), + (long) S_GET_VALUE (symbolP), + (long) size); + + ignore_rest_of_line (); + return; + } + + /* allocate_bss: */ + old_sec = now_seg; + old_subsec = now_subseg; + if (align) + { + /* convert to a power of 2 alignment */ + for (align2 = 0; (align & 1) == 0; align >>= 1, ++align2) + ; + if (align != 1) + { + as_bad ("Common alignment not a power of 2"); + ignore_rest_of_line (); + return; + } + } + else + align2 = 0; + + record_alignment (bss_section, align2); + subseg_set (bss_section, 0); + if (align2) + frag_align (align2, 0, 0); + if (S_GET_SEGMENT (symbolP) == bss_section) + symbol_get_frag (symbolP)->fr_symbol = 0; + symbol_set_frag (symbolP, frag_now); + pfrag = frag_var (rs_org, 1, 1, (relax_substateT) 0, symbolP, size, + (char *) 0); + *pfrag = 0; + S_SET_SIZE (symbolP, size); + S_SET_SEGMENT (symbolP, bss_section); + subseg_set (old_sec, old_subsec); + demand_empty_rest_of_line (); +} + +/* Validate any relocations emitted for -mrelocatable, possibly adding + fixups for word relocations in writable segments, so we can adjust + them at runtime. */ +static void +i370_elf_validate_fix (fixp, seg) + fixS *fixp; + segT seg; +{ + if (fixp->fx_done || fixp->fx_pcrel) + return; + + switch (shlib) + { + case SHLIB_NONE: + case SHLIB_PIC: + return; + + case SHILB_MRELOCATABLE: + if (fixp->fx_r_type <= BFD_RELOC_UNUSED + && fixp->fx_r_type != BFD_RELOC_16_GOTOFF + && fixp->fx_r_type != BFD_RELOC_HI16_GOTOFF + && fixp->fx_r_type != BFD_RELOC_LO16_GOTOFF + && fixp->fx_r_type != BFD_RELOC_HI16_S_GOTOFF + && fixp->fx_r_type != BFD_RELOC_32_BASEREL + && fixp->fx_r_type != BFD_RELOC_LO16_BASEREL + && fixp->fx_r_type != BFD_RELOC_HI16_BASEREL + && fixp->fx_r_type != BFD_RELOC_HI16_S_BASEREL + && strcmp (segment_name (seg), ".got2") != 0 + && strcmp (segment_name (seg), ".dtors") != 0 + && strcmp (segment_name (seg), ".ctors") != 0 + && strcmp (segment_name (seg), ".fixup") != 0 + && strcmp (segment_name (seg), ".stab") != 0 + && strcmp (segment_name (seg), ".gcc_except_table") != 0 + && strcmp (segment_name (seg), ".ex_shared") != 0) + { + if ((seg->flags & (SEC_READONLY | SEC_CODE)) != 0 + || fixp->fx_r_type != BFD_RELOC_CTOR) + { + as_bad_where (fixp->fx_file, fixp->fx_line, + "Relocation cannot be done when using -mrelocatable"); + } + } + return; + } +} +#endif /* OBJ_ELF */ + + + +#define LITERAL_POOL_SUPPORT +#ifdef LITERAL_POOL_SUPPORT +/* Provide support for literal pools within the text section. */ +/* Loosely based on similar code from tc-arm.c */ +/* + * We will use four symbols to locate four parts of the literal pool. + * These four sections contain 64,32,16 and 8-bit constants; we use + * four sections so that all memory access can be appropriately aligned. + * That is, we want to avoid mixing these together so that we don't + * waste space padding out to alignments. The four pointers + * longlong_poolP, word_poolP, etc. point to a symbol labeling the + * start of each pool part. + * + * lit_pool_num increments from zero to infinity and uniquely id's + * -- its used to generate the *_poolP symbol name. + */ + +#define MAX_LITERAL_POOL_SIZE 1024 + +typedef struct literalS +{ + struct expressionS exp; + char * sym_name; + char size; /* 1,2,4 or 8 */ + short offset; +} literalT; + +literalT literals[MAX_LITERAL_POOL_SIZE]; +int next_literal_pool_place = 0; /* Next free entry in the pool */ + +static symbolS *longlong_poolP = NULL; /* 64-bit pool entries */ +static symbolS *word_poolP = NULL; /* 32-bit pool entries */ +static symbolS *short_poolP = NULL; /* 16-bit pool entries */ +static symbolS *byte_poolP = NULL; /* 8-bit pool entries */ + +static int lit_pool_num = 1; + +/* create a new, empty symbol */ +static symbolS * +symbol_make_empty (void) +{ + return symbol_create (FAKE_LABEL_NAME, undefined_section, + (valueT) 0, &zero_address_frag); +} + +/* add an expression to the literal pool */ +static void +add_to_lit_pool (expressionS *exx, char *name, int sz) +{ + int lit_count = 0; + int offset_in_pool = 0; + + /* start a new pool, if necessary */ + if (8 == sz && NULL == longlong_poolP) + longlong_poolP = symbol_make_empty(); + else if (4 == sz && NULL == word_poolP) + word_poolP = symbol_make_empty(); + else if (2 == sz && NULL == short_poolP) + short_poolP = symbol_make_empty(); + else if (1 == sz && NULL == byte_poolP) + byte_poolP = symbol_make_empty(); + + /* Check if this literal value is already in the pool: */ + /* hack alert -- we should probably be checking expressions + * of type O_symbol as well ... */ + /* hack alert XXX this is probably(certainly?) broken for O_big, + * which includes 64-bit long-longs ... + */ + while (lit_count < next_literal_pool_place) + { + if (exx->X_op == O_constant + && literals[lit_count].exp.X_op == exx->X_op + && literals[lit_count].exp.X_add_number == exx->X_add_number + && literals[lit_count].exp.X_unsigned == exx->X_unsigned + && literals[lit_count].size == sz) + break; + else if (literals[lit_count].sym_name + && name + && !strcmp (name, literals[lit_count].sym_name)) + break; + if (sz == literals[lit_count].size) + offset_in_pool += sz; + lit_count ++; + } + + if (lit_count == next_literal_pool_place) /* new entry */ + { + if (next_literal_pool_place > MAX_LITERAL_POOL_SIZE) + { + as_bad("Literal Pool Overflow"); + } + + literals[next_literal_pool_place].exp = *exx; + literals[next_literal_pool_place].size = sz; + literals[next_literal_pool_place].offset = offset_in_pool; + if (name) + { + literals[next_literal_pool_place].sym_name = strdup (name); + } + else + { + literals[next_literal_pool_place].sym_name = NULL; + } + next_literal_pool_place++; + } + + /* ???_poolP points to the begining of the literal pool. + * X_add_number is the offset from the begining of the + * literal pool to this expr minus the location of the most + * recent .using directive. Thus, the grand total value of the + * expression is the distance from .using to the literal. + */ + if (8 == sz) + exx->X_add_symbol = longlong_poolP; + else if (4 == sz) + exx->X_add_symbol = word_poolP; + else if (2 == sz) + exx->X_add_symbol = short_poolP; + else if (1 == sz) + exx->X_add_symbol = byte_poolP; + exx->X_add_number = offset_in_pool; + exx->X_op_symbol = NULL; + + /* If the user has set up a base reg in another section, + * use that; otherwise use the text section. */ + if (0 < i370_using_other_regno) + { + i370_make_relative (exx, &i370_using_other_baseaddr); + } + else + { + i370_make_relative (exx, &i370_using_text_baseaddr); + } +} + +/* The symbol setup for the literal pool is done in two steps. First, + * a symbol that represents the start of the literal pool is created, + * above, in the add_to_pool() routine. This sym ???_poolP. + * However, we don't know what fragment its in until a bit later. + * So we defer the frag_now thing, and the symbol name, until .ltorg time + */ + +/* Can't use symbol_new here, so have to create a symbol and then at + a later date assign it a value. Thats what these functions do */ +static void +symbol_locate (symbolP, name, segment, valu, frag) + symbolS *symbolP; + CONST char *name; /* It is copied, the caller can modify */ + segT segment; /* Segment identifier (SEG_<something>) */ + valueT valu; /* Symbol value */ + fragS *frag; /* Associated fragment */ +{ + size_t name_length; + char *preserved_copy_of_name; + + name_length = strlen (name) + 1; /* +1 for \0 */ + obstack_grow (¬es, name, name_length); + preserved_copy_of_name = obstack_finish (¬es); + + S_SET_NAME (symbolP, preserved_copy_of_name); + + S_SET_SEGMENT (symbolP, segment); + S_SET_VALUE (symbolP, valu); + symbol_clear_list_pointers(symbolP); + + symbol_set_frag (symbolP, frag); + + /* + * Link to end of symbol chain. + */ + { + extern int symbol_table_frozen; + if (symbol_table_frozen) + abort (); + } + + symbol_append (symbolP, symbol_lastP, &symbol_rootP, &symbol_lastP); + + obj_symbol_new_hook (symbolP); + +#ifdef tc_symbol_new_hook + tc_symbol_new_hook (symbolP); +#endif + +#define DEBUG_SYMS +#ifdef DEBUG_SYMS + verify_symbol_chain(symbol_rootP, symbol_lastP); +#endif /* DEBUG_SYMS */ +} + +/* i370_addr_offset() will convert operand expressions + * that appear to be absolute into thier base-register + * relative form. These expressions come in two types: + * + * (1) of the form "* + const" * where "*" means + * relative offset since the last using + * i.e. "*" means ".-using_baseaddr" + * + * (2) labels, which are never absolute, but are always + * relative to the last "using". Anything with an alpha + * character is considered to be a label (since symbols + * can never be operands), and since we've already handled + * register operands. For example, "BL .L33" branch low + * to .L33 RX form insn frequently terminates for-loops, + */ +static boolean +i370_addr_offset (expressionS *exx) +{ + char *dot, *lab; + int islabel = 0; + int all_digits = 0; + + /* search for a label; anything with an alpha char will do */ + /* local labels consist of N digits followed by either b or f */ + lab = input_line_pointer; + while (*lab && (',' != *lab) && ('(' != *lab)) + { + if (isdigit(*lab)) + { + all_digits = 1; + } + else if (isalpha(*lab)) + { + if (!all_digits) + { + islabel = 1; + break; + } + else if (('f' == *lab) || ('b' == *lab)) + { + islabel = 1; + break; + } + if (all_digits) + break; + } + else if ('.' != *lab) + break; + ++lab; + } + + /* See if operand has a * in it */ + dot = strchr (input_line_pointer, '*'); + + if (!dot && !islabel) + return false; + + /* replace * with . and let expr munch on it. */ + if (dot) + *dot = '.'; + expression (exx); + + /* OK, now we have to subtract the "using" location */ + /* normally branches appear in the text section only... */ + if (0 == strncmp (now_seg->name, ".text", 5) || 0 > i370_using_other_regno) + { + i370_make_relative (exx, &i370_using_text_baseaddr); + } + else + { + i370_make_relative (exx, &i370_using_other_baseaddr); + } + + /* put the * back */ + if (dot) + *dot = '*'; + + return true; +} + +/* handle address constants of various sorts */ +/* The currently supported types are + * =A(some_symb) + * =V(some_extern) + * =X'deadbeef' hexadecimal + * =F'1234' 32-bit const int + * =H'1234' 16-bit const int + */ +static boolean +i370_addr_cons (expressionS *exp) +{ + char *name; + char *sym_name, delim; + int name_len; + int hex_len=0; + int cons_len=0; + + name = input_line_pointer; + sym_name = input_line_pointer; + /* Find the spelling of the operand */ + if (name[0] == '=' && isalpha (name[1])) + { + name = ++input_line_pointer; + } + else + { + return false; + } + switch (name[0]) + { + case 'A': + case 'V': + /* A == address-of */ + /* V == extern */ + ++input_line_pointer; + expression (exp); + + /* we use a simple string name to collapse together + * multiple refrences to the same address literal + */ + name_len = strcspn (sym_name, ", "); + delim = *(sym_name + name_len); + *(sym_name + name_len) = 0x0; + add_to_lit_pool (exp, sym_name, 4); + *(sym_name + name_len) = delim; + + break; + case 'H': + case 'F': + case 'X': + case 'E': /* single-precision float point */ + case 'D': /* double-precision float point */ + + /* H == 16-bit fixed-point const; expression must be const */ + /* F == fixed-point const; expression must be const */ + /* X == fixed-point const; expression must be const */ + if ('H' == name[0]) cons_len = 2; + else if ('F' == name[0]) cons_len = 4; + else if ('X' == name[0]) cons_len = -1; + else if ('E' == name[0]) cons_len = 4; + else if ('D' == name[0]) cons_len = 8; + + /* extract length, if it is present; hack alert -- assume single-digit + * length */ + if ('L' == name[1]) + { + cons_len = name[2] - '0'; /* should work for ascii and ebcdic */ + input_line_pointer += 2; + } + + ++input_line_pointer; + + /* get rid of pesky quotes */ + if ('\'' == *input_line_pointer) + { + char * close; + ++input_line_pointer; + close = strchr (input_line_pointer, '\''); + if (close) + *close= ' '; + else + as_bad ("missing end-quote"); + } + if ('\"' == *input_line_pointer) + { + char * close; + ++input_line_pointer; + close = strchr (input_line_pointer, '\"'); + if (close) + *close= ' '; + else + as_bad ("missing end-quote"); + } + if (('X' == name[0]) || ('E' == name[0]) || ('D' == name[0])) + { + char tmp[50]; + char *save; + + /* The length of hex constants is specified directly with L, + * or implied through the number of hex digits. For example: + * =X'AB' one byte + * =X'abcd' two bytes + * =X'000000AB' four bytes + * =XL4'AB' four bytes, left-padded withn zero + */ + if (('X' == name[0]) && (0 > cons_len)) + { + save = input_line_pointer; + while (*save) + { + if (isxdigit(*save)) + hex_len++; + save++; + } + cons_len = (hex_len+1) /2; + } + /* I beleive this works even for =XL8'dada0000beeebaaa' + * which should parse out to X_op == O_big + * Note that floats and doubles get represented as + * 0d3.14159265358979 or 0f 2.7 + */ + tmp[0] = '0'; + tmp[1] = name[0]; + tmp[2] = 0; + strcat (tmp, input_line_pointer); + save = input_line_pointer; + input_line_pointer = tmp; + expression (exp); + input_line_pointer = save + (input_line_pointer-tmp-2); + + /* fix up lengths for floats and doubles */ + if (O_big == exp->X_op) + { + exp->X_add_number = cons_len / CHARS_PER_LITTLENUM; + } + } + else + { + expression (exp); + } + /* O_big occurs when more than 4 bytes worth gets parsed */ + if ((exp->X_op != O_constant) && (exp->X_op != O_big)) + { + as_bad ("expression not a constant"); + return false; + } + add_to_lit_pool (exp, 0x0, cons_len); + break; + + default: + as_bad ("Unknown/unsupported address literal type"); + return false; + } + + return true; +} + + +/* Dump the contents of the literal pool that we've accumulated so far. + * This aligns the pool to the size of the largest literal in the pool. + */ + +static void +i370_ltorg (ignore) + int ignore; +{ + int litsize; + int lit_count = 0; + int biggest_literal_size = 0; + int biggest_align = 0; + char pool_name[20]; + + if (strncmp (now_seg->name, ".text", 5)) + { + if (i370_other_section == undefined_section) + { + as_bad (".ltorg without prior .using in section %s", + now_seg->name); + } + if (i370_other_section != now_seg) + { + as_bad (".ltorg in section %s paired to .using in section %s", + now_seg->name, i370_other_section->name); + } + } + if (! longlong_poolP + && ! word_poolP + && ! short_poolP + && ! byte_poolP) + { + /* Nothing to do */ + /* as_tsktsk ("Nothing to put in the pool\n"); */ + return; + } + + /* find largest literal .. 2 4 or 8 */ + lit_count = 0; + while (lit_count < next_literal_pool_place) + { + if (biggest_literal_size < literals[lit_count].size) + biggest_literal_size = literals[lit_count].size; + lit_count ++; + } + if (1 == biggest_literal_size) biggest_align = 0; + else if (2 == biggest_literal_size) biggest_align = 1; + else if (4 == biggest_literal_size) biggest_align = 2; + else if (8 == biggest_literal_size) biggest_align = 3; + else as_bad ("bad alignment of %d bytes in literal pool", biggest_literal_size); + if (0 == biggest_align) biggest_align = 1; + + + /* Align pool for short, word, double word accesses */ + frag_align (biggest_align, 0, 0); + record_alignment (now_seg, biggest_align); + + /* Note that the gas listing will print only the first five + * entries in the pool .... wonder how to make it print more ... + */ + /* output largest literals first, then the smaller ones. */ + for (litsize=8; litsize; litsize /=2) + { + symbolS *current_poolP = NULL; + switch (litsize) + { + case 8: + current_poolP = longlong_poolP; break; + case 4: + current_poolP = word_poolP; break; + case 2: + current_poolP = short_poolP; break; + case 1: + current_poolP = byte_poolP; break; + default: + as_bad ("bad literal size\n"); + } + if (NULL == current_poolP) + continue; + sprintf (pool_name, ".LITP%01d%06d", litsize, lit_pool_num); + symbol_locate (current_poolP, pool_name, now_seg, + (valueT) frag_now_fix (), frag_now); + symbol_table_insert (current_poolP); + + lit_count = 0; + while (lit_count < next_literal_pool_place) + { + if (litsize == literals[lit_count].size) + { +#define EMIT_ADDR_CONS_SYMBOLS +#ifdef EMIT_ADDR_CONS_SYMBOLS + /* create a bogus symbol, add it to the pool ... + * For the most part, I think this is a useless excercise, + * except that having these symbol names in the objects + * is vaguely useful for debugging ... + */ + if (literals[lit_count].sym_name) + { + symbolS * symP = symbol_make_empty(); + symbol_locate (symP, literals[lit_count].sym_name, now_seg, + (valueT) frag_now_fix (), frag_now); + symbol_table_insert (symP); + } +#endif /* EMIT_ADDR_CONS_SYMBOLS */ + + emit_expr (&(literals[lit_count].exp), literals[lit_count].size); + } + lit_count ++; + } + } + + next_literal_pool_place = 0; + longlong_poolP = NULL; + word_poolP = NULL; + short_poolP = NULL; + byte_poolP = NULL; + lit_pool_num++; +} + +#endif /* LITERAL_POOL_SUPPORT */ + + +/* add support for the HLASM-like USING directive to indicate + * the base register to use ... we don't support the full + * hlasm semantics for this ... we merely pluck a base address + * and a register number out. We print a warning if using is + * called multiple times. I suppose we should check to see + * if the regno is valid ... + */ +static void +i370_using (ignore) + int ignore; +{ + expressionS ex, baseaddr; + int iregno; + char *star; + + /* if "*" appears in a using, it means "." */ + /* replace it with "." so that expr doesn't get confused. */ + star = strchr (input_line_pointer, '*'); + if (star) + *star = '.'; + + /* the first arg to using will usually be ".", but it can + * be a more complex exprsssion too ... */ + expression (&baseaddr); + if (star) + *star = '*'; + if (O_constant != baseaddr.X_op + && O_symbol != baseaddr.X_op + && O_uminus != baseaddr.X_op) + { + as_bad (".using: base address expression illegal or too complex"); + } + + if (*input_line_pointer != '\0') ++input_line_pointer; + + /* the second arg to using had better be a register */ + register_name (&ex); + demand_empty_rest_of_line (); + iregno = ex.X_add_number; + + if (0 == strncmp (now_seg->name, ".text", 5)) + { + i370_using_text_baseaddr = baseaddr; + i370_using_text_regno = iregno; + } + else + { + i370_using_other_baseaddr = baseaddr; + i370_using_other_regno = iregno; + i370_other_section = now_seg; + } +} + +static void +i370_drop (ignore) + int ignore; +{ + expressionS ex; + int iregno; + + register_name (&ex); + demand_empty_rest_of_line (); + iregno = ex.X_add_number; + + if (0 == strncmp (now_seg->name, ".text", 5)) + { + if (iregno != i370_using_text_regno) + { + as_bad ("droping register %d in section %s does not match using register %d", + iregno, now_seg->name, i370_using_text_regno); + } + i370_using_text_regno = -1; + i370_using_text_baseaddr.X_op = O_absent; + } + else + { + if (iregno != i370_using_other_regno) + { + as_bad ("droping register %d in section %s does not match using register %d", + iregno, now_seg->name, i370_using_other_regno); + } + if (i370_other_section != now_seg) + { + as_bad ("droping register %d in section %s previously used in section %s", + iregno, now_seg->name, i370_other_section->name); + } + i370_using_other_regno = -1; + i370_using_other_baseaddr.X_op = O_absent; + i370_other_section = undefined_section; + } +} + +/* Make the first argument an address-relative expression + * by subtracting the second argument. + */ +static void +i370_make_relative (expressionS *exx, expressionS *baseaddr) +{ + + if (O_constant == baseaddr->X_op) + { + exx->X_op = O_symbol; + exx->X_add_number -= baseaddr->X_add_number; + } + else if (O_symbol == baseaddr->X_op) + { + exx->X_op = O_subtract; + exx->X_op_symbol = baseaddr->X_add_symbol; + exx->X_add_number -= baseaddr->X_add_number; + } + else if (O_uminus == baseaddr->X_op) + { + exx->X_op = O_add; + exx->X_op_symbol = baseaddr->X_add_symbol; + exx->X_add_number += baseaddr->X_add_number; + } + else + { + as_bad ("Missing or bad .using directive"); + } +} + +/* We need to keep a list of fixups. We can't simply generate them as + we go, because that would require us to first create the frag, and + that would screw up references to ``.''. */ + +struct i370_fixup +{ + expressionS exp; + int opindex; + bfd_reloc_code_real_type reloc; +}; + +#define MAX_INSN_FIXUPS (5) + +/* This routine is called for each instruction to be assembled. */ + +void +md_assemble (str) + char *str; +{ + char *s, *opcode_str; + const struct i370_opcode *opcode; + i370_insn_t insn; + const unsigned char *opindex_ptr; + int have_optional_index, have_optional_basereg, have_optional_reg; + int skip_optional_index, skip_optional_basereg, skip_optional_reg; + int use_text=0, use_other=0; + int off_by_one; + struct i370_fixup fixups[MAX_INSN_FIXUPS]; + int fc; + char *f; + int i; +#ifdef OBJ_ELF + bfd_reloc_code_real_type reloc; +#endif + + /* Get the opcode. */ + for (s = str; *s != '\0' && ! isspace (*s); s++) + ; + if (*s != '\0') + *s++ = '\0'; + opcode_str = str; + + /* Look up the opcode in the hash table. */ + opcode = (const struct i370_opcode *) hash_find (i370_hash, str); + if (opcode == (const struct i370_opcode *) NULL) + { + const struct i370_macro *macro; + + assert (i370_macro_hash); + macro = (const struct i370_macro *) hash_find (i370_macro_hash, str); + if (macro == (const struct i370_macro *) NULL) + as_bad ("Unrecognized opcode: `%s'", str); + else + i370_macro (s, macro); + + return; + } + + insn = opcode->opcode; + + str = s; + while (isspace (*str)) + ++str; + + /* I370 operands are either expressions or address constants. + Many operand types are optional. The optional operands + are always surrounded by parens, and are used to denote the base + register ... e.g. "A R1, D2" or "A R1, D2(,B2) as opposed to + the fully-formed "A R1, D2(X2,B2)". Note also the = sign, + such as A R1,=A(i) where the address-of operator =A implies + use of both a base register, and a missing index register. + + So, before we start seriously parsing the operands, we check + to see if we have an optional operand, and, if we do, we count + the number of commas to see which operand should be omitted. */ + + have_optional_index = have_optional_basereg = have_optional_reg = 0; + for (opindex_ptr = opcode->operands; *opindex_ptr != 0; opindex_ptr++) + { + const struct i370_operand *operand; + operand = &i370_operands[*opindex_ptr]; + if ((operand->flags & I370_OPERAND_INDEX) != 0) + have_optional_index = 1; + if ((operand->flags & I370_OPERAND_BASE) != 0) + have_optional_basereg = 1; + if ((operand->flags & I370_OPERAND_OPTIONAL) != 0) + have_optional_reg = 1; + } + + skip_optional_index = skip_optional_basereg = skip_optional_reg = 0; + if (have_optional_index || have_optional_basereg) + { + unsigned int opcount, nwanted; + + /* There is an optional operand. Count the number of + commas and open-parens in the input line. */ + if (*str == '\0') + opcount = 0; + else + { + opcount = 1; + s = str; + while ((s = strpbrk (s, ",(=")) != (char *) NULL) + { + ++opcount; + ++s; + if (',' == *s) ++s; /* avoid counting things like (, */ + if ('=' == *s) { ++s; --opcount; } + } + } + + /* If there are fewer operands in the line then are called + for by the instruction, we want to skip the optional + operand. */ + nwanted = strlen (opcode->operands); + if (have_optional_index) + { + if (opcount < nwanted) + skip_optional_index = 1; + if (have_optional_basereg && ((opcount+1) < nwanted)) + skip_optional_basereg = 1; + if (have_optional_reg && ((opcount+1) < nwanted)) + skip_optional_reg = 1; + } + else + { + if (have_optional_basereg && (opcount < nwanted)) + skip_optional_basereg = 1; + if (have_optional_reg && (opcount < nwanted)) + skip_optional_reg = 1; + } + } + + /* Perform some off-by-one hacks on the length field of certain instructions. + * Its such a shame to have to do this, but the problem is that HLASM got + * defined so that the lengths differ by one from the actual machine instructions. + * this code should probably be moved to a special inster-operand routine. + * Sigh. Affected instructions are Compare Logical, Move and Exclusive OR + * hack alert -- aren't *all* SS instructions affected ?? + */ + off_by_one = 0; + if (0 == strcasecmp ("CLC", opcode->name) + || 0 == strcasecmp ("ED", opcode->name) + || 0 == strcasecmp ("EDMK", opcode->name) + || 0 == strcasecmp ("MVC", opcode->name) + || 0 == strcasecmp ("MVCIN", opcode->name) + || 0 == strcasecmp ("MVN", opcode->name) + || 0 == strcasecmp ("MVZ", opcode->name) + || 0 == strcasecmp ("NC", opcode->name) + || 0 == strcasecmp ("OC", opcode->name) + || 0 == strcasecmp ("XC", opcode->name)) + off_by_one = 1; + + /* Gather the operands. */ + fc = 0; + for (opindex_ptr = opcode->operands; *opindex_ptr != 0; opindex_ptr++) + { + const struct i370_operand *operand; + const char *errmsg; + char *hold; + expressionS ex; + + operand = &i370_operands[*opindex_ptr]; + errmsg = NULL; + + /* If this is an index operand, and we are skipping it, + just insert a zero. */ + if (skip_optional_index && + ((operand->flags & I370_OPERAND_INDEX) != 0)) + { + insn = i370_insert_operand (insn, operand, 0); + continue; + } + + /* If this is the base operand, and we are skipping it, + just insert the current using basreg. */ + if (skip_optional_basereg && + ((operand->flags & I370_OPERAND_BASE) != 0)) + { + int basereg = -1; + if (use_text) + { + if (0 == strncmp (now_seg->name, ".text", 5) + || 0 > i370_using_other_regno) + { + basereg = i370_using_text_regno; + } + else + { + basereg = i370_using_other_regno; + } + } + else if (use_other) + { + if (0 > i370_using_other_regno) + { + basereg = i370_using_text_regno; + } + else + { + basereg = i370_using_other_regno; + } + } + if (0 > basereg) + { + as_bad ("not using any base register"); + } + insn = i370_insert_operand (insn, operand, basereg); + continue; + } + + /* If this is an optional operand, and we are skipping it, + Use zero (since a non-zero value would denote a register) */ + if (skip_optional_reg + && ((operand->flags & I370_OPERAND_OPTIONAL) != 0)) + { + insn = i370_insert_operand (insn, operand, 0); + continue; + } + + /* Gather the operand. */ + hold = input_line_pointer; + input_line_pointer = str; + + /* register names are only allowed where there are registers ... */ + if ((operand->flags & I370_OPERAND_GPR) != 0) + { + /* quickie hack to get past things like (,r13) */ + if (skip_optional_index && (',' == *input_line_pointer)) + { + *input_line_pointer = ' '; + input_line_pointer ++; + } + if (! register_name (&ex)) + { + as_bad ("expecting a register for operand %d", + opindex_ptr - opcode->operands + 1); + } + } + + /* check for a address constant expression */ + /* We will put PSW-relative addresses in the text section, + * and adress literals in the .data (or other) section. */ + else if (i370_addr_cons (&ex)) + use_other=1; + else if (i370_addr_offset (&ex)) + use_text=1; + else expression (&ex); + + str = input_line_pointer; + input_line_pointer = hold; + + /* perform some off-by-one hacks on the length field of certain instructions. + * Its such a shame to have to do this, but the problem is that HLASM got + * defined so that the programmer specifies a length that is one greater + * than what the machine instruction wants. + * Sigh. + */ + if (off_by_one && (0 == strcasecmp ("SS L", operand->name))) + { + ex.X_add_number --; + } + + if (ex.X_op == O_illegal) + as_bad ("illegal operand"); + else if (ex.X_op == O_absent) + as_bad ("missing operand"); + else if (ex.X_op == O_register) + { + insn = i370_insert_operand (insn, operand, ex.X_add_number); + } + else if (ex.X_op == O_constant) + { +#ifdef OBJ_ELF + /* Allow @HA, @L, @H on constants. + * Well actually, no we don't; there really don't make sense + * (at least not to me) for the i370. However, this code is + * left here for any dubious future expansion reasons ... */ + char *orig_str = str; + + if ((reloc = i370_elf_suffix (&str, &ex)) != BFD_RELOC_UNUSED) + switch (reloc) + { + default: + str = orig_str; + break; + + case BFD_RELOC_LO16: + /* X_unsigned is the default, so if the user has done + something which cleared it, we always produce a + signed value. */ + ex.X_add_number = (((ex.X_add_number & 0xffff) + ^ 0x8000) + - 0x8000); + break; + + case BFD_RELOC_HI16: + ex.X_add_number = (ex.X_add_number >> 16) & 0xffff; + break; + + case BFD_RELOC_HI16_S: + ex.X_add_number = (((ex.X_add_number >> 16) & 0xffff) + + ((ex.X_add_number >> 15) & 1)); + break; + } +#endif + insn = i370_insert_operand (insn, operand, ex.X_add_number); + } +#ifdef OBJ_ELF + else if ((reloc = i370_elf_suffix (&str, &ex)) != BFD_RELOC_UNUSED) + { + as_tsktsk ("md_assemble(): suffixed relocations not supported\n"); + + /* We need to generate a fixup for this expression. */ + if (fc >= MAX_INSN_FIXUPS) + as_fatal ("too many fixups"); + fixups[fc].exp = ex; + fixups[fc].opindex = 0; + fixups[fc].reloc = reloc; + ++fc; + } +#endif /* OBJ_ELF */ + + else + { + /* We need to generate a fixup for this expression. */ + /* Typically, the expression will just be a symbol ... + * printf ("insn %s needs fixup for %s \n", + * opcode->name, ex.X_add_symbol->bsym->name); + */ + + if (fc >= MAX_INSN_FIXUPS) + as_fatal ("too many fixups"); + fixups[fc].exp = ex; + fixups[fc].opindex = *opindex_ptr; + fixups[fc].reloc = BFD_RELOC_UNUSED; + ++fc; + } + + /* skip over delimiter (close paren, or comma) */ + if ((')' == *str) && (',' == *(str+1))) + ++str; + if (*str != '\0') + ++str; + } + + while (isspace (*str)) + ++str; + + if (*str != '\0') + as_bad ("junk at end of line: `%s'", str); + + /* Write out the instruction. */ + f = frag_more (opcode->len); + if (4 >= opcode->len) + { + md_number_to_chars (f, insn.i[0], opcode->len); + } + else + { + md_number_to_chars (f, insn.i[0], 4); + if (6 == opcode->len) + { + md_number_to_chars ((f+4), ((insn.i[1])>>16), 2); + } + else + { + /* not used --- don't have any 8 byte instructions */ + as_bad ("Internal Error: bad instruction length"); + md_number_to_chars ((f+4), insn.i[1], opcode->len -4); + } + } + + /* Create any fixups. At this point we do not use a + bfd_reloc_code_real_type, but instead just use the + BFD_RELOC_UNUSED plus the operand index. This lets us easily + handle fixups for any operand type, although that is admittedly + not a very exciting feature. We pick a BFD reloc type in + md_apply_fix. */ + for (i = 0; i < fc; i++) + { + const struct i370_operand *operand; + + operand = &i370_operands[fixups[i].opindex]; + if (fixups[i].reloc != BFD_RELOC_UNUSED) + { + reloc_howto_type *reloc_howto = bfd_reloc_type_lookup (stdoutput, fixups[i].reloc); + int size; + fixS *fixP; + + if (!reloc_howto) + abort (); + + size = bfd_get_reloc_size (reloc_howto); + + if (size < 1 || size > 4) + abort(); + + printf (" gwana doo fixup %d \n", i); + fixP = fix_new_exp (frag_now, f - frag_now->fr_literal, size, + &fixups[i].exp, reloc_howto->pc_relative, + fixups[i].reloc); + + /* Turn off complaints that the addend is too large for things like + foo+100000@ha. */ + switch (fixups[i].reloc) + { + case BFD_RELOC_16_GOTOFF: + case BFD_RELOC_LO16: + case BFD_RELOC_HI16: + case BFD_RELOC_HI16_S: + fixP->fx_no_overflow = 1; + break; + default: + break; + } + } + else + { + fix_new_exp (frag_now, f - frag_now->fr_literal, opcode->len, + &fixups[i].exp, + (operand->flags & I370_OPERAND_RELATIVE) != 0, + ((bfd_reloc_code_real_type) + (fixups[i].opindex + (int) BFD_RELOC_UNUSED))); + } + } +} + +/* Handle a macro. Gather all the operands, transform them as + described by the macro, and call md_assemble recursively. All the + operands are separated by commas; we don't accept parentheses + around operands here. */ + +static void +i370_macro (str, macro) + char *str; + const struct i370_macro *macro; +{ + char *operands[10]; + unsigned int count; + char *s; + unsigned int len; + const char *format; + int arg; + char *send; + char *complete; + + /* Gather the users operands into the operands array. */ + count = 0; + s = str; + while (1) + { + if (count >= sizeof operands / sizeof operands[0]) + break; + operands[count++] = s; + s = strchr (s, ','); + if (s == (char *) NULL) + break; + *s++ = '\0'; + } + + if (count != macro->operands) + { + as_bad ("wrong number of operands"); + return; + } + + /* Work out how large the string must be (the size is unbounded + because it includes user input). */ + len = 0; + format = macro->format; + while (*format != '\0') + { + if (*format != '%') + { + ++len; + ++format; + } + else + { + arg = strtol (format + 1, &send, 10); + know (send != format && arg >= 0 && arg < count); + len += strlen (operands[arg]); + format = send; + } + } + + /* Put the string together. */ + complete = s = (char *) alloca (len + 1); + format = macro->format; + while (*format != '\0') + { + if (*format != '%') + *s++ = *format++; + else + { + arg = strtol (format + 1, &send, 10); + strcpy (s, operands[arg]); + s += strlen (s); + format = send; + } + } + *s = '\0'; + + /* Assemble the constructed instruction. */ + md_assemble (complete); +} + +#ifdef OBJ_ELF +/* For ELF, add support for SHF_EXCLUDE and SHT_ORDERED */ + +int +i370_section_letter (letter, ptr_msg) + int letter; + char **ptr_msg; +{ + if (letter == 'e') + return SHF_EXCLUDE; + + *ptr_msg = "Bad .section directive: want a,w,x,e in string"; + return 0; +} + +int +i370_section_word (str, len) + char *str; + size_t len; +{ + if (len == 7 && strncmp (str, "exclude", 7) == 0) + return SHF_EXCLUDE; + + return -1; +} + +int +i370_section_type (str, len) + char *str; + size_t len; +{ + if (len == 7 && strncmp (str, "ordered", 7) == 0) + return SHT_ORDERED; + + return -1; +} + +int +i370_section_flags (flags, attr, type) + int flags; + int attr; + int type; +{ + if (type == SHT_ORDERED) + flags |= SEC_ALLOC | SEC_LOAD | SEC_SORT_ENTRIES; + + if (attr & SHF_EXCLUDE) + flags |= SEC_EXCLUDE; + + return flags; +} +#endif /* OBJ_ELF */ + + +/* Pseudo-op handling. */ + +/* The .byte pseudo-op. This is similar to the normal .byte + pseudo-op, but it can also take a single ASCII string. */ + +static void +i370_byte (ignore) + int ignore; +{ + if (*input_line_pointer != '\"') + { + cons (1); + return; + } + + /* Gather characters. A real double quote is doubled. Unusual + characters are not permitted. */ + ++input_line_pointer; + while (1) + { + char c; + + c = *input_line_pointer++; + + if (c == '\"') + { + if (*input_line_pointer != '\"') + break; + ++input_line_pointer; + } + + FRAG_APPEND_1_CHAR (c); + } + + demand_empty_rest_of_line (); +} + +/* The .tc pseudo-op. This is used when generating XCOFF and ELF. + This takes two or more arguments. + + When generating XCOFF output, the first argument is the name to + give to this location in the toc; this will be a symbol with class + TC. The rest of the arguments are 4 byte values to actually put at + this location in the TOC; often there is just one more argument, a + relocateable symbol reference. + + When not generating XCOFF output, the arguments are the same, but + the first argument is simply ignored. */ + +static void +i370_tc (ignore) + int ignore; +{ + + /* Skip the TOC symbol name. */ + while (is_part_of_name (*input_line_pointer) + || *input_line_pointer == '[' + || *input_line_pointer == ']' + || *input_line_pointer == '{' + || *input_line_pointer == '}') + ++input_line_pointer; + + /* Align to a four byte boundary. */ + frag_align (2, 0, 0); + record_alignment (now_seg, 2); + + if (*input_line_pointer != ',') + demand_empty_rest_of_line (); + else + { + ++input_line_pointer; + cons (4); + } +} + +/* Turn a string in input_line_pointer into a floating point constant + of type type, and store the appropriate bytes in *litp. The number + of LITTLENUMS emitted is stored in *sizep . An error message is + returned, or NULL on OK. */ + +char * +md_atof (type, litp, sizep) + int type; + char *litp; + int *sizep; +{ + int prec; + LITTLENUM_TYPE words[4]; + char *t; + int i; + + switch (type) + { + case 'f': + case 'E': + type = 'f'; + prec = 2; + break; + + case 'd': + case 'D': + type = 'd'; + prec = 4; + break; + + default: + *sizep = 0; + return "bad call to md_atof"; + } + + /* 360/370/390 have two float formats: an old, funky 360 single-precision + * format, and the ieee format. Support only the ieee format. */ + t = atof_ieee (input_line_pointer, type, words); + if (t) + input_line_pointer = t; + + *sizep = prec * 2; + + for (i = 0; i < prec; i++) + { + md_number_to_chars (litp, (valueT) words[i], 2); + litp += 2; + } + + return NULL; +} + +/* Write a value out to the object file, using the appropriate + endianness. */ + +void +md_number_to_chars (buf, val, n) + char *buf; + valueT val; + int n; +{ + number_to_chars_bigendian (buf, val, n); +} + +/* Align a section (I don't know why this is machine dependent). */ + +valueT +md_section_align (seg, addr) + asection *seg; + valueT addr; +{ + int align = bfd_get_section_alignment (stdoutput, seg); + + return (addr + (1 << align) - 1) & (-1 << align); +} + +/* We don't have any form of relaxing. */ + +int +md_estimate_size_before_relax (fragp, seg) + fragS *fragp; + asection *seg; +{ + abort (); + return 0; +} + +/* Convert a machine dependent frag. We never generate these. */ + +void +md_convert_frag (abfd, sec, fragp) + bfd *abfd; + asection *sec; + fragS *fragp; +{ + abort (); +} + +/* We have no need to default values of symbols. */ + +/*ARGSUSED*/ +symbolS * +md_undefined_symbol (name) + char *name; +{ + return 0; +} + +/* Functions concerning relocs. */ + +/* The location from which a PC relative jump should be calculated, + given a PC relative reloc. */ + +long +md_pcrel_from_section (fixp, sec) + fixS *fixp; + segT sec; +{ + return fixp->fx_frag->fr_address + fixp->fx_where; +} + + +/* Apply a fixup to the object code. This is called for all the + fixups we generated by the call to fix_new_exp, above. In the call + above we used a reloc code which was the largest legal reloc code + plus the operand index. Here we undo that to recover the operand + index. At this point all symbol values should be fully resolved, + and we attempt to completely resolve the reloc. If we can not do + that, we determine the correct reloc code and put it back in the + fixup. + + See gas/cgen.c for more sample code and explanations of what's + going on here ... +*/ + +int +md_apply_fix3 (fixp, valuep, seg) + fixS *fixp; + valueT *valuep; + segT seg; +{ + valueT value; + + value = *valuep; + if (fixp->fx_addsy != NULL) + { + /* Notes: + Branches to labels will come in here with fixp->fx_pcrel set to 1 + and fixp->fx_subsy not null, and holding the value of the base + (i.e. the value of the .using). These we want to ignore. + + 'Strong' and 'weak' symbols will come in here with + fixp->fx_pcrel==0, fixp->fx_addsy defined, and + *valuep holding the value of the symbol. + + 'Strong' symbols will have S_GET_VALUE(fx_addsy) equal to zero, + whereas 'weak' symbols will have S_GET_VALUE(fx_addsy) set to the + symbol value (usually). + + We want to subtract S_GET_VALUE(fx_addsy) if it set, and + for all practical purposes, do a fixup with value zero. This + is because the linker/loader, at a later time, will do this + fixup with the correct value. If we fixup now with a value, + it will get double-fixed, leading to garbage. + + Note that subsy will also be set for strong/weak symbols + when the user program was compiled with -g. In that case, + subsy will hold the base address (i.e. the .using address). + */ + + if (fixp->fx_addsy->sy_used_in_reloc + && S_GET_SEGMENT (fixp->fx_addsy) != absolute_section + && S_GET_SEGMENT (fixp->fx_addsy) != undefined_section + && ! bfd_is_com_section (S_GET_SEGMENT (fixp->fx_addsy))) + value -= S_GET_VALUE (fixp->fx_addsy); + +#ifdef DEBUG + printf ("\nmd_apply_fix3: symbol %s at 0x%x (%s:%d) val=0x%x addend=0x%x\n", + S_GET_NAME (fixp->fx_addsy), + fixp->fx_frag->fr_address + fixp->fx_where, + fixp->fx_file, fixp->fx_line, + S_GET_VALUE (fixp->fx_addsy), value); +#endif + } + else + { + fixp->fx_done = 1; + return 1; + } + + /* Apply fixups to operands. Note that there should be no relocations + for any operands, since no instruction ever takes an operand + that requires reloc. */ + if ((int) fixp->fx_r_type >= (int) BFD_RELOC_UNUSED) + { + int opindex; + const struct i370_operand *operand; + char *where; + i370_insn_t insn; + + opindex = (int) fixp->fx_r_type - (int) BFD_RELOC_UNUSED; + + operand = &i370_operands[opindex]; + +#ifdef DEBUG + printf ("\nmd_apply_fix3: fixup operand %s at 0x%x in %s:%d addend=0x%x\n", + operand->name, + fixp->fx_frag->fr_address + fixp->fx_where, + fixp->fx_file, fixp->fx_line, + value); +#endif + /* Fetch the instruction, insert the fully resolved operand + value, and stuff the instruction back again. + fisxp->fx_size is the length of the instruction. */ + where = fixp->fx_frag->fr_literal + fixp->fx_where; + insn.i[0] = bfd_getb32 ((unsigned char *) where); + if (6 <= fixp->fx_size) + { /* deal with 48-bit insn's */ + insn.i[1] = bfd_getb32 (((unsigned char *) where)+4); + } + insn = i370_insert_operand (insn, operand, (offsetT) value); + bfd_putb32 ((bfd_vma) insn.i[0], (unsigned char *) where); + if (6 <= fixp->fx_size) + { /* deal with 48-bit insn's */ + bfd_putb32 ((bfd_vma) insn.i[1], (((unsigned char *) where)+4)); + } + + /* we are done, right? right !! */ + fixp->fx_done = 1; + if (fixp->fx_done) + { + /* Nothing else to do here. */ + return 1; + } + + /* Determine a BFD reloc value based on the operand information. + We are only prepared to turn a few of the operands into + relocs. In fact, we support *zero* operand relocations ... + Why? Because we are not expecting the compiler to generate + any operands that need relocation. Due to the 12-bit naturew of + i370 addressing, this would be unusual. */ +#if 0 + if ((operand->flags & I370_OPERAND_RELATIVE) != 0 + && operand->bits == 12 + && operand->shift == 0) + fixp->fx_r_type = BFD_RELOC_I370_D12; + else +#endif + { + char *sfile; + unsigned int sline; + + /* Use expr_symbol_where to see if this is an expression + symbol. */ + if (expr_symbol_where (fixp->fx_addsy, &sfile, &sline)) + as_bad_where (fixp->fx_file, fixp->fx_line, + "unresolved expression that must be resolved"); + else + as_bad_where (fixp->fx_file, fixp->fx_line, + "unsupported relocation type"); + fixp->fx_done = 1; + return 1; + } + } + else + { + /* We branch to here if the fixup is not to a symbol that + * appears in an instruction operand, but is rather some + * declared storage. + */ +#ifdef OBJ_ELF + i370_elf_validate_fix (fixp, seg); +#endif +#ifdef DEBUG + printf ("md_apply_fix3: reloc case %d in segment %s %s:%d\n", + fixp->fx_r_type, segment_name (seg), fixp->fx_file, fixp->fx_line); + printf ("\tcurrent fixup value is 0x%x \n", value); +#endif + switch (fixp->fx_r_type) + { + case BFD_RELOC_32: + case BFD_RELOC_CTOR: + if (fixp->fx_pcrel) + fixp->fx_r_type = BFD_RELOC_32_PCREL; + /* fall through */ + + case BFD_RELOC_RVA: + case BFD_RELOC_32_PCREL: + case BFD_RELOC_32_BASEREL: +#ifdef DEBUG + printf ("\t32 bit relocation at 0x%x\n", + fixp->fx_frag->fr_address + fixp->fx_where); +#endif + md_number_to_chars (fixp->fx_frag->fr_literal + fixp->fx_where, + value, 4); + break; + + case BFD_RELOC_LO16: + case BFD_RELOC_16: + if (fixp->fx_pcrel) + as_bad_where (fixp->fx_file, fixp->fx_line, + "cannot emit PC relative %s relocation%s%s", + bfd_get_reloc_code_name (fixp->fx_r_type), + fixp->fx_addsy != NULL ? " against " : "", + (fixp->fx_addsy != NULL + ? S_GET_NAME (fixp->fx_addsy) + : "")); + + md_number_to_chars (fixp->fx_frag->fr_literal + fixp->fx_where, + value, 2); + break; + + /* This case happens when you write, for example, + lis %r3,(L1-L2)@ha + where L1 and L2 are defined later. */ + case BFD_RELOC_HI16: + if (fixp->fx_pcrel) + abort (); + md_number_to_chars (fixp->fx_frag->fr_literal + fixp->fx_where, + value >> 16, 2); + break; + case BFD_RELOC_HI16_S: + if (fixp->fx_pcrel) + abort (); + md_number_to_chars (fixp->fx_frag->fr_literal + fixp->fx_where, + (value + 0x8000) >> 16, 2); + break; + + case BFD_RELOC_8: + if (fixp->fx_pcrel) + abort (); + + md_number_to_chars (fixp->fx_frag->fr_literal + fixp->fx_where, + value, 1); + break; + + default: + fprintf(stderr, + "Gas failure, reloc value %d\n", fixp->fx_r_type); + fflush(stderr); + abort (); + } + } + + fixp->fx_addnumber = value; + + return 1; +} + +/* Generate a reloc for a fixup. */ + +arelent * +tc_gen_reloc (seg, fixp) + asection *seg; + fixS *fixp; +{ + arelent *reloc; + + reloc = (arelent *) xmalloc (sizeof (arelent)); + + reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); + *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy); + reloc->address = fixp->fx_frag->fr_address + fixp->fx_where; + reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type); + if (reloc->howto == (reloc_howto_type *) NULL) + { + as_bad_where (fixp->fx_file, fixp->fx_line, + "reloc %d not supported by object file format", (int)fixp->fx_r_type); + return NULL; + } + reloc->addend = fixp->fx_addnumber; + +#ifdef DEBUG + printf ("\ngen_reloc(): sym %s (%s:%d) at addr 0x%x addend=0x%x\n", + fixp->fx_addsy->bsym->name, + fixp->fx_file, fixp->fx_line, + reloc->address, reloc->addend); +#endif + + return reloc; +} |