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fis-gtm/sr_x86_64/obj_filesp.c

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/****************************************************************
* *
* Copyright 2007, 2010 Fidelity Information Services, Inc *
* *
* This source code contains the intellectual property *
* of its copyright holder(s), and is made available *
* under a license. If you do not know the terms of *
* the license, please stop and do not read further. *
* *
****************************************************************/
/*
* The native object (ELF) wrapper has the following format:
*
* +-------------------------------+
* | ELF header |
* +-------------------------------+
* | .text section (GTM object) |
* +-------------------------------+
* | .strtab section(string table) |
* +-------------------------------+
* | .symtab section(sym table) |
* +-------------------------------+
* | ELF Section header table |
* +-------------------------------+
*
* The GT.M object layout (in the .text section) is described in obj_code.c
*
*/
#include "mdef.h"
#include "gtm_string.h"
#include <errno.h>
#include <libelf.h>
#include "gtm_fcntl.h"
#include "gtm_unistd.h"
#include "gtm_stdio.h"
#include "compiler.h"
#include "rtnhdr.h"
#include "obj_gen.h"
#include "cgp.h"
#include "mdq.h"
#include "cmd_qlf.h"
#include "objlabel.h" /* needed for masscomp.h */
#include "stringpool.h"
#include "parse_file.h"
#include "gtmio.h"
#include "mmemory.h"
#include "obj_file.h"
#include "obj_filesp.h"
#include "release_name.h"
#include "min_max.h"
/* The following definitions are reqquired for the new(for ELF files) create/close_obj_file.c functions */
#ifdef __linux__
#define ELF64_LINKER_FLAG 0x10
#else
#define ELF64_LINKER_FLAG 0x18
#endif /* __linux__ */
/* Platform specific action instructions when routine called from foreign language */
/* Currently just a return to caller on AIX */
#define MIN_LINK_PSECT_SIZE 0
LITDEF mach_inst jsb_action[JSB_ACTION_N_INS] = {0x48, 0xc7, 0xc0, 0xff, 0xff, 0xff, 0xff, 0xc3};
GBLREF command_qualifier cmd_qlf;
GBLREF char object_file_name[];
GBLREF int object_file_des;
GBLREF short object_name_len;
GBLREF mident module_name;
GBLREF boolean_t run_time;
GBLREF int4 gtm_object_size;
DEBUG_ONLY(GBLREF int obj_bytes_written;)
#define GTM_LANG "MUMPS"
static char static_string_tbl[] = {
/* Offset 0 */ '\0',
/* Offset 1 */ '.', 't', 'e', 'x', 't', '\0',
/* Offset 7 */ '.', 's', 't', 'r', 't', 'a', 'b', '\0',
/* Offset 15 */ '.', 's', 'y', 'm', 't', 'a', 'b', '\0'
};
#define SPACE_STRING_ALLOC_LEN (SIZEOF(static_string_tbl) + \
SIZEOF(GTM_LANG) + 1 + \
SIZEOF(GTM_PRODUCT) + 1 + \
SIZEOF(GTM_RELEASE_NAME) + 1 + \
SIZEOF(mident_fixed))
/* Following constants has to be in sync with above static string array(static_string_tbl) */
#define STR_SEC_TEXT_OFFSET 1
#define STR_SEC_STRTAB_OFFSET 7
#define STR_SEC_SYMTAB_OFFSET 15
#define SEC_TEXT_INDX 1
#define SEC_STRTAB_INDX 2
#define SEC_SYMTAB_INDX 3
LITREF char gtm_release_name[];
LITREF int4 gtm_release_name_len;
GBLREF mliteral literal_chain;
GBLREF char source_file_name[];
GBLREF unsigned short source_name_len;
GBLREF mident routine_name;
GBLREF mident module_name;
GBLREF int4 mlmax, mvmax;
GBLREF int4 code_size, lit_addrs, lits_size;
GBLREF int4 psect_use_tab[]; /* bytes of each psect in this module */
error_def(ERR_OBJFILERR);
/* Open the object file and write out the gtm object. Actual ELF creation happens at later stage during close_object_file */
void create_object_file(rhdtyp *rhead)
{
int status, rout_len;
char obj_name[SIZEOF(mident_fixed) + 5];
mstr fstr;
parse_blk pblk;
error_def(ERR_FILEPARSE);
assert(!run_time);
DEBUG_ONLY(obj_bytes_written = 0);
memset(&pblk, 0, SIZEOF(pblk));
pblk.buffer = object_file_name;
pblk.buff_size = MAX_FBUFF;
/* create the object file */
fstr.len = (MV_DEFINED(&cmd_qlf.object_file) ? cmd_qlf.object_file.str.len : 0);
fstr.addr = cmd_qlf.object_file.str.addr;
rout_len = (int)module_name.len;
memcpy(&obj_name[0], module_name.addr, rout_len);
memcpy(&obj_name[rout_len], DOTOBJ, SIZEOF(DOTOBJ)); /* includes null terminator */
pblk.def1_size = rout_len + SIZEOF(DOTOBJ) - 1; /* Length does not include null terminator */
pblk.def1_buf = obj_name;
status = parse_file(&fstr, &pblk);
if (0 == (status & 1))
rts_error(VARLSTCNT(5) ERR_FILEPARSE, 2, fstr.len, fstr.addr, status);
object_name_len = pblk.b_esl;
object_file_name[object_name_len] = 0;
OPEN_OBJECT_FILE(object_file_name, O_CREAT | O_RDWR, object_file_des);
if (FD_INVALID == object_file_des)
rts_error(VARLSTCNT(5) ERR_OBJFILERR, 2, object_name_len, object_file_name, errno);
/* Action instructions and marker are not kept in the same array since the type of the elements of
* the former (uint4) may be different from the type of the elements of the latter (char).
* 'tiz cleaner this way rather than converting one to the other type in order to be accommodated
* in an array
* */
assert(JSB_ACTION_N_INS * SIZEOF(jsb_action[0]) == SIZEOF(jsb_action)); /* JSB_ACTION_N_INS maintained? */
assert(SIZEOF(jsb_action) <= SIZEOF(rhead->jsb)); /* overflow check */
memcpy(rhead->jsb, (char *)jsb_action, SIZEOF(jsb_action)); /* action instructions */
memcpy(&rhead->jsb[SIZEOF(jsb_action)], JSB_MARKER, /* followed by GTM_CODE marker */
MIN(STR_LIT_LEN(JSB_MARKER), SIZEOF(rhead->jsb) - SIZEOF(jsb_action)));
emit_immed((char *)rhead, SIZEOF(*rhead));
}
/* At this point, we know only gtm_object has been written onto the file.
* Read that gtm_object and wrap it up in .text section, add remaining sections to native object(ELF)
* Update the ELF, write it out to the object file and close the object file */
void close_object_file(void)
{
int i, status;
size_t bufSize;
ssize_t actualSize;
char *gtm_obj_code, *string_tbl;
int symIndex, strEntrySize;
Elf *elf;
Elf64_Ehdr *ehdr;
Elf64_Shdr *shdr, *text_shdr, *symtab_shdr, *strtab_shdr;
Elf_Scn *text_scn, *symtab_scn, *strtab_scn;
Elf_Data *text_data, *symtab_data, *strtab_data;
Elf64_Sym symEntries[3];
buff_flush();
bufSize = gtm_object_size;
actualSize = 0;
string_tbl = malloc(SPACE_STRING_ALLOC_LEN);
symIndex = 0;
strEntrySize = SIZEOF(static_string_tbl);
memcpy((string_tbl + symIndex), static_string_tbl, strEntrySize);
symIndex += strEntrySize;
strEntrySize = SIZEOF(GTM_LANG);
memcpy((string_tbl + symIndex), GTM_LANG, strEntrySize);
symIndex += strEntrySize;
strEntrySize = SIZEOF(GTM_PRODUCT);
memcpy((string_tbl + symIndex), GTM_PRODUCT, strEntrySize);
symIndex += strEntrySize;
strEntrySize = SIZEOF(GTM_RELEASE_NAME);
memcpy((string_tbl + symIndex), GTM_RELEASE_NAME, strEntrySize);
symIndex += strEntrySize;
gtm_obj_code = (char *)malloc(bufSize);
/* At this point, we have only the GTM object written onto the file.
* We need to read it back and wrap inside the ELF object and
* write a native ELF object file. */
lseek(object_file_des, 0, SEEK_SET);
DOREADRL(object_file_des, gtm_obj_code, bufSize, actualSize);
/* Reset the pointer back for writing an ELF object. */
lseek(object_file_des, 0, SEEK_SET);
/* Generate ELF64 header */
if (elf_version(EV_CURRENT) == EV_NONE )
{
FPRINTF(stderr, "Elf library out of date!n");
GTMASSERT;
}
if ((elf = elf_begin(object_file_des, ELF_C_WRITE, NULL)) == 0)
{
FPRINTF(stderr, "elf_begin failed!\n");
GTMASSERT;
}
if ( (ehdr = elf64_newehdr(elf)) == NULL )
{
FPRINTF(stderr, "elf64_newehdr() failed!\n");
GTMASSERT;
}
ehdr->e_ident[EI_MAG0] = ELFMAG0;
ehdr->e_ident[EI_MAG1] = ELFMAG1;
ehdr->e_ident[EI_MAG2] = ELFMAG2;
ehdr->e_ident[EI_MAG3] = ELFMAG3;
ehdr->e_ident[EI_CLASS] = ELFCLASS64;
ehdr->e_ident[EI_VERSION] = EV_CURRENT;
#ifdef __hpux
ehdr->e_ident[EI_DATA] = ELFDATA2MSB;
ehdr->e_ident[EI_OSABI] = ELFOSABI_HPUX;
#else
ehdr->e_ident[EI_DATA] = ELFDATA2LSB;
ehdr->e_ident[EI_OSABI] = ELFOSABI_LINUX;
#endif /* __hpux */
ehdr->e_ident[EI_ABIVERSION] = EV_CURRENT;
ehdr->e_machine = EM_X86_64;
ehdr->e_type = ET_REL;
ehdr->e_version = EV_CURRENT;
ehdr->e_shoff = SIZEOF(Elf64_Ehdr);
ehdr->e_flags = ELF64_LINKER_FLAG;
if ((text_scn = elf_newscn(elf)) == NULL)
{
FPRINTF(stderr, "elf_newscn() failed for text section!\n");
GTMASSERT;
}
if ((text_data = elf_newdata(text_scn)) == NULL)
{
FPRINTF(stderr, "elf_newdata() failed for text section!\n");
GTMASSERT;
}
text_data->d_align = SECTION_ALIGN_BOUNDARY;
text_data->d_off = 0LL;
text_data->d_buf = gtm_obj_code;
text_data->d_type = ELF_T_REL;
text_data->d_size = gtm_object_size;
text_data->d_version = EV_CURRENT;
if ((text_shdr = elf64_getshdr(text_scn)) == NULL)
{
FPRINTF(stderr, "elf64_getshdr() failed for text section\n");
GTMASSERT;
}
text_shdr->sh_name = STR_SEC_TEXT_OFFSET;
text_shdr->sh_type = SHT_PROGBITS;
text_shdr->sh_flags = SHF_ALLOC | SHF_EXECINSTR;
text_shdr->sh_entsize = gtm_object_size;
memcpy((string_tbl + symIndex), module_name.addr, module_name.len);
string_tbl[symIndex + module_name.len] = '\0';
if ((strtab_scn = elf_newscn(elf)) == NULL)
{
FPRINTF(stderr, "elf_newscn() failed for strtab section\n");
GTMASSERT;
}
if ((strtab_data = elf_newdata(strtab_scn)) == NULL)
{
FPRINTF(stderr, "elf_newdata() failed for strtab section!\n");
GTMASSERT;
}
strtab_data->d_align = NATIVE_WSIZE;
strtab_data->d_buf = string_tbl;
strtab_data->d_off = 0LL;
strtab_data->d_size = SPACE_STRING_ALLOC_LEN;
strtab_data->d_type = ELF_T_BYTE;
strtab_data->d_version = EV_CURRENT;
if ((strtab_shdr = elf64_getshdr(strtab_scn)) == NULL)
{
FPRINTF(stderr, "elf_getshdr() failed for strtab section!\n");
GTMASSERT;
}
strtab_shdr->sh_name = STR_SEC_STRTAB_OFFSET;
strtab_shdr->sh_type = SHT_STRTAB;
strtab_shdr->sh_entsize = 0;
ehdr->e_shstrndx = elf_ndxscn(strtab_scn);
/* Creating .symbtab section */
i = 0;
/* NULL symbol */
symEntries[i].st_name = 0;
symEntries[i].st_info = ELF64_ST_INFO(STB_LOCAL, STT_NOTYPE);
symEntries[i].st_other = STV_DEFAULT;
symEntries[i].st_shndx = 0;
symEntries[i].st_size = 0;
symEntries[i].st_value = 0;
i++;
/* Module symbol */
symEntries[i].st_name = symIndex;
symEntries[i].st_info = ELF64_ST_INFO(STB_GLOBAL, STT_FUNC);
symEntries[i].st_other = STV_DEFAULT;
symEntries[i].st_shndx = SEC_TEXT_INDX;
symEntries[i].st_size = gtm_object_size;
symEntries[i].st_value = 0;
i++;
/* symbol for .text section */
symEntries[i].st_name = STR_SEC_TEXT_OFFSET;
symEntries[i].st_info = ELF64_ST_INFO(STB_LOCAL, STT_SECTION);
symEntries[i].st_other = STV_DEFAULT;
symEntries[i].st_shndx = SEC_TEXT_INDX; /* index of the .text */
symEntries[i].st_size = 0;
symEntries[i].st_value = 0;
i++;
if ((symtab_scn = elf_newscn(elf)) == NULL)
{
FPRINTF(stderr, "elf_newscn() failed for symtab section!\n");
GTMASSERT;
}
if ((symtab_data = elf_newdata(symtab_scn)) == NULL)
{
FPRINTF(stderr, "elf_newdata() failed for symtab section!\n");
GTMASSERT;
}
symtab_data->d_align = NATIVE_WSIZE;
symtab_data->d_off = 0LL;
symtab_data->d_buf = symEntries;
symtab_data->d_type = ELF_T_REL;
symtab_data->d_size = SIZEOF(Elf64_Sym) * i;
symtab_data->d_version = EV_CURRENT;
if ((symtab_shdr = elf64_getshdr(symtab_scn)) == NULL)
{
FPRINTF(stderr, "elf_getshdr() failed for symtab section!\n");
GTMASSERT;
}
symtab_shdr->sh_name = STR_SEC_SYMTAB_OFFSET;
symtab_shdr->sh_type = SHT_SYMTAB;
symtab_shdr->sh_entsize = SIZEOF(Elf64_Sym) ;
symtab_shdr->sh_link = SEC_STRTAB_INDX;
elf_flagehdr(elf, ELF_C_SET, ELF_F_DIRTY);
if (elf_update(elf, ELF_C_WRITE) < 0)
{
FPRINTF(stderr, "elf_update() failed!\n");
GTMASSERT;
}
elf_end(elf);
/* Free the memory malloc'ed above */
free(string_tbl);
free(gtm_obj_code);
if ((off_t)-1 == lseek(object_file_des, (off_t)0, SEEK_SET))
rts_error(VARLSTCNT(5) ERR_OBJFILERR, 2, object_name_len, object_file_name, errno);
}
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