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nuttx/tools/mksyscall.c

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/****************************************************************************
* tools/mksyscall.c
*
* Copyright (C) 2011-2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "csvparser.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
static bool g_inline;
static FILE *g_stubstream;
/****************************************************************************
* Private Functions
****************************************************************************/
static bool is_vararg(const char *type, int ndx, int nparms)
{
if (strcmp(type,"...") == 0)
{
if (ndx != (nparms-1))
{
fprintf(stderr, "%d: ... is not the last in the argument list\n", g_lineno);
exit(11);
}
else if (nparms < 2)
{
fprintf(stderr, "%d: Need one parameter before ...\n", g_lineno);
exit(14);
}
return true;
}
return false;
}
static bool is_union(const char *type)
{
return (strncmp(type,"union", 5) == 0);
}
static const char *check_funcptr(const char *type)
{
const char *str = strstr(type,"(*)");
if (str)
{
return str + 2;
}
return NULL;
}
static const char *check_array(const char *type)
{
const char *str = strchr(type, '[');
if (str)
{
return str;
}
return NULL;
}
static void print_formalparm(FILE *stream, const char *argtype, int parmno)
{
const char *part2;
int len;
/* Function pointers and array formal parameter types are a little more work */
if ((part2 = check_funcptr(argtype)) != NULL ||
(part2 = check_array(argtype)) != NULL)
{
len = part2 - argtype;
fwrite(argtype, 1, len, stream);
fprintf(stream, "parm%d%s", parmno, part2);
}
else
{
fprintf(stream, "%s parm%d", argtype, parmno);
}
}
static void get_formalparmtype(const char *arg, char *formal)
{
/* The formal parm type is a pointer to everything up to the first'|' (or
* the end of the string if there is no '|' in the type description).
*/
while (*arg != '|' && *arg != '\0')
{
*formal++ = *arg++;
}
*formal = '\0';
}
static void get_actualparmtype(const char *arg, char *actual)
{
const char *pstart = strchr(arg,'|');
if (pstart)
{
/* The actual parameter type starts after the '|' */
pstart++;
}
else
{
/* The actual parameter is the same as the formal parameter
* at starts at the beginning of the type string.
*/
pstart = arg;
}
/* The actual parm type is a pointer to everything up to the next '|' (or
* the end of the string if there is no '|' in the type description).
*/
while (*pstart != '|' && *pstart != '\0')
{
*actual++ = *pstart++;
}
*actual = '\0';
}
static void get_fieldname(const char *arg, char *fieldname)
{
char *pactual = strchr(arg,'|');
char *pstart;
if (pactual)
{
/* The actual parameter type starts after the '|' */
pactual++;
pstart = strchr(pactual,'|');
if (pstart)
{
/* The fieldname is everything past the second '|' to the end of the string */
pstart++;
strncpy(fieldname, pstart, MAX_PARMSIZE);
return;
}
}
fprintf(stderr, "%d: Missing union fieldname: %s\n", g_lineno, arg);
exit(15);
}
static FILE *open_proxy(void)
{
char filename[MAX_PARMSIZE+10];
FILE *stream;
snprintf(filename, MAX_PARMSIZE+9, "PROXY_%s.c", g_parm[NAME_INDEX]);
filename[MAX_PARMSIZE+9] = '\0';
stream = fopen(filename, "w");
if (stream == NULL)
{
fprintf(stderr, "Failed to open %s: %s\n", filename, strerror(errno));
exit(10);
}
return stream;
}
static void generate_proxy(int nparms)
{
FILE *stream = open_proxy();
char formal[MAX_PARMSIZE];
char fieldname[MAX_PARMSIZE];
bool bvarargs = false;
int nformal;
int nactual;
int i;
/* Generate "up-front" information, include correct header files */
fprintf(stream, "/* Auto-generated %s proxy file -- do not edit */\n\n", g_parm[NAME_INDEX]);
fprintf(stream, "#include <nuttx/config.h>\n");
/* Suppress "'noreturn' function does return" warnings. */
fprintf(stream, "#include <nuttx/compiler.h>\n");
fprintf(stream, "#undef noreturn_function\n");
fprintf(stream, "#define noreturn_function\n");
/* Does this function have a variable number of parameters? If so then the
* final parameter type will be encoded as "..."
*/
if (is_vararg(g_parm[PARM1_INDEX+nparms-1], nparms-1, nparms))
{
nformal = nparms-1;
bvarargs = true;
fprintf(stream, "#include <stdarg.h>\n");
}
else
{
nformal = nparms;
}
if (g_parm[HEADER_INDEX] && strlen(g_parm[HEADER_INDEX]) > 0)
{
fprintf(stream, "#include <%s>\n", g_parm[HEADER_INDEX]);
}
fprintf(stream, "#include <syscall.h>\n\n");
if (g_parm[COND_INDEX][0] != '\0')
{
fprintf(stream, "#if %s\n\n", g_parm[COND_INDEX]);
}
/* Generate the function definition that matches standard function prototype */
fprintf(stream, "%s %s(", g_parm[RETTYPE_INDEX], g_parm[NAME_INDEX]);
/* Generate the formal parameter list */
if (nformal <= 0)
{
fprintf(stream, "void");
}
else
{
for (i = 0; i < nformal; i++)
{
/* The formal and actual parameter types may be encoded.. extra the
* formal parameter type.
*/
get_formalparmtype(g_parm[PARM1_INDEX+i], formal);
/* Arguments after the first must be separated from the preceding
* parameter with a comma.
*/
if (i > 0)
{
fprintf(stream, ", ");
}
print_formalparm(stream, formal, i+1);
}
}
/* Handle the end of the formal parameter list */
if (bvarargs)
{
fprintf(stream, ", ...)\n{\n");
/* Get parm variables .. some from the parameter list and others from
* the varargs.
*/
if (nparms < 7)
{
fprintf(stream, " va_list ap;\n");
for (i = nparms; i < 7; i++)
{
fprintf(stream, " uintptr_t parm%d;\n", i);
}
fprintf(stream, "\n va_start(ap, parm%d);\n", nparms-1);
for (i = nparms; i < 7; i++)
{
fprintf(stream, " parm%d = va_arg(ap, uintptr_t);\n", i);
}
fprintf(stream, " va_end(ap);\n\n");
}
}
else
{
fprintf(stream, ")\n{\n");
}
/* Generate the system call. Functions that do not return or return void
* are special cases.
*/
nactual = bvarargs ? 6 : nparms;
if (strcmp(g_parm[RETTYPE_INDEX], "void") == 0)
{
fprintf(stream, " (void)sys_call%d(", nactual);
}
else
{
fprintf(stream, " return (%s)sys_call%d(", g_parm[RETTYPE_INDEX], nactual);
}
/* Create the parameter list with the matching types. The first parameter
* is always the syscall number.
*/
fprintf(stream, "(unsigned int)SYS_%s", g_parm[NAME_INDEX]);
for (i = 0; i < nactual; i++)
{
/* Is the parameter a union member */
if (i < nparms && is_union(g_parm[PARM1_INDEX+i]))
{
/* Then we will have to pick a field name that can be cast to a
* uintptr_t. There probably should be some error handling here
* to catch the case where the fieldname was not supplied.
*/
get_fieldname(g_parm[PARM1_INDEX+i], fieldname);
fprintf(stream, ", (uintptr_t)parm%d.%s", i+1, fieldname);
}
else
{
fprintf(stream, ", (uintptr_t)parm%d", i+1);
}
}
/* Handle the tail end of the function. */
fprintf(stream, ");\n}\n\n");
if (g_parm[COND_INDEX][0] != '\0')
{
fprintf(stream, "#endif /* %s */\n", g_parm[COND_INDEX]);
}
fclose(stream);
}
static FILE *open_stub(void)
{
if (g_inline)
{
if (!g_stubstream)
{
g_stubstream = fopen("STUB.h", "w");
if (g_stubstream == NULL)
{
fprintf(stderr, "Failed to open STUB.h: %s\n", strerror(errno));
exit(9);
}
fprintf(g_stubstream, "/* Autogenerated STUB header file */\n\n");
fprintf(g_stubstream, "#ifndef __STUB_H\n");
fprintf(g_stubstream, "#define __STUB_H\n\n");
}
return g_stubstream;
}
else
{
char filename[MAX_PARMSIZE+8];
FILE *stream;
snprintf(filename, MAX_PARMSIZE+7, "STUB_%s.c", g_parm[NAME_INDEX]);
filename[MAX_PARMSIZE+7] = '\0';
stream = fopen(filename, "w");
if (stream == NULL)
{
fprintf(stderr, "Failed to open %s: %s\n", filename, strerror(errno));
exit(9);
}
return stream;
}
}
static void stub_close(FILE *stream)
{
if (!g_inline)
{
fclose(stream);
}
}
static void generate_stub(int nparms)
{
FILE *stream = open_stub();
char formal[MAX_PARMSIZE];
char actual[MAX_PARMSIZE];
int i;
int j;
/* Generate "up-front" information, include correct header files */
fprintf(stream, "/* Auto-generated %s stub file -- do not edit */\n\n", g_parm[0]);
fprintf(stream, "#include <nuttx/config.h>\n");
fprintf(stream, "#include <stdint.h>\n");
if (g_parm[HEADER_INDEX] && strlen(g_parm[HEADER_INDEX]) > 0)
{
fprintf(stream, "#include <%s>\n", g_parm[HEADER_INDEX]);
}
putc('\n', stream);
if (g_parm[COND_INDEX][0] != '\0')
{
fprintf(stream, "#if %s\n\n", g_parm[COND_INDEX]);
}
/* Generate the function definition that matches standard function prototype */
if (g_inline)
{
fprintf(stream, "static inline ");
}
fprintf(stream, "uintptr_t STUB_%s(int nbr", g_parm[NAME_INDEX]);
/* Generate the formal parameter list */
for (i = 0; i < nparms; i++)
{
/* Check for a variable number of arguments */
if (is_vararg(g_parm[PARM1_INDEX+i], i, nparms))
{
/* Always receive six arguments in this case */
for (j = i+1; j <= 6; j++)
{
fprintf(stream, ", uintptr_t parm%d", j);
}
}
else
{
fprintf(stream, ", uintptr_t parm%d", i+1);
}
}
fprintf(stream, ")\n{\n");
/* Then call the proxied function. Functions that have no return value are
* a special case.
*/
if (strcmp(g_parm[RETTYPE_INDEX], "void") == 0)
{
fprintf(stream, " %s(", g_parm[NAME_INDEX]);
}
else
{
fprintf(stream, " return (uintptr_t)%s(", g_parm[NAME_INDEX]);
}
/* The pass all of the system call parameters, casting to the correct type
* as necessary.
*/
for (i = 0; i < nparms; i++)
{
/* Get the formal type of the parameter, and get the type that we
* actually have to cast to. For example for a formal type like 'int parm[]'
* we have to cast the actual parameter to 'int*'. The worst is a union
* type like 'union sigval' where we have to cast to (union sigval)((FAR void *)parm)
* -- Yech.
*/
get_formalparmtype(g_parm[PARM1_INDEX+i], formal);
get_actualparmtype(g_parm[PARM1_INDEX+i], actual);
/* Treat the first argument in the list differently from the others..
* It does not need a comma before it.
*/
if (i > 0)
{
/* Check for a variable number of arguments */
if (is_vararg(actual, i, nparms))
{
/* Always pass six arguments */
for (j = i+1; j <= 6; j++)
{
fprintf(stream, ", parm%d", j);
}
}
else
{
if (is_union(formal))
{
fprintf(stream, ", (%s)((%s)parm%d)", formal, actual, i+1);
}
else
{
fprintf(stream, ", (%s)parm%d", actual, i+1);
}
}
}
else
{
if (is_union(formal))
{
fprintf(stream, "(%s)((%s)parm%d)", formal, actual, i+1);
}
else
{
fprintf(stream, "(%s)parm%d",actual, i+1);
}
}
}
/* Tail end of the function. If the proxied function has no return
* value, just return zero (OK).
*/
if (strcmp(g_parm[RETTYPE_INDEX], "void") == 0)
{
fprintf(stream, ");\n return 0;\n}\n\n");
}
else
{
fprintf(stream, ");\n}\n\n");
}
if (g_parm[COND_INDEX][0] != '\0')
{
fprintf(stream, "#endif /* %s */\n", g_parm[COND_INDEX]);
}
stub_close(stream);
}
static void show_usage(const char *progname)
{
fprintf(stderr, "USAGE: %s [-p|s|i] <CSV file>\n\n", progname);
fprintf(stderr, "Where:\n\n");
fprintf(stderr, "\t-p : Generate proxies\n");
fprintf(stderr, "\t-s : Generate stubs\n");
fprintf(stderr, "\t-i : Generate proxies as static inline functions\n");
fprintf(stderr, "\t-d : Enable debug output\n");
exit(1);
}
/****************************************************************************
* Public Functions
****************************************************************************/
int main(int argc, char **argv, char **envp)
{
char *csvpath;
bool proxies = false;
FILE *stream;
char *ptr;
int ch;
/* Parse command line options */
g_debug = false;
g_inline = false;
while ((ch = getopt(argc, argv, ":dps")) > 0)
{
switch (ch)
{
case 'd' :
g_debug = true;
break;
case 'p' :
proxies = true;
break;
case 's' :
proxies = false;
break;
case 'i' :
g_inline = true;
break;
case '?' :
fprintf(stderr, "Unrecognized option: %c\n", optopt);
show_usage(argv[0]);
case ':' :
fprintf(stderr, "Missing option argument, option: %c\n", optopt);
show_usage(argv[0]);
default:
fprintf(stderr, "Unexpected option: %c\n", ch);
show_usage(argv[0]);
}
}
if (optind >= argc)
{
fprintf(stderr, "Missing <CSV file>\n");
show_usage(argv[0]);
}
csvpath = argv[optind];
if (++optind < argc)
{
fprintf(stderr, "Unexpected garbage at the end of the line\n");
show_usage(argv[0]);
}
/* Open the CSV file */
stream= fopen(csvpath, "r");
if (!stream)
{
fprintf(stderr, "open %s failed: %s\n", csvpath, strerror(errno));
exit(3);
}
/* Process each line in the CVS file */
while ((ptr = read_line(stream)) != NULL)
{
/* Parse the line from the CVS file */
int nargs = parse_csvline(ptr);
if (nargs < PARM1_INDEX)
{
fprintf(stderr, "Only %d arguments found: %s\n", nargs, g_line);
exit(8);
}
if (proxies)
{
generate_proxy(nargs - PARM1_INDEX);
}
else
{
g_stubstream = NULL;
generate_stub(nargs - PARM1_INDEX);
if (g_stubstream != NULL)
{
fprintf(g_stubstream, "\n#endif /* __STUB_H */\n");
fclose(g_stubstream);
}
}
}
/* Close the CSV file */
fclose(stream);
return 0;
}
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