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incubator-nuttx/tools/mksyscall.c

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/****************************************************************************
* tools/mksyscall.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "csvparser.h"
/****************************************************************************
* Private Data
****************************************************************************/
static bool g_inline;
static FILE *g_stubstream;
/****************************************************************************
* Private Functions
****************************************************************************/
static bool is_vararg(const char *type)
{
return strcmp(type, "...") == 0;
}
static bool is_union(const char *type)
{
return strncmp(type, "union ", 6) == 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 - 1);
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 nfixed, int nparms)
{
FILE *stream = open_proxy();
char formal[MAX_PARMSIZE];
char actual[MAX_PARMSIZE];
char fieldname[MAX_PARMSIZE];
int i = 0;
/* 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");
/* Does this function have a variable number of parameters? If so then the
* final parameter type will be encoded as "..."
*/
if (nfixed != nparms)
{
fprintf(stream, "#include <stdarg.h>\n");
}
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
*/
if (strcmp(g_parm[RETTYPE_INDEX], "noreturn") == 0)
{
fprintf(stream, "void ");
}
else
{
fprintf(stream, "%s ", g_parm[RETTYPE_INDEX]);
}
fprintf(stream, "%s(", g_parm[NAME_INDEX]);
/* Generate the formal parameter list */
if (nparms <= 0)
{
fprintf(stream, "void");
}
else
{
for (i = 0; i < nfixed; 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 (i < nparms)
{
fprintf(stream, ", ...)\n{\n");
/* Get parm variables .. some from the parameter list and others from
* the varargs.
*/
fprintf(stream, " va_list ap;\n");
for (; i < nparms; i++)
{
get_formalparmtype(g_parm[PARM1_INDEX + i], formal);
fprintf(stream, " %s parm%d;\n", formal, i + 1);
}
fprintf(stream, "\n va_start(ap, parm%d);\n", nfixed);
for (i = nfixed; i < nparms; i++)
{
get_formalparmtype(g_parm[PARM1_INDEX + i], formal);
get_actualparmtype(g_parm[PARM1_INDEX + i], actual);
if (is_union(formal))
{
fprintf(stream, " parm%d = (%s)va_arg(ap, %s);\n",
i + 1, formal, actual);
}
else
{
fprintf(stream, " parm%d = va_arg(ap, %s);\n", i + 1, actual);
}
}
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.
*/
if (strcmp(g_parm[RETTYPE_INDEX], "void") == 0 ||
strcmp(g_parm[RETTYPE_INDEX], "noreturn") == 0)
{
fprintf(stream, " (void)sys_call%d(", nparms);
}
else
{
fprintf(stream, " return (%s)sys_call%d(", g_parm[RETTYPE_INDEX],
nparms);
}
/* 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 < nparms; i++)
{
/* Is the parameter a union member */
if (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");
if (strcmp(g_parm[RETTYPE_INDEX], "noreturn") == 0)
{
fprintf(stream, " while(1);\n");
}
fprintf(stream, "}\n");
if (g_parm[COND_INDEX][0] != '\0')
{
fprintf(stream, "\n#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 nfixed, int nparms)
{
FILE *stream = open_stub();
char formal[MAX_PARMSIZE];
char actual[MAX_PARMSIZE];
int i;
/* 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++)
{
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 ||
strcmp(g_parm[RETTYPE_INDEX], "noreturn") == 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)
{
fprintf(stream, ", ");
}
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 stubs function has no return
* value, just return zero (OK).
*/
if (strcmp(g_parm[RETTYPE_INDEX], "void") == 0)
{
fprintf(stream, ");\n return 0;\n}\n");
}
else
{
fprintf(stream, ");\n}\n");
}
if (g_parm[COND_INDEX][0] != '\0')
{
fprintf(stream, "\n#endif /* %s */\n", g_parm[COND_INDEX]);
}
stub_close(stream);
}
static FILE *open_wrapper(void)
{
char filename[MAX_PARMSIZE + 8];
FILE *stream;
snprintf(filename, MAX_PARMSIZE + 7, "WRAP_%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(10);
}
return stream;
}
static void generate_wrapper(int nfixed, int nparms)
{
FILE *stream = open_wrapper();
char formal[MAX_PARMSIZE];
char actual[MAX_PARMSIZE];
char fieldname[MAX_PARMSIZE];
int i = 0;
/* Generate "up-front" information, include correct header files */
fprintf(stream, "/* Auto-generated %s wrap file -- do not edit */\n\n",
g_parm[NAME_INDEX]);
fprintf(stream, "#include <nuttx/config.h>\n");
fprintf(stream, "#include <nuttx/sched_note.h>\n");
fprintf(stream, "#include <stdint.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");
/* CONFIG_LIB_SYSCALL must be defined to get syscall number */
fprintf(stream, "#undef CONFIG_LIB_SYSCALL\n");
fprintf(stream, "#define CONFIG_LIB_SYSCALL\n");
fprintf(stream, "#include <syscall.h>\n");
/* Does this function have a variable number of parameters? If so then the
* final parameter type will be encoded as "..."
*/
if (nfixed != nparms)
{
fprintf(stream, "#include <stdarg.h>\n");
}
if (g_parm[HEADER_INDEX] && strlen(g_parm[HEADER_INDEX]) > 0)
{
fprintf(stream, "#include <%s>\n", g_parm[HEADER_INDEX]);
}
/* Define macros to get wrapper symbol */
fprintf(stream, "#include <nuttx/arch.h>\n");
fprintf(stream, "#ifndef UP_WRAPSYM\n");
fprintf(stream, "#define UP_WRAPSYM(s) __wrap_##s\n");
fprintf(stream, "#endif\n");
fprintf(stream, "#ifndef UP_REALSYM\n");
fprintf(stream, "#define UP_REALSYM(s) __real_##s\n");
fprintf(stream, "#endif\n\n");
if (g_parm[COND_INDEX][0] != '\0')
{
fprintf(stream, "#if %s\n\n", g_parm[COND_INDEX]);
}
/* Generate the wrapper function definition that matches standard function
* prototype
*/
fprintf(stream, "%s UP_WRAPSYM(%s)(", g_parm[RETTYPE_INDEX],
g_parm[NAME_INDEX]);
/* Generate the formal parameter list */
if (nparms <= 0)
{
fprintf(stream, "void");
}
else
{
for (i = 0; i < nfixed; 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);
}
}
if (i < nparms)
{
fprintf(stream, ", ...)\n{\n");
}
else
{
fprintf(stream, ")\n{\n");
}
/* Generate the result variable definition for non-void function */
if (strcmp(g_parm[RETTYPE_INDEX], "void") != 0)
{
fprintf(stream, " %s result;\n", g_parm[RETTYPE_INDEX]);
}
/* Generate the wrapped (real) function prototype definition */
fprintf(stream, " %s UP_REALSYM(%s)(", g_parm[RETTYPE_INDEX],
g_parm[NAME_INDEX]);
/* Generate the formal parameter list */
if (nparms <= 0)
{
fprintf(stream, "void");
}
else
{
for (i = 0; i < nfixed; 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, ", ");
}
fprintf(stream, "%s", formal);
}
}
/* Handle the end of the formal parameter list */
if (i < nparms)
{
fprintf(stream, ", ...);\n");
/* Get parm variables .. some from the parameter list and others from
* the varargs.
*/
fprintf(stream, " va_list ap;\n");
for (; i < nparms; i++)
{
get_formalparmtype(g_parm[PARM1_INDEX + i], formal);
fprintf(stream, " %s parm%d;\n", formal, i + 1);
}
fprintf(stream, "\n va_start(ap, parm%d);\n", nfixed);
for (i = nfixed; i < nparms; i++)
{
get_formalparmtype(g_parm[PARM1_INDEX + i], formal);
get_actualparmtype(g_parm[PARM1_INDEX + i], actual);
if (is_union(formal))
{
fprintf(stream, " parm%d = (%s)va_arg(ap, %s);\n",
i + 1, formal, actual);
}
else
{
fprintf(stream, " parm%d = va_arg(ap, %s);\n", i + 1, actual);
}
}
fprintf(stream, " va_end(ap);\n");
}
else
{
fprintf(stream, ");\n");
}
/* Call system call enter hook function */
fprintf(stream, "\n sched_note_syscall_enter(SYS_%s, %d",
g_parm[NAME_INDEX], nparms);
for (i = 0; i < nparms; i++)
{
/* Is the parameter a union member */
if (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);
}
}
fprintf(stream, ");\n\n");
/* Then call the wrapped (real) function. Functions that have no return
* value are a special case.
*/
if (strcmp(g_parm[RETTYPE_INDEX], "void") == 0)
{
fprintf(stream, " UP_REALSYM(%s)(", g_parm[NAME_INDEX]);
}
else
{
fprintf(stream, " result = UP_REALSYM(%s)(", g_parm[NAME_INDEX]);
}
/* The pass all of the system call parameters */
for (i = 0; i < nparms; i++)
{
/* Treat the first argument in the list differently from the others..
* It does not need a comma before it.
*/
if (i > 0)
{
fprintf(stream, ", ");
}
fprintf(stream, "parm%d", i + 1);
}
fprintf(stream, ");\n\n");
/* Call system call leave hook function */
fprintf(stream, " sched_note_syscall_leave(SYS_%s, ", g_parm[NAME_INDEX]);
if (strcmp(g_parm[RETTYPE_INDEX], "void") == 0)
{
fprintf(stream, "0");
}
else
{
fprintf(stream, "(uintptr_t)result");
}
fprintf(stream, ");\n\n");
/* Tail end of the function. If the wrapped (real) function has no return
* value, do nothing.
*/
if (strcmp(g_parm[RETTYPE_INDEX], "void") == 0)
{
fprintf(stream, "}\n");
}
else
{
fprintf(stream, " return result;\n}\n");
}
if (g_parm[COND_INDEX][0] != '\0')
{
fprintf(stream, "\n#endif /* %s */\n", g_parm[COND_INDEX]);
}
fclose(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-w : Generate wrappers\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;
bool wrappers = false;
FILE *stream;
char *ptr;
int ch;
int i;
/* Parse command line options */
g_debug = false;
g_inline = false;
while ((ch = getopt(argc, argv, ":dpsw")) > 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 'w' :
wrappers = 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)
{
int nfixed;
/* 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);
}
/* Assume no variable arguments by default */
nfixed = nargs - PARM1_INDEX;
/* Search for an occurrence of "...". This is followed by the list
* types in the variable arguments. The number of types is the
* maximum number of variable arguments.
*/
for (i = PARM1_INDEX; i < nargs; i++)
{
if (is_vararg(g_parm[i]))
{
/* "..." is the last argument? */
if (i == --nargs)
{
/* Yes, generate the default variable arguments */
while (nargs < PARM1_INDEX + 6)
{
strcpy(g_parm[nargs++], "uintptr_t");
}
}
else
{
/* Move up one slot to overwrite "..." */
memmove(g_parm[i], g_parm[i + 1],
sizeof(g_parm[i]) * (nargs - i));
}
nfixed = i - PARM1_INDEX;
break;
}
}
if (proxies)
{
generate_proxy(nfixed, nargs - PARM1_INDEX);
}
else if (wrappers)
{
generate_wrapper(nfixed, nargs - PARM1_INDEX);
}
else
{
g_stubstream = NULL;
generate_stub(nfixed, 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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