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/*
Copyright (C) 2007-2016 Arnaldo Carvalho de Melo <acme@kernel.org>
System call sign extender
This program is free software; you can redistribute it and/or modify it
under the terms of version 2 of the GNU General Public License as
published by the Free Software Foundation.
*/
#include <argp.h>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "dwarves.h"
#include "dutil.h"
static const char *prefix = "sys_";
static size_t prefix_len = 4;
static bool filter(struct function *f, struct cu *cu)
{
if (f->proto.nr_parms != 0) {
const char *name = function__name(f, cu);
if (strlen(name) > prefix_len &&
memcmp(name, prefix, prefix_len) == 0)
return false;
}
return true;
}
static void zero_extend(const int regparm, const struct base_type *bt,
struct cu *cu, const char *parm)
{
const char *instr = "INVALID";
switch (bt->bit_size) {
case 32:
instr = "sll";
break;
case 16:
instr = "slw";
break;
case 8:
instr = "slb";
break;
}
char bf[64];
printf("\t%s\t$a%d, $a%d, 0"
"\t/* zero extend $a%d(%s %s) from %d to 64-bit */\n",
instr, regparm, regparm, regparm,
base_type__name(bt, cu, bf, sizeof(bf)),
parm, bt->bit_size);
}
static void emit_wrapper(struct function *f, struct cu *cu)
{
struct parameter *parm;
const char *name = function__name(f, cu);
int regparm = 0, needs_wrapper = 0;
function__for_each_parameter(f, parm) {
const uint16_t type_id = parm->tag.type;
struct tag *type = cu__type(cu, type_id);
tag__assert_search_result(type);
if (type->tag == DW_TAG_base_type) {
struct base_type *bt = tag__base_type(type);
char bf[64];
if (bt->bit_size < 64 &&
strncmp(base_type__name(bt, cu, bf, sizeof(bf)),
"unsigned", 8) == 0) {
if (!needs_wrapper) {
printf("wrap_%s:\n", name);
needs_wrapper = 1;
}
zero_extend(regparm, bt, cu,
parameter__name(parm, cu));
}
}
++regparm;
}
if (needs_wrapper)
printf("\tj\t%s\n\n", name);
}
static int cu__emit_wrapper(struct cu *cu, void *cookie __unused)
{
struct function *pos;
uint32_t id;
cu__for_each_function(cu, id, pos)
if (!filter(pos, cu))
emit_wrapper(pos, cu);
return 0;
}
static void cus__emit_wrapper(struct cus *cu)
{
cus__for_each_cu(cu, cu__emit_wrapper, NULL, NULL);
}
/* Name and version of program. */
ARGP_PROGRAM_VERSION_HOOK_DEF = dwarves_print_version;
static const struct argp_option options[] = {
{
.key = 'p',
.name = "prefix",
.arg = "PREFIX",
.doc = "function prefix",
},
{
.name = NULL,
}
};
static error_t options_parser(int key, char *arg, struct argp_state *state)
{
switch (key) {
case ARGP_KEY_INIT:
if (state->child_inputs != NULL)
state->child_inputs[0] = state->input;
break;
case 'p':
prefix = arg;
prefix_len = strlen(prefix);
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
static const char args_doc[] = "FILE";
static struct argp argp = {
.options = options,
.parser = options_parser,
.args_doc = args_doc,
};
int main(int argc, char *argv[])
{
int err, remaining;
struct cus *cus = cus__new();
if (cus == NULL) {
fprintf(stderr, "%s: insufficient memory\n", argv[0]);
return EXIT_FAILURE;
}
if (argp_parse(&argp, argc, argv, 0, &remaining, NULL) ||
remaining == argc) {
argp_help(&argp, stderr, ARGP_HELP_SEE, argv[0]);
return EXIT_FAILURE;
}
err = cus__load_files(cus, NULL, argv + remaining);
if (err != 0) {
cus__fprintf_load_files_err(cus, "syscse", argv + remaining, err, stderr);
return EXIT_FAILURE;
}
cus__emit_wrapper(cus);
return EXIT_SUCCESS;
}
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