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// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
/* Copyright 2013-2017 IBM Corp. */
#include "hdif.h"
#include <stack.h>
const void *HDIF_get_idata(const struct HDIF_common_hdr *hdif, unsigned int di,
unsigned int *size)
{
const struct HDIF_common_hdr *hdr = hdif;
const struct HDIF_idata_ptr *iptr;
if (be16_to_cpu(hdr->d1f0) != 0xd1f0) {
prerror("HDIF: Bad header format !\n");
backtrace();
return NULL;
}
if (di >= be16_to_cpu(hdr->idptr_count)) {
prlog(PR_DEBUG, "HDIF: idata %d out of range for %.6s!\n",
di, hdr->id);
return NULL;
}
iptr = (void *)hdif + be32_to_cpu(hdr->idptr_off)
+ di * sizeof(struct HDIF_idata_ptr);
if (size)
*size = be32_to_cpu(iptr->size);
return (void *)hdif + be32_to_cpu(iptr->offset);
}
const void *HDIF_get_iarray_item(const struct HDIF_common_hdr *hdif,
unsigned int di, unsigned int ai,
unsigned int *size)
{
const struct HDIF_array_hdr *ahdr;
unsigned int asize;
const void *arr;
arr = HDIF_get_idata(hdif, di, &asize);
if (!arr)
return NULL;
if (asize < sizeof(struct HDIF_array_hdr)) {
prerror("HDIF: idata block too small for array !\n");
backtrace();
return NULL;
}
ahdr = arr;
if (ai >= be32_to_cpu(ahdr->ecnt)) {
prerror("HDIF: idata array index out of range !\n");
backtrace();
return NULL;
}
if (size)
*size = be32_to_cpu(ahdr->eactsz);
return arr + be32_to_cpu(ahdr->offset) + ai * be32_to_cpu(ahdr->esize);
}
int HDIF_get_iarray_size(const struct HDIF_common_hdr *hdif, unsigned int di)
{
const struct HDIF_array_hdr *ahdr;
unsigned int asize;
const void *arr;
arr = HDIF_get_idata(hdif, di, &asize);
if (!arr)
return -1;
if (asize < sizeof(struct HDIF_array_hdr)) {
prerror("HDIF: idata block too small for array !\n");
backtrace();
return -1;
}
ahdr = arr;
return be32_to_cpu(ahdr->ecnt);
}
/*
* Returns NULL and sets *items to zero when:
*
* a) Array extends beyond bounds (hard error)
* b) The array is empty (soft error)
* c) The item size is zero (soft error)
* d) The array is missing (soft error)
*
* b, c) are bugs in the input data so they generate backtraces.
*
* If you care about the soft error cases, retrive the array header manually
* with HDIF_get_idata().
*/
const struct HDIF_array_hdr *HDIF_get_iarray(const struct HDIF_common_hdr *hdif,
unsigned int di, unsigned int *items)
{
const struct HDIF_array_hdr *arr;
unsigned int req_size, size, elements;
unsigned int actual_sz, alloc_sz, offset;
arr = HDIF_get_idata(hdif, di, &size);
if(items)
*items = 0;
if (!arr || !size)
return NULL;
/* base size of an Idata array header */
offset = be32_to_cpu(arr->offset);
actual_sz = be32_to_cpu(arr->eactsz);
alloc_sz = be32_to_cpu(arr->esize);
elements = be32_to_cpu(arr->ecnt);
/* actual size should always be smaller than allocated */
if (alloc_sz < actual_sz) {
prerror("HDIF %.6s iarray %u has actsz (%u) < alloc_sz (%u)\n)",
hdif->id, di, actual_sz, alloc_sz);
backtrace();
return NULL;
}
req_size = elements * alloc_sz + offset;
if (req_size > size) {
prerror("HDIF: %.6s iarray %u requires %#x bytes, but only %#x are allocated!\n",
hdif->id, di, req_size, size);
backtrace();
return NULL;
}
if (!elements || !actual_sz)
return NULL;
if (items)
*items = elements;
return arr;
}
const void *HDIF_iarray_item(const struct HDIF_array_hdr *ahdr,
unsigned int index)
{
if (!ahdr || index >= be32_to_cpu(ahdr->ecnt))
return NULL;
return (const void * )ahdr + be32_to_cpu(ahdr->offset) +
index * be32_to_cpu(ahdr->esize);
}
struct HDIF_child_ptr *
HDIF_child_arr(const struct HDIF_common_hdr *hdif, unsigned int idx)
{
struct HDIF_child_ptr *children;
children = (void *)hdif + be32_to_cpu(hdif->child_off);
if (idx >= be16_to_cpu(hdif->child_count)) {
prerror("HDIF: child array idx out of range!\n");
backtrace();
return NULL;
}
return &children[idx];
}
struct HDIF_common_hdr *HDIF_child(const struct HDIF_common_hdr *hdif,
const struct HDIF_child_ptr *child,
unsigned int idx,
const char *eyecatcher)
{
void *base = (void *)hdif;
struct HDIF_common_hdr *ret;
long child_off;
/* child must be in hdif's child array */
child_off = (void *)child - (base + be32_to_cpu(hdif->child_off));
assert(child_off % sizeof(struct HDIF_child_ptr) == 0);
assert(child_off / sizeof(struct HDIF_child_ptr)
< be16_to_cpu(hdif->child_count));
assert(idx < be32_to_cpu(child->count));
if (be32_to_cpu(child->size) < sizeof(struct HDIF_common_hdr)) {
prerror("HDIF: %s child #%i too small: %u\n",
eyecatcher, idx, be32_to_cpu(child->size));
backtrace();
return NULL;
}
ret = base + be32_to_cpu(child->offset)
+ be32_to_cpu(child->size) * idx;
if (!HDIF_check(ret, eyecatcher)) {
prerror("HDIF: #%i bad type (wanted %6s, got %6s)\n",
idx, eyecatcher, ret->id);
backtrace();
return NULL;
}
return ret;
}
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