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/*
* zgetdump - Tool for copying and converting System z dumps
*
* Generic output dump format functions (DFO - Dump Format Output)
*
* Copyright IBM Corp. 2001, 2017
*
* s390-tools is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
#include <time.h>
#include "zgetdump.h"
#define dfo_chunk_iterate(dfo_chunk) \
util_list_iterate(&l.dump.chunk_list, dfo_chunk)
/*
* DFO vector
*/
static struct dfo *dfo_vec[] = {
&dfo_s390,
&dfo_elf,
NULL,
};
/*
* Dump (output) information
*/
struct dump {
u64 off; /* Current file offset in dump */
u64 size; /* Size of dump in bytes */
unsigned int chunk_cnt; /* Number of dump chunks */
struct util_list chunk_list; /* DFO chunk list */
};
/*
* File local static data
*/
static struct {
struct dump dump;
struct dfo *dfo;
} l;
/*
* Add dump chunk
*/
void dfo_chunk_add(u64 start, u64 size, void *data, dfo_chunk_read_fn read_fn)
{
struct dfo_chunk *dfo_chunk;
dfo_chunk = zg_alloc(sizeof(*dfo_chunk));
dfo_chunk->start = start;
dfo_chunk->end = start + size - 1;
dfo_chunk->size = size;
dfo_chunk->data = data;
dfo_chunk->read_fn = read_fn;
util_list_add_head(&l.dump.chunk_list, dfo_chunk);
l.dump.chunk_cnt++;
l.dump.size = MAX(l.dump.size, dfo_chunk->end + 1);
}
/*
* Dump chunk function: Copy zero pages for chunk
*/
void dfo_chunk_zero_fn(struct dfo_chunk *dfo_chunk, u64 off, void *buf, u64 cnt)
{
(void) dfo_chunk;
(void) off;
memset(buf, 0, cnt);
}
/*
* Dump chunk function: Copy given buffer for chunk
*/
void dfo_chunk_buf_fn(struct dfo_chunk *dfo_chunk, u64 off, void *buf, u64 cnt)
{
memcpy(buf, dfo_chunk->data + off, cnt);
}
/*
* Dump chunk function: Copy given memory range for chunk
*/
void dfo_chunk_mem_fn(struct dfo_chunk *dfo_chunk, u64 off, void *buf, u64 cnt)
{
struct dfi_mem_chunk *mem_chunk = dfo_chunk->data;
mem_chunk->read_fn(mem_chunk, off, buf, cnt);
}
/*
* Get DFO name
*/
const char *dfo_name(void)
{
return l.dfo->name;
}
/*
* Set DFO by name
*/
int dfo_set(const char *dfo_name)
{
struct dfo *dfo;
int i = 0;
while ((dfo = dfo_vec[i])) {
if (strcmp(dfo->name, dfo_name) == 0) {
l.dfo = dfo;
return 0;
}
i++;
}
return -ENODEV;
}
/*
* Initialize output dump format
*/
void dfo_init(void)
{
if (!l.dfo)
ABORT("DFO not set");
util_list_init(&l.dump.chunk_list, struct dfo_chunk, list);
l.dfo->init();
}
/*
* Find dump chunk for offset "off"
*
* This function is a bit hacky. DFO chunks can overlap. If two DFO chunks
* overlap, the last registered chunk wins. The dfo_chunk_find() function
* reflects that by returning the first memory chunk that is found in
* the dfo chunk list.
*
* In addition to that it calculates the "virtual end" of that chunk. An
* overlapping chunk can limit the "virtual end" of an underlying chunk so
* that the "virtual end" of that chunk is lower than the "real end".
*
* Example:
*
* chunk 1.: |------|
* chunk 2.: |---------------------|
* off.....: ^
* virt end: ^
* real end: ^
*
* In this case chunk 2 will be returned and "end" is set to the start of
* chunk 1.
*/
static struct dfo_chunk *dfo_chunk_find(u64 off, u64 *end)
{
struct dfo_chunk *dfo_chunk;
*end = U64_MAX;
dfo_chunk_iterate(dfo_chunk) {
if (dfo_chunk->start <= off && dfo_chunk->end >= off) {
*end = MIN(*end, dfo_chunk->end);
return dfo_chunk;
} else if (dfo_chunk->start > off) {
*end = MIN(*end, dfo_chunk->start - 1);
}
}
return NULL;
}
/*
* Seek to output dump offset "off"
*/
void dfo_seek(u64 off)
{
l.dump.off = off;
}
/*
* Read "cnt" bytes of output dump at current offest
*/
u64 dfo_read(void *buf, u64 cnt)
{
struct dfo_chunk *dfo_chunk;
u64 copied = 0, end, size;
u64 off = l.dump.off;
while (copied != cnt) {
dfo_chunk = dfo_chunk_find(off, &end);
if (!dfo_chunk)
goto out;
size = MIN(cnt - copied, end - off + 1);
dfo_chunk->read_fn(dfo_chunk, off - dfo_chunk->start,
buf + copied, size);
copied += size;
off += size;
}
out:
l.dump.off = off;
return copied;
}
/*
* Return output dump size
*/
u64 dfo_size(void)
{
return l.dump.size;
}
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