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// SPDX-License-Identifier: GPL-2.0
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <internal/lib.h> // page_size
#include "machine.h"
#include "api/fs/fs.h"
#include "debug.h"
#include "symbol.h"
int arch__fix_module_text_start(u64 *start, u64 *size, const char *name)
{
u64 m_start = *start;
char path[PATH_MAX];
snprintf(path, PATH_MAX, "module/%.*s/sections/.text",
(int)strlen(name) - 2, name + 1);
if (sysfs__read_ull(path, (unsigned long long *)start) < 0) {
pr_debug2("Using module %s start:%#lx\n", path, m_start);
*start = m_start;
} else {
/* Successful read of the modules segment text start address.
* Calculate difference between module start address
* in memory and module text segment start address.
* For example module load address is 0x3ff8011b000
* (from /proc/modules) and module text segment start
* address is 0x3ff8011b870 (from file above).
*
* Adjust the module size and subtract the GOT table
* size located at the beginning of the module.
*/
*size -= (*start - m_start);
}
return 0;
}
/* On s390 kernel text segment start is located at very low memory addresses,
* for example 0x10000. Modules are located at very high memory addresses,
* for example 0x3ff xxxx xxxx. The gap between end of kernel text segment
* and beginning of first module's text segment is very big.
* Therefore do not fill this gap and do not assign it to the kernel dso map.
*/
void arch__symbols__fixup_end(struct symbol *p, struct symbol *c)
{
if (strchr(p->name, '[') == NULL && strchr(c->name, '['))
/* Last kernel symbol mapped to end of page */
p->end = roundup(p->end, page_size);
else
p->end = c->start;
pr_debug4("%s sym:%s end:%#lx\n", __func__, p->name, p->end);
}
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