20f2be1d48
We need the 'page_size' variable in libperf, so move it there. Add a libperf_init() as a global libperf init function to obtain this value via sysconf() at tool start. Committer notes: Add internal/lib.h to tools/perf/ files using 'page_size', sometimes replacing util.h with it if that was the only reason for having util.h included. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Michael Petlan <mpetlan@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lore.kernel.org/lkml/20190913132355.21634-33-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include <internal/lib.h> // page_size
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#include "machine.h"
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#include "api/fs/fs.h"
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#include "debug.h"
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#include "symbol.h"
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int arch__fix_module_text_start(u64 *start, u64 *size, const char *name)
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{
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u64 m_start = *start;
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char path[PATH_MAX];
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snprintf(path, PATH_MAX, "module/%.*s/sections/.text",
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(int)strlen(name) - 2, name + 1);
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if (sysfs__read_ull(path, (unsigned long long *)start) < 0) {
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pr_debug2("Using module %s start:%#lx\n", path, m_start);
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*start = m_start;
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} else {
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/* Successful read of the modules segment text start address.
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* Calculate difference between module start address
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* in memory and module text segment start address.
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* For example module load address is 0x3ff8011b000
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* (from /proc/modules) and module text segment start
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* address is 0x3ff8011b870 (from file above).
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*
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* Adjust the module size and subtract the GOT table
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* size located at the beginning of the module.
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*/
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*size -= (*start - m_start);
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}
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return 0;
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}
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/* On s390 kernel text segment start is located at very low memory addresses,
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* for example 0x10000. Modules are located at very high memory addresses,
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* for example 0x3ff xxxx xxxx. The gap between end of kernel text segment
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* and beginning of first module's text segment is very big.
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* Therefore do not fill this gap and do not assign it to the kernel dso map.
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*/
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void arch__symbols__fixup_end(struct symbol *p, struct symbol *c)
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{
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if (strchr(p->name, '[') == NULL && strchr(c->name, '['))
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/* Last kernel symbol mapped to end of page */
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p->end = roundup(p->end, page_size);
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else
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p->end = c->start;
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pr_debug4("%s sym:%s end:%#lx\n", __func__, p->name, p->end);
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}
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