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Code Issues Releases Activity

gcore: Avoid using vm_map_entry_t.

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Use an internally defined structure instead, to avoid relying on kernel
structure details.  No functional change intended.

MFC after:	1 week
This commit is contained in:
Mark Johnston 2019-12-07 20:01:55 +00:00
parent 3098cd73a3
commit eae3ca5a06
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=355506
1 changed files with 27 additions and 20 deletions
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47
usr.bin/gcore/elfcore.c
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@ -44,8 +44,6 @@ __FBSDID("$FreeBSD$");
#include <machine/elf.h>
#include <vm/vm_param.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <assert.h>
#include <err.h>
#include <errno.h>
@ -64,7 +62,14 @@ __FBSDID("$FreeBSD$");
* Code for generating ELF core dumps.
*/
typedef void (*segment_callback)(vm_map_entry_t, void *);
struct map_entry {
struct map_entry *next;
vm_offset_t start;
vm_offset_t end;
vm_prot_t protection;
};
typedef void (*segment_callback)(struct map_entry *, void *);
/* Closure for cb_put_phdr(). */
struct phdr_closure {
@ -101,9 +106,9 @@ typedef struct ptrace_lwpinfo elfcore_lwpinfo_t;
typedef void* (*notefunc_t)(void *, size_t *);
static void cb_put_phdr(vm_map_entry_t, void *);
static void cb_size_segment(vm_map_entry_t, void *);
static void each_dumpable_segment(vm_map_entry_t, segment_callback,
static void cb_put_phdr(struct map_entry *, void *);
static void cb_size_segment(struct map_entry *, void *);
static void each_dumpable_segment(struct map_entry *, segment_callback,
void *closure);
static void elf_detach(void); /* atexit() handler. */
static void *elf_note_fpregset(void *, size_t *);
@ -130,12 +135,12 @@ static void *elf_note_procstat_psstrings(void *, size_t *);
static void *elf_note_procstat_rlimit(void *, size_t *);
static void *elf_note_procstat_umask(void *, size_t *);
static void *elf_note_procstat_vmmap(void *, size_t *);
static void elf_puthdr(int, pid_t, vm_map_entry_t, void *, size_t, size_t,
static void elf_puthdr(int, pid_t, struct map_entry *, void *, size_t, size_t,
size_t, int);
static void elf_putnote(int, notefunc_t, void *, struct sbuf *);
static void elf_putnotes(pid_t, struct sbuf *, size_t *);
static void freemap(vm_map_entry_t);
static vm_map_entry_t readmap(pid_t);
static void freemap(struct map_entry *);
static struct map_entry *readmap(pid_t);
static void *procstat_sysctl(void *, int, size_t, size_t *sizep);
static pid_t g_pid; /* Pid being dumped, global for elf_detach */
@ -193,7 +198,7 @@ elf_detach(void)
static void
elf_coredump(int efd, int fd, pid_t pid)
{
vm_map_entry_t map;
struct map_entry *map;
struct sseg_closure seginfo;
struct sbuf *sb;
void *hdr;
@ -294,7 +299,7 @@ elf_coredump(int efd, int fd, pid_t pid)
* program header entry.
*/
static void
cb_put_phdr(vm_map_entry_t entry, void *closure)
cb_put_phdr(struct map_entry *entry, void *closure)
{
struct phdr_closure *phc = (struct phdr_closure *)closure;
Elf_Phdr *phdr = phc->phdr;
@ -324,7 +329,7 @@ cb_put_phdr(vm_map_entry_t entry, void *closure)
* the number of segments and their total size.
*/
static void
cb_size_segment(vm_map_entry_t entry, void *closure)
cb_size_segment(struct map_entry *entry, void *closure)
{
struct sseg_closure *ssc = (struct sseg_closure *)closure;
@ -338,11 +343,12 @@ cb_size_segment(vm_map_entry_t entry, void *closure)
* data.
*/
static void
each_dumpable_segment(vm_map_entry_t map, segment_callback func, void *closure)
each_dumpable_segment(struct map_entry *map, segment_callback func,
void *closure)
{
vm_map_entry_t entry;
struct map_entry *entry;
for (entry = map; entry != NULL; entry = entry->next)
for (entry = map; entry != NULL; entry = entry->next)
(*func)(entry, closure);
}
@ -440,7 +446,7 @@ elf_putnote(int type, notefunc_t notefunc, void *arg, struct sbuf *sb)
* Generate the ELF coredump header.
*/
static void
elf_puthdr(int efd, pid_t pid, vm_map_entry_t map, void *hdr, size_t hdrsize,
elf_puthdr(int efd, pid_t pid, struct map_entry *map, void *hdr, size_t hdrsize,
size_t notesz, size_t segoff, int numsegs)
{
Elf_Ehdr *ehdr, binhdr;
@ -531,11 +537,12 @@ elf_puthdr(int efd, pid_t pid, vm_map_entry_t map, void *hdr, size_t hdrsize,
* Free the memory map.
*/
static void
freemap(vm_map_entry_t map)
freemap(struct map_entry *map)
{
struct map_entry *next;
while (map != NULL) {
vm_map_entry_t next = map->next;
next = map->next;
free(map);
map = next;
}
@ -547,10 +554,10 @@ freemap(vm_map_entry_t map)
* returned. The map entries in the list aren't fully filled in; only
* the items we need are present.
*/
static vm_map_entry_t
static struct map_entry *
readmap(pid_t pid)
{
vm_map_entry_t ent, *linkp, map;
struct map_entry *ent, **linkp, *map;
struct kinfo_vmentry *vmentl, *kve;
int i, nitems;