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procfs: quick-and-dirty /proc/kallsyms, missing modules

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This commit is contained in:
K. Lange 2021-09-13 18:56:55 +09:00
parent 9d609d15df
commit 39ebb4b6c0
3 changed files with 45 additions and 3 deletions
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1
base/usr/include/kernel/ksym.h
View File

@ -5,3 +5,4 @@
extern void ksym_install(void);
extern void ksym_bind(const char * symname, void * value);
extern void * ksym_lookup(const char * symname);
extern list_t * ksym_list(void);

6
kernel/misc/ksym.c
View File

@ -6,6 +6,7 @@
* boot methods to provide symbol tables for use with linking
* kernel modules.
*/
#include <kernel/types.h>
#include <kernel/hashmap.h>
#include <kernel/assert.h>
#include <kernel/ksym.h>
@ -26,3 +27,8 @@ void ksym_bind(const char * symname, void * value) {
void * ksym_lookup(const char * symname) {
return hashmap_get(ksym_hash, symname);
}
list_t * ksym_list(void) {
assert(ksym_hash != NULL);
return hashmap_keys(ksym_hash);
}

41
kernel/vfs/procfs.c
View File

@ -32,6 +32,7 @@
#include <kernel/mmu.h>
#include <kernel/misc.h>
#include <kernel/module.h>
#include <kernel/ksym.h>
#define PROCFS_STANDARD_ENTRIES (sizeof(std_entries) / sizeof(struct procfs_entry))
#define PROCFS_PROCDIR_ENTRIES (sizeof(procdir_entries) / sizeof(struct procfs_entry))
@ -674,6 +675,39 @@ static ssize_t idle_func(fs_node_t *node, off_t offset, size_t size, uint8_t *bu
return size;
}
static ssize_t kallsyms_func(fs_node_t *node, off_t offset, size_t size, uint8_t * buffer) {
/* This doesn't include module symbols at the moment... */
list_t * syms = ksym_list();
/* Figure out how much space needs to go in this buffer */
size_t total_size = 0;
foreach (node, syms) {
/* 16 for the address, one space, len(sym), one linefeed = 18 + strlen() */
total_size += 18 + strlen((char*)node->value);
}
char * buf = malloc(total_size);
size_t soffset = 0;
foreach(node, syms) {
soffset += snprintf(&buf[soffset], 100, "%016zx %s\n", this_core->current_process->user == USER_ROOT_UID ? (uintptr_t)ksym_lookup(node->value) : (uintptr_t)0, (char*)node->value);
}
if ((size_t)offset >= soffset) {
size = 0;
goto free_results;
}
if (size > soffset - offset) size = soffset - offset;
memcpy(buffer, buf + offset, size);
free_results:
list_free(syms);
free(syms);
free(buf);
return size;
}
static struct procfs_entry std_entries[] = {
{-1, "cpuinfo", cpuinfo_func},
{-2, "meminfo", meminfo_func},
@ -686,10 +720,11 @@ static struct procfs_entry std_entries[] = {
{-9, "filesystems", filesystems_func},
{-10,"loader", loader_func},
{-11,"idle", idle_func},
{-12,"kallsyms", kallsyms_func},
#ifdef __x86_64__
{-12,"irq", irq_func},
{-13,"pat", pat_func},
{-14,"pci", pci_func},
{-13,"irq", irq_func},
{-14,"pat", pat_func},
{-15,"pci", pci_func},
#endif
};