Date: Fri, 23 Jul 1999 03:13:37 +1000 From: Bruce Evans <bde@zeta.org.au> To: bde@zeta.org.au, cracauer@cons.org Cc: freebsd-current@FreeBSD.ORG Subject: Re: Using float emulator on a system with FPU? Message-ID: <199907221713.DAA03332@godzilla.zeta.org.au>
next in thread | raw e-mail | index | archive | help
>I am now able to switch "npx_exists" between npx_probe1() and
>npx_attach(), which let me run with the emulator on a Pentium.
>
>But only from serial kgdb, since as you noted in your other message,
>symbols are not available to ddb in ELF kernels started with -d.
>
>I assume you use kdb_init() from db_elf.c, you how do you call it
>given that you neither have the symbol (not loaded yet) nor the
>address (`nm /kernel` output not useful)?
The boot loader passes the relevant addresses.
To use this, replace ddb_kld.c by ddb_elf.c in /sys/conf/files.
Bruce
diff -c2 db_elf.c~ db_elf.c
*** db_elf.c~ Thu Jan 28 22:05:22 1999
--- db_elf.c Sat May 8 15:58:30 1999
***************
*** 39,55 ****
*/
! #if defined(__ELF__) && defined(__alpha__)
#include "opt_ddb.h"
- #include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
- #include <sys/proc.h>
! #include <machine/db_machdep.h>
#include <ddb/db_sym.h>
- #include <ddb/db_output.h>
#include <machine/elf.h>
--- 39,53 ----
*/
! #ifdef __ELF__
#include "opt_ddb.h"
#include <sys/param.h>
#include <sys/systm.h>
! #include <machine/bootinfo.h>
+ #include <ddb/ddb.h>
#include <ddb/db_sym.h>
#include <machine/elf.h>
***************
*** 81,88 ****
--- 79,88 ----
int i;
+ #if 0
if (ALIGNED_POINTER(symtab, long) == 0) {
printf("DDB: bad symbol table start address %p\n", symtab);
return;
}
+ #endif
symtab_start = symtab_end = NULL;
***************
*** 162,169 ****
--- 162,171 ----
* Now, sanity check the symbols against the string table.
*/
+ #if 0
if (symtab_start == NULL || strtab_start == NULL ||
ALIGNED_POINTER(symtab_start, long) == 0 ||
ALIGNED_POINTER(strtab_start, long) == 0)
goto badheader;
+ #endif
for (symp = symtab_start; symp < symtab_end; symp++)
if (symp->st_name + strtab_start > strtab_end)
***************
*** 216,220 ****
* Lookup the symbol with the given name.
*/
! db_sym_t
X_db_lookup(stab, symstr)
db_symtab_t *stab;
--- 218,222 ----
* Lookup the symbol with the given name.
*/
! c_db_sym_t
X_db_lookup(stab, symstr)
db_symtab_t *stab;
***************
*** 228,231 ****
--- 230,234 ----
strtab = db_elf_find_strtab(stab);
+ strtab = (char *)stab->end + 4;
if (strtab == NULL)
return ((db_sym_t)0);
***************
*** 244,248 ****
* provided threshold).
*/
! db_sym_t
X_db_search_symbol(symtab, off, strategy, diffp)
db_symtab_t *symtab;
--- 247,251 ----
* provided threshold).
*/
! c_db_sym_t
X_db_search_symbol(symtab, off, strategy, diffp)
db_symtab_t *symtab;
***************
*** 262,268 ****
--- 265,273 ----
if (symp->st_name == 0)
continue;
+ #if 0
if (ELF_ST_TYPE(symp->st_info) != STT_OBJECT &&
ELF_ST_TYPE(symp->st_info) != STT_FUNC)
continue;
+ #endif
if (off >= symp->st_value) {
***************
*** 310,322 ****
X_db_symbol_values(symtab, sym, namep, valuep)
db_symtab_t *symtab;
! db_sym_t sym;
const char **namep;
db_expr_t *valuep;
{
! Elf_Sym *symp = (Elf_Sym *)sym;
char *strtab;
if (namep) {
strtab = db_elf_find_strtab(symtab);
if (strtab == NULL)
*namep = NULL;
--- 315,328 ----
X_db_symbol_values(symtab, sym, namep, valuep)
db_symtab_t *symtab;
! c_db_sym_t sym;
const char **namep;
db_expr_t *valuep;
{
! const Elf_Sym *symp = (const Elf_Sym *)sym;
char *strtab;
if (namep) {
strtab = db_elf_find_strtab(symtab);
+ strtab = (char *)symtab->end + 4;
if (strtab == NULL)
*namep = NULL;
***************
*** 336,340 ****
X_db_line_at_pc(symtab, cursym, filename, linenum, off)
db_symtab_t *symtab;
! db_sym_t cursym;
char **filename;
int *linenum;
--- 342,346 ----
X_db_line_at_pc(symtab, cursym, filename, linenum, off)
db_symtab_t *symtab;
! c_db_sym_t cursym;
char **filename;
int *linenum;
***************
*** 375,381 ****
{
if (ksym_end > ksym_start)
X_db_sym_init(ksym_start, ksym_end, "kernel");
}
! #endif
--- 381,395 ----
{
+ #ifdef __i386__
+ if (bootinfo.bi_esymtab != bootinfo.bi_symtab)
+ db_add_symbol_table(
+ (char *)bootinfo.bi_symtab + 4,
+ (char *)bootinfo.bi_symtab + 4 + *(int *)bootinfo.bi_symtab,
+ "kernel", (char *)bootinfo.bi_symtab);
+ #else
if (ksym_end > ksym_start)
X_db_sym_init(ksym_start, ksym_end, "kernel");
+ #endif
}
! #endif /* __ELF__ */
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199907221713.DAA03332>