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Add support for booting into kdb on arm platforms when the RB_KDB is set

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(using "boot -d" at the loader propmt or setting boot_ddb in loader.conf).

Submitted by:	Thomas Skibo <thomasskibo@yahoo.com>
Differential Revision:	https://reviews.freebsd.org/D14428
This commit is contained in:
Ian Lepore 2018-02-25 18:42:59 +00:00
parent f0a2d31ab1
commit bf56e64a4c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=329989
2 changed files with 18 additions and 2 deletions
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15
sys/arm/arm/machdep.c
View File

@ -66,6 +66,7 @@ __FBSDID("$FreeBSD$");
#include <sys/kernel.h>
#include <sys/linker.h>
#include <sys/msgbuf.h>
#include <sys/reboot.h>
#include <sys/rwlock.h>
#include <sys/sched.h>
#include <sys/syscallsubr.h>
@ -785,6 +786,16 @@ set_stackptrs(int cpu)
}
#endif
static void
arm_kdb_init(void)
{
kdb_init();
#ifdef KDB
if (boothowto & RB_KDB)
kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
#endif
}
#ifdef FDT
#if __ARM_ARCH < 6
@ -1054,7 +1065,7 @@ initarm(struct arm_boot_params *abp)
init_param2(physmem);
dbg_monitor_init();
kdb_init();
arm_kdb_init();
return ((void *)(kernelstack.pv_va + USPACE_SVC_STACK_TOP -
sizeof(struct pcb)));
@ -1263,7 +1274,7 @@ initarm(struct arm_boot_params *abp)
/* Init message buffer. */
msgbufinit(msgbufp, msgbufsize);
dbg_monitor_init();
kdb_init();
arm_kdb_init();
/* Apply possible BP hardening. */
cpuinfo_init_bp_hardening();
return ((void *)STACKALIGN(thread0.td_pcb));

5
sys/arm/arm/machdep_boot.c
View File

@ -27,6 +27,7 @@
*/
#include "opt_platform.h"
#include "opt_ddb.h"
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
@ -57,6 +58,10 @@ __FBSDID("$FreeBSD$");
#include <sys/efi.h>
#endif
#ifdef DDB
#include <ddb/ddb.h>
#endif
#ifdef DEBUG
#define debugf(fmt, args...) printf(fmt, ##args)
#else