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Don't attempt to read process context from the kernel when (the

Browse source 
kernel's) curproc is null.  This fixes endless recursion in
xfer_umem() for attempts to read from user addresses, in particular
for attempts to read %fs and %gs from the pcb for `info reg'.
This commit is contained in:
Bruce Evans 1998-05-12 16:49:13 +00:00
parent 12e553e059
commit e7c80443b4
3 changed files with 6 additions and 6 deletions
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4
gnu/usr.bin/binutils/gdb/i386/kvm-fbsd.c
View file

@ -361,7 +361,7 @@ get_kcore_registers (regno)
struct user *uaddr;
/* find the pcb for the current process */
if (kvread (&cur_proc->p_addr, &uaddr))
if (cur_proc == NULL || kvread (&cur_proc->p_addr, &uaddr))
error ("cannot read u area ptr for proc at %#x", cur_proc);
if (read_pcb (core_kd, (CORE_ADDR)&uaddr->u_pcb) < 0)
error ("cannot read pcb at %#x", &uaddr->u_pcb);
@ -418,7 +418,7 @@ xfer_umem (memaddr, myaddr, len, write)
int n;
struct proc proc;
if (kvread (cur_proc, &proc))
if (cur_proc == NULL || kvread (cur_proc, &proc))
error ("cannot read proc at %#x", cur_proc);
n = kvm_uread (core_kd, &proc, memaddr, myaddr, len) ;

4
gnu/usr.bin/binutils/gdb/kvm-fbsd.c
View file

@ -361,7 +361,7 @@ get_kcore_registers (regno)
struct user *uaddr;
/* find the pcb for the current process */
if (kvread (&cur_proc->p_addr, &uaddr))
if (cur_proc == NULL || kvread (&cur_proc->p_addr, &uaddr))
error ("cannot read u area ptr for proc at %#x", cur_proc);
if (read_pcb (core_kd, (CORE_ADDR)&uaddr->u_pcb) < 0)
error ("cannot read pcb at %#x", &uaddr->u_pcb);
@ -418,7 +418,7 @@ xfer_umem (memaddr, myaddr, len, write)
int n;
struct proc proc;
if (kvread (cur_proc, &proc))
if (cur_proc == NULL || kvread (cur_proc, &proc))
error ("cannot read proc at %#x", cur_proc);
n = kvm_uread (core_kd, &proc, memaddr, myaddr, len) ;

4
gnu/usr.bin/gdb/gdb/kvm-fbsd.c
View file

@ -361,7 +361,7 @@ get_kcore_registers (regno)
struct user *uaddr;
/* find the pcb for the current process */
if (kvread (&cur_proc->p_addr, &uaddr))
if (cur_proc == NULL || kvread (&cur_proc->p_addr, &uaddr))
error ("cannot read u area ptr for proc at %#x", cur_proc);
if (read_pcb (core_kd, (CORE_ADDR)&uaddr->u_pcb) < 0)
error ("cannot read pcb at %#x", &uaddr->u_pcb);
@ -418,7 +418,7 @@ xfer_umem (memaddr, myaddr, len, write)
int n;
struct proc proc;
if (kvread (cur_proc, &proc))
if (cur_proc == NULL || kvread (cur_proc, &proc))
error ("cannot read proc at %#x", cur_proc);
n = kvm_uread (core_kd, &proc, memaddr, myaddr, len) ;