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Index: lib/libc/sys/ptrace.2
===================================================================
--- lib/libc/sys/ptrace.2
+++ lib/libc/sys/ptrace.2
@@ -2,7 +2,7 @@
.\" $NetBSD: ptrace.2,v 1.2 1995/02/27 12:35:37 cgd Exp $
.\"
.\" This file is in the public domain.
-.Dd July 15, 2019
+.Dd April 10, 2021
.Dt PTRACE 2
.Os
.Sh NAME
@@ -807,6 +807,20 @@
The
.Fa data
argument is ignored.
+.It Dv PT_COREDUMP
+This request creates a coredump for the stopped program.
+.Fa addr
+argument specifies a pointer to a
+.Vt "struct ptrace_coredump" ,
+which is defined as follows:
+.Bd -literal
+struct ptrace_coredump {
+ TODO;
+};
+.Ed
+.Pp
+The size of the structmust be passed in
+.Fa data .
.El
.Sh ARM MACHINE-SPECIFIC REQUESTS
.Bl -tag -width "Dv PT_SETVFPREGS"
Index: sys/kern/sys_process.c
===================================================================
--- sys/kern/sys_process.c
+++ sys/kern/sys_process.c
@@ -51,6 +51,8 @@
#include <sys/sx.h>
#include <sys/malloc.h>
#include <sys/signalvar.h>
+#include <sys/caprights.h>
+#include <sys/filedesc.h>
#include <machine/reg.h>
@@ -446,6 +448,33 @@
return (error);
}
+static int
+ptrace_coredump(struct thread *tracer, struct thread *tracee,
+ struct ptrace_coredump *pc)
+{
+ int error;
+ struct file *fp;
+ struct vnode *vp;
+ struct proc *p = tracee->td_proc;
+
+ if (p->p_sysent->sv_coredump == NULL)
+ return (ENOSYS);
+
+ error = getvnode(tracer, pc->pc_fd, &cap_write_rights, &fp);
+ if (error != 0)
+ return (error);
+
+ vp = fp->f_vnode;
+ /* do not try writing to non-regular files */
+ if (vp->v_type != VREG)
+ return (EFAULT);
+
+ error = p->p_sysent->sv_coredump(tracee, vp, OFF_MAX, 0);
+
+ fdrop(fp, tracer);
+ return (error);
+}
+
/*
* Process debugging system call.
*/
@@ -469,6 +498,7 @@
struct ptrace_io_desc piod;
struct ptrace_lwpinfo pl;
struct ptrace_vm_entry pve;
+ struct ptrace_coredump pc;
struct dbreg dbreg;
struct fpreg fpreg;
struct reg reg;
@@ -519,6 +549,12 @@
case PT_VM_ENTRY:
error = copyin(uap->addr, &r.pve, sizeof(r.pve));
break;
+ case PT_COREDUMP:
+ if (uap->data != sizeof(r.pc))
+ error = EINVAL;
+ else
+ error = copyin(uap->addr, &r.pc, uap->data);
+ break;
default:
addr = uap->addr;
break;
@@ -1299,6 +1335,12 @@
PROC_LOCK(p);
break;
+ case PT_COREDUMP:
+ PROC_UNLOCK(p);
+ error = ptrace_coredump(td, td2, addr);
+ PROC_LOCK(p);
+ break;
+
default:
#ifdef __HAVE_PTRACE_MACHDEP
if (req >= PT_FIRSTMACH) {
Index: sys/sys/ptrace.h
===================================================================
--- sys/sys/ptrace.h
+++ sys/sys/ptrace.h
@@ -74,6 +74,8 @@
#define PT_GET_SC_ARGS 27 /* fetch syscall args */
#define PT_GET_SC_RET 28 /* fetch syscall results */
+#define PT_COREDUMP 29 /* create a coredump */
+
#define PT_GETREGS 33 /* get general-purpose registers */
#define PT_SETREGS 34 /* set general-purpose registers */
#define PT_GETFPREGS 35 /* get floating-point registers */
@@ -176,6 +178,11 @@
char *pve_path; /* Path name of object. */
};
+/* Argument structure for PT_COREDUMP. */
+struct ptrace_coredump {
+ int pc_fd; /* File descriptor to write dump to. */
+};
+
#ifdef _KERNEL
int ptrace_set_pc(struct thread *_td, unsigned long _addr);

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