svn commit: r277167 - head/usr.bin/gcore

[Justin Hibbits]

Author: jhibbits
Date: Wed Jan 14 07:02:21 2015
New Revision: 277167
URL: https://svnweb.freebsd.org/changeset/base/277167

Log:
  Make use of the new Altivec ptrace support, to save the Altivec registers in
  gcore.
  
  MFC after:	2 weeks
  Relnotes:	yes

Modified:
  head/usr.bin/gcore/elfcore.c

Modified: head/usr.bin/gcore/elfcore.c
==============================================================================
--- head/usr.bin/gcore/elfcore.c	Wed Jan 14 07:01:21 2015	(r277166)
+++ head/usr.bin/gcore/elfcore.c	Wed Jan 14 07:02:21 2015	(r277167)
@@ -105,6 +105,9 @@ static void *elf_note_thrmisc(void *, si
 #if defined(__i386__) || defined(__amd64__)
 static void *elf_note_x86_xstate(void *, size_t *);
 #endif
+#if defined(__powerpc__)
+static void *elf_note_powerpc_vmx(void *, size_t *);
+#endif
 static void *elf_note_procstat_auxv(void *, size_t *);
 static void *elf_note_procstat_files(void *, size_t *);
 static void *elf_note_procstat_groups(void *, size_t *);
@@ -348,6 +351,9 @@ elf_putnotes(pid_t pid, struct sbuf *sb,
 #if defined(__i386__) || defined(__amd64__)
 		elf_putnote(NT_X86_XSTATE, elf_note_x86_xstate, tids + i, sb);
 #endif
+#if defined(__powerpc__)
+		elf_putnote(NT_PPC_VMX, elf_note_powerpc_vmx, tids + i, sb);
+#endif
 	}
 
 #ifndef ELFCORE_COMPAT_32
@@ -650,6 +656,32 @@ elf_note_x86_xstate(void *arg, size_t *s
 }
 #endif
 
+#if defined(__powerpc__)
+static void *
+elf_note_powerpc_vmx(void *arg, size_t *sizep)
+{
+	lwpid_t tid;
+	struct vmxreg *vmx;
+	static bool has_vmx = true;
+	struct vmxreg info;
+
+	tid = *(lwpid_t *)arg;
+	if (has_vmx) {
+		if (ptrace(PT_GETVRREGS, tid, (void *)&info,
+		    sizeof(info)) != 0)
+			has_vmx = false;
+	}
+	if (!has_vmx) {
+		*sizep = 0;
+		return (NULL);
+	}
+	vmx = calloc(1, sizeof(*vmx));
+	memcpy(vmx, &info, sizeof(*vmx));
+	*sizep = sizeof(*vmx);
+	return (vmx);
+}
+#endif
+
 static void *
 procstat_sysctl(void *arg, int what, size_t structsz, size_t *sizep)
 {