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Diffstat (limited to 'sys/cddl/dev/fbt/powerpc/fbt_isa.c')
-rw-r--r--sys/cddl/dev/fbt/powerpc/fbt_isa.c252
1 files changed, 252 insertions, 0 deletions
diff --git a/sys/cddl/dev/fbt/powerpc/fbt_isa.c b/sys/cddl/dev/fbt/powerpc/fbt_isa.c
new file mode 100644
index 000000000000..d55d553d9cd1
--- /dev/null
+++ b/sys/cddl/dev/fbt/powerpc/fbt_isa.c
@@ -0,0 +1,252 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ *
+ * Portions Copyright 2006-2008 John Birrell jb@freebsd.org
+ * Portions Copyright 2013 Justin Hibbits jhibbits@freebsd.org
+ *
+ * $FreeBSD$
+ *
+ */
+
+/*
+ * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#include <sys/cdefs.h>
+#include <sys/param.h>
+#include <sys/dtrace.h>
+#include <machine/md_var.h>
+
+#include "fbt.h"
+
+#define FBT_PATCHVAL 0x7c810808
+#define FBT_MFLR_R0 0x7c0802a6
+#define FBT_MTLR_R0 0x7c0803a6
+#define FBT_BLR 0x4e800020
+#define FBT_BCTR 0x4e800030
+#define FBT_BRANCH 0x48000000
+#define FBT_BR_MASK 0x03fffffc
+#define FBT_IS_JUMP(instr) ((instr & ~FBT_BR_MASK) == FBT_BRANCH)
+
+#define FBT_ENTRY "entry"
+#define FBT_RETURN "return"
+#define FBT_AFRAMES 7
+
+int
+fbt_invop(uintptr_t addr, uintptr_t *stack, uintptr_t rval)
+{
+ struct trapframe *frame = (struct trapframe *)stack;
+ solaris_cpu_t *cpu = &solaris_cpu[curcpu];
+ fbt_probe_t *fbt = fbt_probetab[FBT_ADDR2NDX(addr)];
+ uintptr_t tmp;
+
+ for (; fbt != NULL; fbt = fbt->fbtp_hashnext) {
+ if ((uintptr_t)fbt->fbtp_patchpoint == addr) {
+ if (fbt->fbtp_roffset == 0) {
+ cpu->cpu_dtrace_caller = addr;
+
+ dtrace_probe(fbt->fbtp_id, frame->fixreg[3],
+ frame->fixreg[4], frame->fixreg[5],
+ frame->fixreg[6], frame->fixreg[7]);
+
+ cpu->cpu_dtrace_caller = 0;
+ } else {
+
+ dtrace_probe(fbt->fbtp_id, fbt->fbtp_roffset,
+ rval, 0, 0, 0);
+ /*
+ * The caller doesn't have the fbt item, so
+ * fixup tail calls here.
+ */
+ if (fbt->fbtp_rval == DTRACE_INVOP_JUMP) {
+ frame->srr0 = (uintptr_t)fbt->fbtp_patchpoint;
+ tmp = fbt->fbtp_savedval & FBT_BR_MASK;
+ /* Sign extend. */
+ if (tmp & 0x02000000)
+#ifdef __powerpc64__
+ tmp |= 0xfffffffffc000000ULL;
+#else
+ tmp |= 0xfc000000UL;
+#endif
+ frame->srr0 += tmp;
+ }
+ cpu->cpu_dtrace_caller = 0;
+ }
+
+ return (fbt->fbtp_rval);
+ }
+ }
+
+ return (0);
+}
+
+void
+fbt_patch_tracepoint(fbt_probe_t *fbt, fbt_patchval_t val)
+{
+
+ *fbt->fbtp_patchpoint = val;
+ __syncicache(fbt->fbtp_patchpoint, 4);
+}
+
+int
+fbt_provide_module_function(linker_file_t lf, int symindx,
+ linker_symval_t *symval, void *opaque)
+{
+ char *modname = opaque;
+ const char *name = symval->name;
+ fbt_probe_t *fbt, *retfbt;
+ int j;
+ uint32_t *instr, *limit;
+
+#ifdef __powerpc64__
+ /*
+ * PowerPC64 uses '.' prefixes on symbol names, ignore it, but only
+ * allow symbols with the '.' prefix, so that we don't get the function
+ * descriptor instead.
+ */
+ if (name[0] == '.')
+ name++;
+ else
+ return (0);
+#endif
+
+ if (strncmp(name, "dtrace_", 7) == 0 &&
+ strncmp(name, "dtrace_safe_", 12) != 0) {
+ /*
+ * Anything beginning with "dtrace_" may be called
+ * from probe context unless it explicitly indicates
+ * that it won't be called from probe context by
+ * using the prefix "dtrace_safe_".
+ */
+ return (0);
+ }
+
+ if (name[0] == '_' && name[1] == '_')
+ return (0);
+
+ instr = (uint32_t *) symval->value;
+ limit = (uint32_t *) (symval->value + symval->size);
+
+ for (; instr < limit; instr++)
+ if (*instr == FBT_MFLR_R0)
+ break;
+
+ if (*instr != FBT_MFLR_R0)
+ return (0);
+
+ fbt = malloc(sizeof (fbt_probe_t), M_FBT, M_WAITOK | M_ZERO);
+ fbt->fbtp_name = name;
+ fbt->fbtp_id = dtrace_probe_create(fbt_id, modname,
+ name, FBT_ENTRY, FBT_AFRAMES, fbt);
+ fbt->fbtp_patchpoint = instr;
+ fbt->fbtp_ctl = lf;
+ fbt->fbtp_loadcnt = lf->loadcnt;
+ fbt->fbtp_savedval = *instr;
+ fbt->fbtp_patchval = FBT_PATCHVAL;
+ fbt->fbtp_rval = DTRACE_INVOP_MFLR_R0;
+ fbt->fbtp_symindx = symindx;
+
+ fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)];
+ fbt_probetab[FBT_ADDR2NDX(instr)] = fbt;
+
+ lf->fbt_nentries++;
+
+ retfbt = NULL;
+again:
+ if (instr >= limit)
+ return (0);
+
+ /*
+ * We (desperately) want to avoid erroneously instrumenting a
+ * jump table. To determine if we're looking at a true instruction
+ * sequence or an inline jump table that happens to contain the same
+ * byte sequences, we resort to some heuristic sleeze: we treat this
+ * instruction as being contained within a pointer, and see if that
+ * pointer points to within the body of the function. If it does, we
+ * refuse to instrument it.
+ */
+ {
+ uint32_t *ptr;
+
+ ptr = *(uint32_t **)instr;
+
+ if (ptr >= (uint32_t *) symval->value && ptr < limit) {
+ instr++;
+ goto again;
+ }
+ }
+
+ if (*instr != FBT_MTLR_R0) {
+ instr++;
+ goto again;
+ }
+
+ instr++;
+
+ for (j = 0; j < 12 && instr < limit; j++, instr++) {
+ if ((*instr == FBT_BCTR) || (*instr == FBT_BLR) ||
+ FBT_IS_JUMP(*instr))
+ break;
+ }
+
+ if (!(*instr == FBT_BCTR || *instr == FBT_BLR || FBT_IS_JUMP(*instr)))
+ goto again;
+
+ /*
+ * We have a winner!
+ */
+ fbt = malloc(sizeof (fbt_probe_t), M_FBT, M_WAITOK | M_ZERO);
+ fbt->fbtp_name = name;
+
+ if (retfbt == NULL) {
+ fbt->fbtp_id = dtrace_probe_create(fbt_id, modname,
+ name, FBT_RETURN, FBT_AFRAMES, fbt);
+ } else {
+ retfbt->fbtp_next = fbt;
+ fbt->fbtp_id = retfbt->fbtp_id;
+ }
+
+ retfbt = fbt;
+ fbt->fbtp_patchpoint = instr;
+ fbt->fbtp_ctl = lf;
+ fbt->fbtp_loadcnt = lf->loadcnt;
+ fbt->fbtp_symindx = symindx;
+
+ if (*instr == FBT_BCTR)
+ fbt->fbtp_rval = DTRACE_INVOP_BCTR;
+ else if (*instr == FBT_BLR)
+ fbt->fbtp_rval = DTRACE_INVOP_RET;
+ else
+ fbt->fbtp_rval = DTRACE_INVOP_JUMP;
+
+ fbt->fbtp_roffset =
+ (uintptr_t)((uint8_t *)instr - (uint8_t *)symval->value);
+
+ fbt->fbtp_savedval = *instr;
+ fbt->fbtp_patchval = FBT_PATCHVAL;
+ fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)];
+ fbt_probetab[FBT_ADDR2NDX(instr)] = fbt;
+
+ lf->fbt_nentries++;
+
+ instr += 4;
+ goto again;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-23 11:23:42 +0000