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2005-07-14 Jeff Johnsotn <jjohnstn@redhat.com>
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* linux-nat.c (linux_nat_xfer_memory): Incorporate Fujitsu
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work-around to use /proc/mem for storage, but to fall-back
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to PTRACE for ia64 rse register areas.
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* ia64-linux-nat.c (ia64_rse_slot_num): New static function.
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(ia64_rse_skip_regs): Ditto.
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(ia64_linux_check_stack_region): New function.
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Index: gdb-6.8.50.20090803/gdb/linux-nat.c
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===================================================================
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--- gdb-6.8.50.20090803.orig/gdb/linux-nat.c 2009-08-04 06:29:55.000000000 +0200
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+++ gdb-6.8.50.20090803/gdb/linux-nat.c 2009-08-04 06:30:53.000000000 +0200
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@@ -4495,15 +4495,38 @@ linux_xfer_partial (struct target_ops *o
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offset &= ((ULONGEST) 1 << addr_bit) - 1;
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}
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-#ifndef NATIVE_XFER_UNWIND_TABLE
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- /* FIXME: For ia64, we cannot currently use linux_proc_xfer_memory
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- for accessing thread storage. Revert when Bugzilla 147436
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- is fixed. */
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xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf,
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offset, len);
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if (xfer != 0)
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- return xfer;
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+ {
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+#ifdef NATIVE_XFER_UNWIND_TABLE
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+ struct mem_region range;
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+ range.lo = memaddr;
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+ range.hi = memaddr + len;
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+
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+ /* FIXME: For ia64, we cannot currently use
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+ linux_proc_xfer_partial for accessing rse register storage.
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+ Revert when Bugzilla 147436 is fixed. */
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+#ifdef NATIVE_XFER_UNWIND_TABLE
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+ extern int ia64_linux_check_stack_region (struct lwp_info *lwp,
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+ void *range);
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+#endif
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+ if (iterate_over_lwps (ia64_linux_check_stack_region, &range) != NULL)
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+ { /* This region contains ia64 rse registers, we have to re-read. */
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+ int xxfer;
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+
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+ /* Re-read register stack area. */
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+ xxfer = super_xfer_partial (ops, object, annex,
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+ readbuf + (range.lo - memaddr),
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+ writebuf + (range.lo - memaddr),
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+ offset + (range.lo - memaddr),
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+ range.hi - range.lo);
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+ if (xxfer == 0)
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+ xfer = 0;
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+ }
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#endif
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+ return xfer;
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+ }
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return super_xfer_partial (ops, object, annex, readbuf, writebuf,
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offset, len);
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Index: gdb-6.8.50.20090803/gdb/ia64-linux-nat.c
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===================================================================
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--- gdb-6.8.50.20090803.orig/gdb/ia64-linux-nat.c 2009-02-23 01:03:49.000000000 +0100
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+++ gdb-6.8.50.20090803/gdb/ia64-linux-nat.c 2009-08-04 06:30:53.000000000 +0200
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@@ -809,6 +809,64 @@ ia64_linux_xfer_partial (struct target_o
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void _initialize_ia64_linux_nat (void);
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+/*
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+ * Note: taken from ia64_tdep.c
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+ *
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+ */
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+
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+static __inline__ unsigned long
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+ia64_rse_slot_num (unsigned long addr)
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+{
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+ return (addr >> 3) & 0x3f;
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+}
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+
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+/* Skip over a designated number of registers in the backing
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+ store, remembering every 64th position is for NAT. */
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+static __inline__ unsigned long
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+ia64_rse_skip_regs (unsigned long addr, long num_regs)
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+{
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+ long delta = ia64_rse_slot_num(addr) + num_regs;
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+
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+ if (num_regs < 0)
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+ delta -= 0x3e;
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+ return addr + ((num_regs + delta/0x3f) << 3);
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+}
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+
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+/*
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+ * Check mem_region is stack or not. If stack, /proc/<pid>/mem cannot return
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+ * expected value.
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+ */
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+int ia64_linux_check_stack_region(struct lwp_info *ti, struct mem_region *range)
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+{
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+ CORE_ADDR addr;
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+ int error;
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+ unsigned long bsp, cfm, bspstore;
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+ long sof;
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+ pid_t pid = ptid_get_lwp(ti->ptid);
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+ bsp = ptrace(PTRACE_PEEKUSER, pid, PT_AR_BSP ,NULL);
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+ if (bsp == (unsigned long)-1) {
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+ return 1;
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+ }
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+ /* stack is allocated by one-segment, not separated into several segments.
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+ So, we only have to check whether bsp is in *range* or not. */
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+ if((range->lo <= bsp) && (bsp <= range->hi)) {
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+ bspstore = ptrace(PTRACE_PEEKUSER, pid, PT_AR_BSPSTORE, NULL);
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+ cfm = ptrace(PTRACE_PEEKUSER, pid, PT_CFM, NULL);
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+ sof = cfm & 0x3f;
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+ bsp = ia64_rse_skip_regs(bsp, -sof);
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+ range->lo = bspstore;
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+ range->hi = bsp;
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+ /* we have to check the size of dirty register stack area */
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+ /*
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+ fprintf_unfiltered(gdb_stdlog, "<%d> <%p> <%lx> <%p> <%p>\n",
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+ pid, bsp, sof, range->lo, range->hi);
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+ */
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+ return 1;
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+ }
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+
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+ return 0;
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+}
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+
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void
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_initialize_ia64_linux_nat (void)
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{
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