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From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
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From: Andrew Cagney <cagney@gnu.org>
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Date: Fri, 27 Oct 2017 21:07:50 +0200
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Subject: gdb-6.3-ppc64syscall-20040622.patch
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;; Better parse 64-bit PPC system call prologues.
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;;=push: Write new testcase.
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2004-06-22 Andrew Cagney <cagney@gnu.org>
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* rs6000-tdep.c (struct rs6000_framedata): Add field "func_start".
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(skip_prologue): Delete local variable "orig_pc", use
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"func_start". Add local variable "num_skip_linux_syscall_insn",
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use to skip over first half of a GNU/Linux syscall and update
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"func_start".
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diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c
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--- a/gdb/rs6000-tdep.c
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+++ b/gdb/rs6000-tdep.c
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@@ -134,6 +134,7 @@ static const char *powerpc_vector_abi_string = "auto";
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struct rs6000_framedata
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{
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+ CORE_ADDR func_start; /* True function start. */
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int offset; /* total size of frame --- the distance
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by which we decrement sp to allocate
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the frame */
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@@ -1426,7 +1427,6 @@ static CORE_ADDR
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skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, CORE_ADDR lim_pc,
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struct rs6000_framedata *fdata)
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{
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- CORE_ADDR orig_pc = pc;
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CORE_ADDR last_prologue_pc = pc;
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CORE_ADDR li_found_pc = 0;
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gdb_byte buf[4];
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@@ -1445,12 +1445,14 @@ skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, CORE_ADDR lim_pc,
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int minimal_toc_loaded = 0;
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int prev_insn_was_prologue_insn = 1;
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int num_skip_non_prologue_insns = 0;
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+ int num_skip_ppc64_gnu_linux_syscall_insn = 0;
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int r0_contains_arg = 0;
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const struct bfd_arch_info *arch_info = gdbarch_bfd_arch_info (gdbarch);
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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memset (fdata, 0, sizeof (struct rs6000_framedata));
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+ fdata->func_start = pc;
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fdata->saved_gpr = -1;
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fdata->saved_fpr = -1;
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fdata->saved_vr = -1;
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@@ -1484,6 +1486,55 @@ skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, CORE_ADDR lim_pc,
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break;
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op = extract_unsigned_integer (buf, 4, byte_order);
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+ /* A PPC64 GNU/Linux system call function is split into two
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+ sub-functions: a non-threaded fast-path (__NAME_nocancel)
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+ which does not use a frame; and a threaded slow-path
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+ (Lpseudo_cancel) that does create a frame. Ref:
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+ nptl/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep-cancel.h
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+
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+ *INDENT-OFF*
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+ NAME:
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+ SINGLE_THREAD_P
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+ bne- .Lpseudo_cancel
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+ __NAME_nocancel:
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+ li r0,162
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+ sc
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+ bnslr+
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+ b 0x7fe014ef64 <.__syscall_error>
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+ Lpseudo_cancel:
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+ stdu r1,-128(r1)
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+ ...
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+ *INDENT-ON*
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+
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+ Unfortunatly, because the latter case uses a local label (not
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+ in the symbol table) a PC in "Lpseudo_cancel" appears to be
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+ in "__NAME_nocancel". The following code recognizes this,
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+ adjusting FUNC_START to point to where "Lpseudo_cancel"
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+ should be, and parsing the prologue sequence as if
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+ "Lpseudo_cancel" was the entry point. */
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+
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+ if (((op & 0xffff0000) == 0x38000000 /* li r0,N */
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+ && pc == fdata->func_start + 0
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+ && num_skip_ppc64_gnu_linux_syscall_insn == 0)
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+ || (op == 0x44000002 /* sc */
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+ && pc == fdata->func_start + 4
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+ && num_skip_ppc64_gnu_linux_syscall_insn == 1)
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+ || (op == 0x4ca30020 /* bnslr+ */
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+ && pc == fdata->func_start + 8
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+ && num_skip_ppc64_gnu_linux_syscall_insn == 2))
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+ {
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+ num_skip_ppc64_gnu_linux_syscall_insn++;
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+ continue;
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+ }
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+ else if ((op & 0xfc000003) == 0x48000000 /* b __syscall_error */
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+ && pc == fdata->func_start + 12
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+ && num_skip_ppc64_gnu_linux_syscall_insn == 3)
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+ {
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+ num_skip_ppc64_gnu_linux_syscall_insn = -1;
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+ fdata->func_start = pc;
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+ continue;
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+ }
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+
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if ((op & 0xfc1fffff) == 0x7c0802a6)
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{ /* mflr Rx */
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/* Since shared library / PIC code, which needs to get its
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@@ -1673,9 +1724,9 @@ skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, CORE_ADDR lim_pc,
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we have no line table information or the line info tells
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us that the subroutine call is not part of the line
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associated with the prologue. */
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- if ((pc - orig_pc) > 8)
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+ if ((pc - fdata->func_start) > 8)
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{
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- struct symtab_and_line prologue_sal = find_pc_line (orig_pc, 0);
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+ struct symtab_and_line prologue_sal = find_pc_line (fdata->func_start, 0);
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struct symtab_and_line this_sal = find_pc_line (pc, 0);
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if ((prologue_sal.line == 0)
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