/* Target-dependent code for GDB, the GNU debugger.
Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996,
- 1997, 2000, 2001, 2002 Free Software Foundation, Inc.
+ 1997, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
This file is part of GDB.
#include "objfiles.h"
#include "regcache.h"
#include "value.h"
+#include "osabi.h"
#include "solib-svr4.h"
#include "ppc-tdep.h"
-/* The following two instructions are used in the signal trampoline
- code on GNU/Linux PPC. */
-#define INSTR_LI_R0_0x7777 0x38007777
-#define INSTR_SC 0x44000002
+/* The following instructions are used in the signal trampoline code
+ on GNU/Linux PPC. The kernel used to use magic syscalls 0x6666 and
+ 0x7777 but now uses the sigreturn syscalls. We check for both. */
+#define INSTR_LI_R0_0x6666 0x38006666
+#define INSTR_LI_R0_0x7777 0x38007777
+#define INSTR_LI_R0_NR_sigreturn 0x38000077
+#define INSTR_LI_R0_NR_rt_sigreturn 0x380000AC
+
+#define INSTR_SC 0x44000002
/* Since the *-tdep.c files are platform independent (i.e, they may be
used to build cross platform debuggers), we can't include system
behavior is ever fixed.)
PC_IN_SIGTRAMP is called from blockframe.c as well in order to set
- the signal_handler_caller flag. Because of our strange definition
- of in_sigtramp below, we can't rely on signal_handler_caller
+ the frame's type (if a SIGTRAMP_FRAME). Because of our strange
+ definition of in_sigtramp below, we can't rely on the frame's type
getting set correctly from within blockframe.c. This is why we
- take pains to set it in init_extra_frame_info(). */
+ take pains to set it in init_extra_frame_info().
+
+ NOTE: cagney/2002-11-10: I suspect the real problem here is that
+ the get_prev_frame() only initializes the frame's type after the
+ call to INIT_FRAME_INFO. get_prev_frame() should be fixed, this
+ code shouldn't be working its way around a bug :-(. */
int
ppc_linux_in_sigtramp (CORE_ADDR pc, char *func_name)
return (pc == handler || pc == handler + 4);
}
+static inline int
+insn_is_sigreturn (unsigned long pcinsn)
+{
+ switch(pcinsn)
+ {
+ case INSTR_LI_R0_0x6666:
+ case INSTR_LI_R0_0x7777:
+ case INSTR_LI_R0_NR_sigreturn:
+ case INSTR_LI_R0_NR_rt_sigreturn:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
/*
* The signal handler trampoline is on the stack and consists of exactly
* two instructions. The easiest and most accurate way of determining
pcinsn = extract_unsigned_integer (buf + 4, 4);
return (
- (pcinsn == INSTR_LI_R0_0x7777
+ (insn_is_sigreturn (pcinsn)
&& extract_unsigned_integer (buf + 8, 4) == INSTR_SC)
||
(pcinsn == INSTR_SC
- && extract_unsigned_integer (buf, 4) == INSTR_LI_R0_0x7777));
+ && insn_is_sigreturn (extract_unsigned_integer (buf, 4))));
}
CORE_ADDR
CORE_ADDR
ppc_linux_frame_saved_pc (struct frame_info *fi)
{
- if (fi->signal_handler_caller)
+ if ((get_frame_type (fi) == SIGTRAMP_FRAME))
{
CORE_ADDR regs_addr =
- read_memory_integer (fi->frame + PPC_LINUX_REGS_PTR_OFFSET, 4);
+ read_memory_integer (get_frame_base (fi)
+ + PPC_LINUX_REGS_PTR_OFFSET, 4);
/* return the NIP in the regs array */
return read_memory_integer (regs_addr + 4 * PPC_LINUX_PT_NIP, 4);
}
- else if (fi->next && fi->next->signal_handler_caller)
+ else if (get_next_frame (fi)
+ && (get_frame_type (get_next_frame (fi)) == SIGTRAMP_FRAME))
{
CORE_ADDR regs_addr =
- read_memory_integer (fi->next->frame + PPC_LINUX_REGS_PTR_OFFSET, 4);
+ read_memory_integer (get_frame_base (get_next_frame (fi))
+ + PPC_LINUX_REGS_PTR_OFFSET, 4);
/* return LNK in the regs array */
return read_memory_integer (regs_addr + 4 * PPC_LINUX_PT_LNK, 4);
}
{
rs6000_init_extra_frame_info (fromleaf, fi);
- if (fi->next != 0)
+ if (get_next_frame (fi) != 0)
{
/* We're called from get_prev_frame_info; check to see if
this is a signal frame by looking to see if the pc points
at trampoline code */
- if (ppc_linux_at_sigtramp_return_path (fi->pc))
- fi->signal_handler_caller = 1;
+ if (ppc_linux_at_sigtramp_return_path (get_frame_pc (fi)))
+ deprecated_set_frame_type (fi, SIGTRAMP_FRAME);
else
- fi->signal_handler_caller = 0;
+ /* FIXME: cagney/2002-11-10: Is this double bogus? What
+ happens if the frame has previously been marked as a dummy? */
+ deprecated_set_frame_type (fi, NORMAL_FRAME);
}
}
{
/* We'll find the wrong thing if we let
rs6000_frameless_function_invocation () search for a signal trampoline */
- if (ppc_linux_at_sigtramp_return_path (fi->pc))
+ if (ppc_linux_at_sigtramp_return_path (get_frame_pc (fi)))
return 0;
else
return rs6000_frameless_function_invocation (fi);
void
ppc_linux_frame_init_saved_regs (struct frame_info *fi)
{
- if (fi->signal_handler_caller)
+ if ((get_frame_type (fi) == SIGTRAMP_FRAME))
{
CORE_ADDR regs_addr;
int i;
- if (fi->saved_regs)
+ if (get_frame_saved_regs (fi))
return;
frame_saved_regs_zalloc (fi);
regs_addr =
- read_memory_integer (fi->frame + PPC_LINUX_REGS_PTR_OFFSET, 4);
- fi->saved_regs[PC_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_NIP;
- fi->saved_regs[gdbarch_tdep (current_gdbarch)->ppc_ps_regnum] =
+ read_memory_integer (get_frame_base (fi)
+ + PPC_LINUX_REGS_PTR_OFFSET, 4);
+ get_frame_saved_regs (fi)[PC_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_NIP;
+ get_frame_saved_regs (fi)[gdbarch_tdep (current_gdbarch)->ppc_ps_regnum] =
regs_addr + 4 * PPC_LINUX_PT_MSR;
- fi->saved_regs[gdbarch_tdep (current_gdbarch)->ppc_cr_regnum] =
+ get_frame_saved_regs (fi)[gdbarch_tdep (current_gdbarch)->ppc_cr_regnum] =
regs_addr + 4 * PPC_LINUX_PT_CCR;
- fi->saved_regs[gdbarch_tdep (current_gdbarch)->ppc_lr_regnum] =
+ get_frame_saved_regs (fi)[gdbarch_tdep (current_gdbarch)->ppc_lr_regnum] =
regs_addr + 4 * PPC_LINUX_PT_LNK;
- fi->saved_regs[gdbarch_tdep (current_gdbarch)->ppc_ctr_regnum] =
+ get_frame_saved_regs (fi)[gdbarch_tdep (current_gdbarch)->ppc_ctr_regnum] =
regs_addr + 4 * PPC_LINUX_PT_CTR;
- fi->saved_regs[gdbarch_tdep (current_gdbarch)->ppc_xer_regnum] =
+ get_frame_saved_regs (fi)[gdbarch_tdep (current_gdbarch)->ppc_xer_regnum] =
regs_addr + 4 * PPC_LINUX_PT_XER;
- fi->saved_regs[gdbarch_tdep (current_gdbarch)->ppc_mq_regnum] =
+ get_frame_saved_regs (fi)[gdbarch_tdep (current_gdbarch)->ppc_mq_regnum] =
regs_addr + 4 * PPC_LINUX_PT_MQ;
for (i = 0; i < 32; i++)
- fi->saved_regs[gdbarch_tdep (current_gdbarch)->ppc_gp0_regnum + i] =
+ get_frame_saved_regs (fi)[gdbarch_tdep (current_gdbarch)->ppc_gp0_regnum + i] =
regs_addr + 4 * PPC_LINUX_PT_R0 + 4 * i;
for (i = 0; i < 32; i++)
- fi->saved_regs[FP0_REGNUM + i] = regs_addr + 4 * PPC_LINUX_PT_FPR0 + 8 * i;
+ get_frame_saved_regs (fi)[FP0_REGNUM + i] = regs_addr + 4 * PPC_LINUX_PT_FPR0 + 8 * i;
}
else
rs6000_frame_init_saved_regs (fi);
ppc_linux_frame_chain (struct frame_info *thisframe)
{
/* Kernel properly constructs the frame chain for the handler */
- if (thisframe->signal_handler_caller)
- return read_memory_integer ((thisframe)->frame, 4);
+ if ((get_frame_type (thisframe) == SIGTRAMP_FRAME))
+ return read_memory_integer (get_frame_base (thisframe), 4);
else
return rs6000_frame_chain (thisframe);
}
*_push_arguments(). The same remarks hold for the methods below. */
set_gdbarch_frameless_function_invocation (gdbarch,
ppc_linux_frameless_function_invocation);
- set_gdbarch_frame_chain (gdbarch, ppc_linux_frame_chain);
- set_gdbarch_frame_saved_pc (gdbarch, ppc_linux_frame_saved_pc);
+ set_gdbarch_deprecated_frame_chain (gdbarch, ppc_linux_frame_chain);
+ set_gdbarch_deprecated_frame_saved_pc (gdbarch, ppc_linux_frame_saved_pc);
- set_gdbarch_frame_init_saved_regs (gdbarch,
+ set_gdbarch_deprecated_frame_init_saved_regs (gdbarch,
ppc_linux_frame_init_saved_regs);
- set_gdbarch_init_extra_frame_info (gdbarch,
+ set_gdbarch_deprecated_init_extra_frame_info (gdbarch,
ppc_linux_init_extra_frame_info);
set_gdbarch_memory_remove_breakpoint (gdbarch,
set_solib_svr4_fetch_link_map_offsets
(gdbarch, ppc_linux_svr4_fetch_link_map_offsets);
}
+
+ /* Shared library handling. */
+ set_gdbarch_in_solib_call_trampoline (gdbarch, in_plt_section);
+ set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
}
void
_initialize_ppc_linux_tdep (void)
{
- gdbarch_register_osabi (bfd_arch_powerpc, GDB_OSABI_LINUX,
+ gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_LINUX,
ppc_linux_init_abi);
add_core_fns (&ppc_linux_regset_core_fns);
}
projects / deliverable / binutils-gdb.git / blobdiff