/* DWARF2 exception handling and frame unwind runtime interface routines.
- Copyright (C) 1997-2013 Free Software Foundation, Inc.
+ Copyright (C) 1997-2018 Free Software Foundation, Inc.
This file is part of GCC.
#ifndef __USING_SJLJ_EXCEPTIONS__
-#ifndef STACK_GROWS_DOWNWARD
-#define STACK_GROWS_DOWNWARD 0
+#ifndef __LIBGCC_STACK_GROWS_DOWNWARD__
+#define __LIBGCC_STACK_GROWS_DOWNWARD__ 0
#else
-#undef STACK_GROWS_DOWNWARD
-#define STACK_GROWS_DOWNWARD 1
+#undef __LIBGCC_STACK_GROWS_DOWNWARD__
+#define __LIBGCC_STACK_GROWS_DOWNWARD__ 1
#endif
/* Dwarf frame registers used for pre gcc 3.0 compiled glibc. */
#ifndef PRE_GCC3_DWARF_FRAME_REGISTERS
-#define PRE_GCC3_DWARF_FRAME_REGISTERS DWARF_FRAME_REGISTERS
-#endif
-
-#ifndef DWARF_REG_TO_UNWIND_COLUMN
-#define DWARF_REG_TO_UNWIND_COLUMN(REGNO) (REGNO)
+#define PRE_GCC3_DWARF_FRAME_REGISTERS __LIBGCC_DWARF_FRAME_REGISTERS__
#endif
/* ??? For the public function interfaces, we tend to gcc_assert that the
ignore unwind data for unknown columns. */
#define UNWIND_COLUMN_IN_RANGE(x) \
- __builtin_expect((x) <= DWARF_FRAME_REGISTERS, 1)
+ __builtin_expect((x) <= __LIBGCC_DWARF_FRAME_REGISTERS__, 1)
#ifdef REG_VALUE_IN_UNWIND_CONTEXT
typedef _Unwind_Word _Unwind_Context_Reg_Val;
to its caller. */
struct _Unwind_Context
{
- _Unwind_Context_Reg_Val reg[DWARF_FRAME_REGISTERS+1];
+ _Unwind_Context_Reg_Val reg[__LIBGCC_DWARF_FRAME_REGISTERS__+1];
void *cfa;
void *ra;
void *lsda;
#define SIGNAL_FRAME_BIT ((~(_Unwind_Word) 0 >> 1) + 1)
/* Context which has version/args_size/by_value fields. */
#define EXTENDED_CONTEXT_BIT ((~(_Unwind_Word) 0 >> 2) + 1)
+ /* Bit reserved on AArch64, return address has been signed with A key. */
+#define RA_A_SIGNED_BIT ((~(_Unwind_Word) 0 >> 3) + 1)
_Unwind_Word flags;
/* 0 for now, can be increased when further fields are added to
struct _Unwind_Context. */
_Unwind_Word version;
_Unwind_Word args_size;
- char by_value[DWARF_FRAME_REGISTERS+1];
+ char by_value[__LIBGCC_DWARF_FRAME_REGISTERS__+1];
};
/* Byte size of every register managed by these routines. */
-static unsigned char dwarf_reg_size_table[DWARF_FRAME_REGISTERS+1];
+static unsigned char dwarf_reg_size_table[__LIBGCC_DWARF_FRAME_REGISTERS__+1];
\f
/* Read unaligned data from the instruction buffer. */
|| (context->flags & EXTENDED_CONTEXT_BIT));
}
\f
-/* Get the value of register INDEX as saved in CONTEXT. */
+/* Get the value of register REGNO as saved in CONTEXT. */
inline _Unwind_Word
-_Unwind_GetGR (struct _Unwind_Context *context, int index)
+_Unwind_GetGR (struct _Unwind_Context *context, int regno)
{
- int size;
+ int size, index;
_Unwind_Context_Reg_Val val;
#ifdef DWARF_ZERO_REG
return 0;
#endif
- index = DWARF_REG_TO_UNWIND_COLUMN (index);
+ index = DWARF_REG_TO_UNWIND_COLUMN (regno);
gcc_assert (index < (int) sizeof(dwarf_reg_size_table));
size = dwarf_reg_size_table[index];
val = context->reg[index];
if (_Unwind_IsExtendedContext (context) && context->by_value[index])
return _Unwind_Get_Unwind_Word (val);
+#ifdef DWARF_LAZY_REGISTER_VALUE
+ {
+ _Unwind_Word value;
+ if (DWARF_LAZY_REGISTER_VALUE (regno, &value))
+ return value;
+ }
+#endif
+
/* This will segfault if the register hasn't been saved. */
if (size == sizeof(_Unwind_Ptr))
return * (_Unwind_Ptr *) (_Unwind_Internal_Ptr) val;
break;
case DW_CFA_GNU_window_save:
+#if defined (__aarch64__) && !defined (__ILP32__)
+ /* This CFA is multiplexed with Sparc. On AArch64 it's used to toggle
+ return address signing status. */
+ fs->regs.reg[DWARF_REGNUM_AARCH64_RA_STATE].loc.offset ^= 1;
+#else
/* ??? Hardcoded for SPARC register window configuration. */
- if (DWARF_FRAME_REGISTERS >= 32)
+ if (__LIBGCC_DWARF_FRAME_REGISTERS__ >= 32)
for (reg = 16; reg < 32; ++reg)
{
fs->regs.reg[reg].how = REG_SAVED_OFFSET;
fs->regs.reg[reg].loc.offset = (reg - 16) * sizeof (void *);
}
+#endif
break;
case DW_CFA_GNU_args_size:
void *cfa;
long i;
-#ifdef EH_RETURN_STACKADJ_RTX
+#ifdef __LIBGCC_EH_RETURN_STACKADJ_RTX__
/* Special handling here: Many machines do not use a frame pointer,
and track the CFA only through offsets from the stack pointer from
one frame to the next. In this case, the stack pointer is never
context->cfa = cfa;
/* Compute the addresses of all registers saved in this frame. */
- for (i = 0; i < DWARF_FRAME_REGISTERS + 1; ++i)
+ for (i = 0; i < __LIBGCC_DWARF_FRAME_REGISTERS__ + 1; ++i)
switch (fs->regs.reg[i].how)
{
case REG_UNSAVED:
stack frame. */
context->ra = 0;
else
- /* Compute the return address now, since the return address column
- can change from frame to frame. */
- context->ra = __builtin_extract_return_addr
- (_Unwind_GetPtr (context, fs->retaddr_column));
+ {
+ /* Compute the return address now, since the return address column
+ can change from frame to frame. */
+ context->ra = __builtin_extract_return_addr
+ (_Unwind_GetPtr (context, fs->retaddr_column));
+#ifdef MD_POST_EXTRACT_FRAME_ADDR
+ context->ra = MD_POST_EXTRACT_FRAME_ADDR (context, fs, context->ra);
+#endif
+ }
}
static void
void *outer_cfa, void *outer_ra)
{
void *ra = __builtin_extract_return_addr (__builtin_return_address (0));
+#ifdef MD_POST_EXTRACT_ROOT_ADDR
+ ra = MD_POST_EXTRACT_ROOT_ADDR (ra);
+#endif
_Unwind_FrameState fs;
_Unwind_SpTmp sp_slot;
_Unwind_Reason_Code code;
initialization context, then we can't see it in the given
call frame data. So have the initialization context tell us. */
context->ra = __builtin_extract_return_addr (outer_ra);
+#ifdef MD_POST_EXTRACT_ROOT_ADDR
+ context->ra = MD_POST_EXTRACT_ROOT_ADDR (context->ra);
+#endif
}
static void _Unwind_DebugHook (void *, void *)
#endif
}
+/* Frob exception handler's address kept in TARGET before installing into
+ CURRENT context. */
+
+static inline void *
+uw_frob_return_addr (struct _Unwind_Context *current
+ __attribute__ ((__unused__)),
+ struct _Unwind_Context *target)
+{
+ void *ret_addr = __builtin_frob_return_addr (target->ra);
+#ifdef MD_POST_FROB_EH_HANDLER_ADDR
+ ret_addr = MD_POST_FROB_EH_HANDLER_ADDR (current, target, ret_addr);
+#endif
+ return ret_addr;
+}
+
/* Install TARGET into CURRENT so that we can return to it. This is a
macro because __builtin_eh_return must be invoked in the context of
- our caller. */
+ our caller. FRAMES is a number of frames to be unwind.
+ _Unwind_Frames_Extra is a macro to do additional work during unwinding
+ if needed, for example shadow stack pointer adjustment for Intel CET
+ technology. */
-#define uw_install_context(CURRENT, TARGET) \
+#define uw_install_context(CURRENT, TARGET, FRAMES) \
do \
{ \
long offset = uw_install_context_1 ((CURRENT), (TARGET)); \
- void *handler = __builtin_frob_return_addr ((TARGET)->ra); \
+ void *handler = uw_frob_return_addr ((CURRENT), (TARGET)); \
_Unwind_DebugHook ((TARGET)->cfa, handler); \
+ _Unwind_Frames_Extra (FRAMES); \
__builtin_eh_return (offset, handler); \
} \
while (0)
if (!_Unwind_GetGRPtr (target, __builtin_dwarf_sp_column ()))
_Unwind_SetSpColumn (target, target->cfa, &sp_slot);
- for (i = 0; i < DWARF_FRAME_REGISTERS; ++i)
+ for (i = 0; i < __LIBGCC_DWARF_FRAME_REGISTERS__; ++i)
{
void *c = (void *) (_Unwind_Internal_Ptr) current->reg[i];
void *t = (void *) (_Unwind_Internal_Ptr)target->reg[i];
target_cfa = _Unwind_GetPtr (target, __builtin_dwarf_sp_column ());
/* We adjust SP by the difference between CURRENT and TARGET's CFA. */
- if (STACK_GROWS_DOWNWARD)
+ if (__LIBGCC_STACK_GROWS_DOWNWARD__)
return target_cfa - current->cfa + target->args_size;
else
return current->cfa - target_cfa - target->args_size;
/* The CFA is not sufficient to disambiguate the context of a function
interrupted by a signal before establishing its frame and the context
of the signal itself. */
- if (STACK_GROWS_DOWNWARD)
+ if (__LIBGCC_STACK_GROWS_DOWNWARD__)
return _Unwind_GetCFA (context) - _Unwind_IsSignalFrame (context);
else
return _Unwind_GetCFA (context) + _Unwind_IsSignalFrame (context);
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