#include <linux/kernel.h>
#include <linux/string.h>
-
#include <asm/backtrace.h>
-
-#include <arch/chip.h>
-
#include <asm/opcode-tile.h>
+#include <arch/abi.h>
-
-#define TREG_SP 54
-#define TREG_LR 55
-
-
-#if TILE_CHIP >= 10
+#ifdef __tilegx__
#define tile_bundle_bits tilegx_bundle_bits
#define TILE_MAX_INSTRUCTIONS_PER_BUNDLE TILEGX_MAX_INSTRUCTIONS_PER_BUNDLE
#define TILE_BUNDLE_ALIGNMENT_IN_BYTES TILEGX_BUNDLE_ALIGNMENT_IN_BYTES
typedef int bt_int_reg_t;
#endif
-/** A decoded bundle used for backtracer analysis. */
+/* A decoded bundle used for backtracer analysis. */
struct BacktraceBundle {
tile_bundle_bits bits;
int num_insns;
};
-/* This implementation only makes sense for native tools. */
-/** Default function to read memory. */
-static bool bt_read_memory(void *result, VirtualAddress addr,
- unsigned int size, void *extra)
-{
- /* FIXME: this should do some horrible signal stuff to catch
- * SEGV cleanly and fail.
- *
- * Or else the caller should do the setjmp for efficiency.
- */
-
- memcpy(result, (const void *)addr, size);
- return true;
-}
-
-
-/** Locates an instruction inside the given bundle that
+/* Locates an instruction inside the given bundle that
* has the specified mnemonic, and whose first 'num_operands_to_match'
* operands exactly match those in 'operand_values'.
*/
return NULL;
}
-/** Does this bundle contain an 'iret' instruction? */
+/* Does this bundle contain an 'iret' instruction? */
static inline bool bt_has_iret(const struct BacktraceBundle *bundle)
{
return find_matching_insn(bundle, TILE_OPC_IRET, NULL, 0) != NULL;
}
-/** Does this bundle contain an 'addi sp, sp, OFFSET' or
+/* Does this bundle contain an 'addi sp, sp, OFFSET' or
* 'addli sp, sp, OFFSET' instruction, and if so, what is OFFSET?
*/
static bool bt_has_addi_sp(const struct BacktraceBundle *bundle, int *adjust)
find_matching_insn(bundle, TILE_OPC_ADDI, vals, 2);
if (insn == NULL)
insn = find_matching_insn(bundle, TILE_OPC_ADDLI, vals, 2);
-#if TILE_CHIP >= 10
+#ifdef __tilegx__
if (insn == NULL)
insn = find_matching_insn(bundle, TILEGX_OPC_ADDXLI, vals, 2);
if (insn == NULL)
return true;
}
-/** Does this bundle contain any 'info OP' or 'infol OP'
+/* Does this bundle contain any 'info OP' or 'infol OP'
* instruction, and if so, what are their OP? Note that OP is interpreted
* as an unsigned value by this code since that's what the caller wants.
* Returns the number of info ops found.
return num_ops;
}
-/** Does this bundle contain a jrp instruction, and if so, to which
+/* Does this bundle contain a jrp instruction, and if so, to which
* register is it jumping?
*/
static bool bt_has_jrp(const struct BacktraceBundle *bundle, int *target_reg)
return true;
}
-/** Does this bundle modify the specified register in any way? */
+/* Does this bundle modify the specified register in any way? */
static bool bt_modifies_reg(const struct BacktraceBundle *bundle, int reg)
{
int i, j;
return false;
}
-/** Does this bundle modify sp? */
+/* Does this bundle modify sp? */
static inline bool bt_modifies_sp(const struct BacktraceBundle *bundle)
{
return bt_modifies_reg(bundle, TREG_SP);
}
-/** Does this bundle modify lr? */
+/* Does this bundle modify lr? */
static inline bool bt_modifies_lr(const struct BacktraceBundle *bundle)
{
return bt_modifies_reg(bundle, TREG_LR);
}
-/** Does this bundle contain the instruction 'move fp, sp'? */
+/* Does this bundle contain the instruction 'move fp, sp'? */
static inline bool bt_has_move_r52_sp(const struct BacktraceBundle *bundle)
{
static const int vals[2] = { 52, TREG_SP };
return find_matching_insn(bundle, TILE_OPC_MOVE, vals, 2) != NULL;
}
-/** Does this bundle contain a store of lr to sp? */
+/* Does this bundle contain a store of lr to sp? */
static inline bool bt_has_sw_sp_lr(const struct BacktraceBundle *bundle)
{
static const int vals[2] = { TREG_SP, TREG_LR };
return find_matching_insn(bundle, OPCODE_STORE, vals, 2) != NULL;
}
-#if TILE_CHIP >= 10
-/** Track moveli values placed into registers. */
+#ifdef __tilegx__
+/* Track moveli values placed into registers. */
static inline void bt_update_moveli(const struct BacktraceBundle *bundle,
int moveli_args[])
{
}
}
-/** Does this bundle contain an 'add sp, sp, reg' instruction
+/* Does this bundle contain an 'add sp, sp, reg' instruction
* from a register that we saw a moveli into, and if so, what
* is the value in the register?
*/
}
#endif
-/** Locates the caller's PC and SP for a program starting at the
+/* Locates the caller's PC and SP for a program starting at the
* given address.
*/
static void find_caller_pc_and_caller_sp(CallerLocation *location,
- const VirtualAddress start_pc,
+ const unsigned long start_pc,
BacktraceMemoryReader read_memory_func,
void *read_memory_func_extra)
{
tile_bundle_bits prefetched_bundles[32];
int num_bundles_prefetched = 0;
int next_bundle = 0;
- VirtualAddress pc;
+ unsigned long pc;
-#if TILE_CHIP >= 10
+#ifdef __tilegx__
/* Naively try to track moveli values to support addx for -m32. */
int moveli_args[TILEGX_NUM_REGISTERS] = { 0 };
#endif
/* Weird; reserved value, ignore it. */
continue;
}
- if (info_operand & ENTRY_POINT_INFO_OP) {
- /* This info op is ignored by the backtracer. */
- continue;
- }
/* Skip info ops which are not in the
* "one_ago" mode we want right now.
if (!sp_determined) {
int adjust;
if (bt_has_addi_sp(&bundle, &adjust)
-#if TILE_CHIP >= 10
+#ifdef __tilegx__
|| bt_has_add_sp(&bundle, &adjust, moveli_args)
#endif
) {
}
}
-#if TILE_CHIP >= 10
+#ifdef __tilegx__
/* Track moveli arguments for -m32 mode. */
bt_update_moveli(&bundle, moveli_args);
#endif
}
}
+/* Initializes a backtracer to start from the given location.
+ *
+ * If the frame pointer cannot be determined it is set to -1.
+ *
+ * state: The state to be filled in.
+ * read_memory_func: A callback that reads memory.
+ * read_memory_func_extra: An arbitrary argument to read_memory_func.
+ * pc: The current PC.
+ * lr: The current value of the 'lr' register.
+ * sp: The current value of the 'sp' register.
+ * r52: The current value of the 'r52' register.
+ */
void backtrace_init(BacktraceIterator *state,
BacktraceMemoryReader read_memory_func,
void *read_memory_func_extra,
- VirtualAddress pc, VirtualAddress lr,
- VirtualAddress sp, VirtualAddress r52)
+ unsigned long pc, unsigned long lr,
+ unsigned long sp, unsigned long r52)
{
CallerLocation location;
- VirtualAddress fp, initial_frame_caller_pc;
-
- if (read_memory_func == NULL) {
- read_memory_func = bt_read_memory;
- }
+ unsigned long fp, initial_frame_caller_pc;
/* Find out where we are in the initial frame. */
find_caller_pc_and_caller_sp(&location, pc,
/* Handle the case where the register holds more bits than the VA. */
static bool valid_addr_reg(bt_int_reg_t reg)
{
- return ((VirtualAddress)reg == reg);
+ return ((unsigned long)reg == reg);
}
+/* Advances the backtracing state to the calling frame, returning
+ * true iff successful.
+ */
bool backtrace_next(BacktraceIterator *state)
{
- VirtualAddress next_fp, next_pc;
+ unsigned long next_fp, next_pc;
bt_int_reg_t next_frame[2];
if (state->fp == -1) {
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