#include <arch/chip.h>
-#if TILE_CHIP < 10
-
-
#include <asm/opcode-tile.h>
#define TREG_LR 55
+#if TILE_CHIP >= 10
+#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
+#define tile_decoded_instruction tilegx_decoded_instruction
+#define tile_mnemonic tilegx_mnemonic
+#define parse_insn_tile parse_insn_tilegx
+#define TILE_OPC_IRET TILEGX_OPC_IRET
+#define TILE_OPC_ADDI TILEGX_OPC_ADDI
+#define TILE_OPC_ADDLI TILEGX_OPC_ADDLI
+#define TILE_OPC_INFO TILEGX_OPC_INFO
+#define TILE_OPC_INFOL TILEGX_OPC_INFOL
+#define TILE_OPC_JRP TILEGX_OPC_JRP
+#define TILE_OPC_MOVE TILEGX_OPC_MOVE
+#define OPCODE_STORE TILEGX_OPC_ST
+typedef long long bt_int_reg_t;
+#else
+#define OPCODE_STORE TILE_OPC_SW
+typedef int bt_int_reg_t;
+#endif
+
/** A decoded bundle used for backtracer analysis. */
-typedef struct {
+struct BacktraceBundle {
tile_bundle_bits bits;
int num_insns;
struct tile_decoded_instruction
insns[TILE_MAX_INSTRUCTIONS_PER_BUNDLE];
-} BacktraceBundle;
+};
/* This implementation only makes sense for native tools. */
/** Default function to read memory. */
-static bool
-bt_read_memory(void *result, VirtualAddress addr, size_t size, void *extra)
+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.
* has the specified mnemonic, and whose first 'num_operands_to_match'
* operands exactly match those in 'operand_values'.
*/
-static const struct tile_decoded_instruction*
-find_matching_insn(const BacktraceBundle *bundle,
- tile_mnemonic mnemonic,
- const int *operand_values,
- int num_operands_to_match)
+static const struct tile_decoded_instruction *find_matching_insn(
+ const struct BacktraceBundle *bundle,
+ tile_mnemonic mnemonic,
+ const int *operand_values,
+ int num_operands_to_match)
{
int i, j;
bool match;
}
/** Does this bundle contain an 'iret' instruction? */
-static inline bool
-bt_has_iret(const BacktraceBundle *bundle)
+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
* 'addli sp, sp, OFFSET' instruction, and if so, what is OFFSET?
*/
-static bool
-bt_has_addi_sp(const BacktraceBundle *bundle, int *adjust)
+static bool bt_has_addi_sp(const struct BacktraceBundle *bundle, int *adjust)
{
static const int vals[2] = { TREG_SP, TREG_SP };
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
+ if (insn == NULL)
+ insn = find_matching_insn(bundle, TILEGX_OPC_ADDXLI, vals, 2);
+ if (insn == NULL)
+ insn = find_matching_insn(bundle, TILEGX_OPC_ADDXI, vals, 2);
+#endif
if (insn == NULL)
return false;
* as an unsigned value by this code since that's what the caller wants.
* Returns the number of info ops found.
*/
-static int
-bt_get_info_ops(const BacktraceBundle *bundle,
+static int bt_get_info_ops(const struct BacktraceBundle *bundle,
int operands[MAX_INFO_OPS_PER_BUNDLE])
{
int num_ops = 0;
/** Does this bundle contain a jrp instruction, and if so, to which
* register is it jumping?
*/
-static bool
-bt_has_jrp(const BacktraceBundle *bundle, int *target_reg)
+static bool bt_has_jrp(const struct BacktraceBundle *bundle, int *target_reg)
{
const struct tile_decoded_instruction *insn =
find_matching_insn(bundle, TILE_OPC_JRP, NULL, 0);
}
/** Does this bundle modify the specified register in any way? */
-static bool
-bt_modifies_reg(const BacktraceBundle *bundle, int reg)
+static bool bt_modifies_reg(const struct BacktraceBundle *bundle, int reg)
{
int i, j;
for (i = 0; i < bundle->num_insns; i++) {
}
/** Does this bundle modify sp? */
-static inline bool
-bt_modifies_sp(const BacktraceBundle *bundle)
+static inline bool bt_modifies_sp(const struct BacktraceBundle *bundle)
{
return bt_modifies_reg(bundle, TREG_SP);
}
/** Does this bundle modify lr? */
-static inline bool
-bt_modifies_lr(const BacktraceBundle *bundle)
+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'? */
-static inline bool
-bt_has_move_r52_sp(const BacktraceBundle *bundle)
+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 the instruction 'sw sp, lr'? */
-static inline bool
-bt_has_sw_sp_lr(const BacktraceBundle *bundle)
+/** 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, TILE_OPC_SW, vals, 2) != NULL;
+ return find_matching_insn(bundle, OPCODE_STORE, vals, 2) != NULL;
+}
+
+#if TILE_CHIP >= 10
+/** Track moveli values placed into registers. */
+static inline void bt_update_moveli(const struct BacktraceBundle *bundle,
+ int moveli_args[])
+{
+ int i;
+ for (i = 0; i < bundle->num_insns; i++) {
+ const struct tile_decoded_instruction *insn =
+ &bundle->insns[i];
+
+ if (insn->opcode->mnemonic == TILEGX_OPC_MOVELI) {
+ int reg = insn->operand_values[0];
+ moveli_args[reg] = insn->operand_values[1];
+ }
+ }
+}
+
+/** 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?
+ */
+static bool bt_has_add_sp(const struct BacktraceBundle *bundle, int *adjust,
+ int moveli_args[])
+{
+ static const int vals[2] = { TREG_SP, TREG_SP };
+
+ const struct tile_decoded_instruction *insn =
+ find_matching_insn(bundle, TILEGX_OPC_ADDX, vals, 2);
+ if (insn) {
+ int reg = insn->operand_values[2];
+ if (moveli_args[reg]) {
+ *adjust = moveli_args[reg];
+ return true;
+ }
+ }
+ return false;
}
+#endif
/** 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,
- BacktraceMemoryReader read_memory_func,
- void *read_memory_func_extra)
+static void find_caller_pc_and_caller_sp(CallerLocation *location,
+ const VirtualAddress start_pc,
+ BacktraceMemoryReader read_memory_func,
+ void *read_memory_func_extra)
{
/* Have we explicitly decided what the sp is,
* rather than just the default?
int next_bundle = 0;
VirtualAddress pc;
+#if TILE_CHIP >= 10
+ /* Naively try to track moveli values to support addx for -m32. */
+ int moveli_args[TILEGX_NUM_REGISTERS] = { 0 };
+#endif
+
/* Default to assuming that the caller's sp is the current sp.
* This is necessary to handle the case where we start backtracing
* right at the end of the epilog.
for (pc = start_pc;; pc += sizeof(tile_bundle_bits)) {
- BacktraceBundle bundle;
+ struct BacktraceBundle bundle;
int num_info_ops, info_operands[MAX_INFO_OPS_PER_BUNDLE];
int one_ago, jrp_reg;
bool has_jrp;
if (!sp_determined) {
int adjust;
- if (bt_has_addi_sp(&bundle, &adjust)) {
+ if (bt_has_addi_sp(&bundle, &adjust)
+#if TILE_CHIP >= 10
+ || bt_has_add_sp(&bundle, &adjust, moveli_args)
+#endif
+ ) {
location->sp_location = SP_LOC_OFFSET;
if (adjust <= 0) {
sp_determined = true;
}
}
+
+#if TILE_CHIP >= 10
+ /* Track moveli arguments for -m32 mode. */
+ bt_update_moveli(&bundle, moveli_args);
+#endif
}
if (bt_has_iret(&bundle)) {
}
}
-void
-backtrace_init(BacktraceIterator *state,
- BacktraceMemoryReader read_memory_func,
- void *read_memory_func_extra,
- VirtualAddress pc, VirtualAddress lr,
- VirtualAddress sp, VirtualAddress r52)
+void backtrace_init(BacktraceIterator *state,
+ BacktraceMemoryReader read_memory_func,
+ void *read_memory_func_extra,
+ VirtualAddress pc, VirtualAddress lr,
+ VirtualAddress sp, VirtualAddress r52)
{
CallerLocation location;
VirtualAddress fp, initial_frame_caller_pc;
break;
}
- /* The frame pointer should theoretically be aligned mod 8. If
- * it's not even aligned mod 4 then something terrible happened
- * and we should mark it as invalid.
+ /* If the frame pointer is not aligned to the basic word size
+ * something terrible happened and we should mark it as invalid.
*/
- if (fp % 4 != 0)
+ if (fp % sizeof(bt_int_reg_t) != 0)
fp = -1;
/* -1 means "don't know initial_frame_caller_pc". */
state->read_memory_func_extra = read_memory_func_extra;
}
-bool
-backtrace_next(BacktraceIterator *state)
+/* Handle the case where the register holds more bits than the VA. */
+static bool valid_addr_reg(bt_int_reg_t reg)
{
- VirtualAddress next_fp, next_pc, next_frame[2];
+ return ((VirtualAddress)reg == reg);
+}
+
+bool backtrace_next(BacktraceIterator *state)
+{
+ VirtualAddress next_fp, next_pc;
+ bt_int_reg_t next_frame[2];
if (state->fp == -1) {
/* No parent frame. */
}
next_fp = next_frame[1];
- if (next_fp % 4 != 0) {
- /* Caller's frame pointer is suspect, so give up.
- * Technically it should be aligned mod 8, but we will
- * be forgiving here.
- */
+ if (!valid_addr_reg(next_frame[1]) ||
+ next_fp % sizeof(bt_int_reg_t) != 0) {
+ /* Caller's frame pointer is suspect, so give up. */
return false;
}
} else {
/* Get the caller PC from the frame linkage area. */
next_pc = next_frame[0];
- if (next_pc == 0 ||
+ if (!valid_addr_reg(next_frame[0]) || next_pc == 0 ||
next_pc % TILE_BUNDLE_ALIGNMENT_IN_BYTES != 0) {
/* The PC is suspect, so give up. */
return false;
return true;
}
-
-#else /* TILE_CHIP < 10 */
-
-void
-backtrace_init(BacktraceIterator *state,
- BacktraceMemoryReader read_memory_func,
- void *read_memory_func_extra,
- VirtualAddress pc, VirtualAddress lr,
- VirtualAddress sp, VirtualAddress r52)
-{
- state->pc = pc;
- state->sp = sp;
- state->fp = -1;
- state->initial_frame_caller_pc = -1;
- state->read_memory_func = read_memory_func;
- state->read_memory_func_extra = read_memory_func_extra;
-}
-
-bool backtrace_next(BacktraceIterator *state) { return false; }
-
-#endif /* TILE_CHIP < 10 */
git.openpandora.org / pandora-kernel.git / blobdiff