summaryrefslogtreecommitdiff
path: root/arch/tile/kernel/single_step.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/tile/kernel/single_step.c')
-rw-r--r--arch/tile/kernel/single_step.c116
1 files changed, 63 insertions, 53 deletions
diff --git a/arch/tile/kernel/single_step.c b/arch/tile/kernel/single_step.c
index 27742e87e255..5ef2e9eae5c5 100644
--- a/arch/tile/kernel/single_step.c
+++ b/arch/tile/kernel/single_step.c
@@ -12,41 +12,30 @@
* more details.
*
* A code-rewriter that enables instruction single-stepping.
- * Derived from iLib's single-stepping code.
*/
-#ifndef __tilegx__ /* Hardware support for single step unavailable. */
-
-/* These functions are only used on the TILE platform */
+#include <linux/smp.h>
+#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/thread_info.h>
#include <linux/uaccess.h>
#include <linux/mman.h>
#include <linux/types.h>
#include <linux/err.h>
+#include <linux/prctl.h>
#include <asm/cacheflush.h>
+#include <asm/traps.h>
+#include <asm/uaccess.h>
#include <asm/unaligned.h>
#include <arch/abi.h>
+#include <arch/spr_def.h>
#include <arch/opcode.h>
-#define signExtend17(val) sign_extend((val), 17)
-#define TILE_X1_MASK (0xffffffffULL << 31)
-
-int unaligned_printk;
-static int __init setup_unaligned_printk(char *str)
-{
- long val;
- if (strict_strtol(str, 0, &val) != 0)
- return 0;
- unaligned_printk = val;
- pr_info("Printk for each unaligned data accesses is %s\n",
- unaligned_printk ? "enabled" : "disabled");
- return 1;
-}
-__setup("unaligned_printk=", setup_unaligned_printk);
+#ifndef __tilegx__ /* Hardware support for single step unavailable. */
-unsigned int unaligned_fixup_count;
+#define signExtend17(val) sign_extend((val), 17)
+#define TILE_X1_MASK (0xffffffffULL << 31)
enum mem_op {
MEMOP_NONE,
@@ -56,12 +45,13 @@ enum mem_op {
MEMOP_STORE_POSTINCR
};
-static inline tile_bundle_bits set_BrOff_X1(tile_bundle_bits n, s32 offset)
+static inline tilepro_bundle_bits set_BrOff_X1(tilepro_bundle_bits n,
+ s32 offset)
{
- tile_bundle_bits result;
+ tilepro_bundle_bits result;
/* mask out the old offset */
- tile_bundle_bits mask = create_BrOff_X1(-1);
+ tilepro_bundle_bits mask = create_BrOff_X1(-1);
result = n & (~mask);
/* or in the new offset */
@@ -70,10 +60,11 @@ static inline tile_bundle_bits set_BrOff_X1(tile_bundle_bits n, s32 offset)
return result;
}
-static inline tile_bundle_bits move_X1(tile_bundle_bits n, int dest, int src)
+static inline tilepro_bundle_bits move_X1(tilepro_bundle_bits n, int dest,
+ int src)
{
- tile_bundle_bits result;
- tile_bundle_bits op;
+ tilepro_bundle_bits result;
+ tilepro_bundle_bits op;
result = n & (~TILE_X1_MASK);
@@ -87,13 +78,13 @@ static inline tile_bundle_bits move_X1(tile_bundle_bits n, int dest, int src)
return result;
}
-static inline tile_bundle_bits nop_X1(tile_bundle_bits n)
+static inline tilepro_bundle_bits nop_X1(tilepro_bundle_bits n)
{
return move_X1(n, TREG_ZERO, TREG_ZERO);
}
-static inline tile_bundle_bits addi_X1(
- tile_bundle_bits n, int dest, int src, int imm)
+static inline tilepro_bundle_bits addi_X1(
+ tilepro_bundle_bits n, int dest, int src, int imm)
{
n &= ~TILE_X1_MASK;
@@ -107,15 +98,26 @@ static inline tile_bundle_bits addi_X1(
return n;
}
-static tile_bundle_bits rewrite_load_store_unaligned(
+static tilepro_bundle_bits rewrite_load_store_unaligned(
struct single_step_state *state,
- tile_bundle_bits bundle,
+ tilepro_bundle_bits bundle,
struct pt_regs *regs,
enum mem_op mem_op,
int size, int sign_ext)
{
unsigned char __user *addr;
int val_reg, addr_reg, err, val;
+ int align_ctl;
+
+ align_ctl = unaligned_fixup;
+ switch (task_thread_info(current)->align_ctl) {
+ case PR_UNALIGN_NOPRINT:
+ align_ctl = 1;
+ break;
+ case PR_UNALIGN_SIGBUS:
+ align_ctl = 0;
+ break;
+ }
/* Get address and value registers */
if (bundle & TILEPRO_BUNDLE_Y_ENCODING_MASK) {
@@ -160,7 +162,7 @@ static tile_bundle_bits rewrite_load_store_unaligned(
* tilepro hardware would be doing, if it could provide us with the
* actual bad address in an SPR, which it doesn't.
*/
- if (unaligned_fixup == 0) {
+ if (align_ctl == 0) {
siginfo_t info = {
.si_signo = SIGBUS,
.si_code = BUS_ADRALN,
@@ -209,14 +211,14 @@ static tile_bundle_bits rewrite_load_store_unaligned(
if (err) {
siginfo_t info = {
- .si_signo = SIGSEGV,
- .si_code = SEGV_MAPERR,
+ .si_signo = SIGBUS,
+ .si_code = BUS_ADRALN,
.si_addr = addr
};
- trace_unhandled_signal("segfault", regs,
- (unsigned long)addr, SIGSEGV);
+ trace_unhandled_signal("bad address for unaligned fixup", regs,
+ (unsigned long)addr, SIGBUS);
force_sig_info(info.si_signo, &info, current);
- return (tile_bundle_bits) 0;
+ return (tilepro_bundle_bits) 0;
}
if (unaligned_printk || unaligned_fixup_count == 0) {
@@ -285,7 +287,7 @@ void single_step_execve(void)
ti->step_state = NULL;
}
-/**
+/*
* single_step_once() - entry point when single stepping has been triggered.
* @regs: The machine register state
*
@@ -304,20 +306,31 @@ void single_step_execve(void)
*/
void single_step_once(struct pt_regs *regs)
{
- extern tile_bundle_bits __single_step_ill_insn;
- extern tile_bundle_bits __single_step_j_insn;
- extern tile_bundle_bits __single_step_addli_insn;
- extern tile_bundle_bits __single_step_auli_insn;
+ extern tilepro_bundle_bits __single_step_ill_insn;
+ extern tilepro_bundle_bits __single_step_j_insn;
+ extern tilepro_bundle_bits __single_step_addli_insn;
+ extern tilepro_bundle_bits __single_step_auli_insn;
struct thread_info *info = (void *)current_thread_info();
struct single_step_state *state = info->step_state;
int is_single_step = test_ti_thread_flag(info, TIF_SINGLESTEP);
- tile_bundle_bits __user *buffer, *pc;
- tile_bundle_bits bundle;
+ tilepro_bundle_bits __user *buffer, *pc;
+ tilepro_bundle_bits bundle;
int temp_reg;
int target_reg = TREG_LR;
int err;
enum mem_op mem_op = MEMOP_NONE;
int size = 0, sign_ext = 0; /* happy compiler */
+ int align_ctl;
+
+ align_ctl = unaligned_fixup;
+ switch (task_thread_info(current)->align_ctl) {
+ case PR_UNALIGN_NOPRINT:
+ align_ctl = 1;
+ break;
+ case PR_UNALIGN_SIGBUS:
+ align_ctl = 0;
+ break;
+ }
asm(
" .pushsection .rodata.single_step\n"
@@ -390,7 +403,7 @@ void single_step_once(struct pt_regs *regs)
if (regs->faultnum == INT_SWINT_1)
regs->pc -= 8;
- pc = (tile_bundle_bits __user *)(regs->pc);
+ pc = (tilepro_bundle_bits __user *)(regs->pc);
if (get_user(bundle, pc) != 0) {
pr_err("Couldn't read instruction at %p trying to step\n", pc);
return;
@@ -627,9 +640,9 @@ void single_step_once(struct pt_regs *regs)
/*
* Check if we need to rewrite an unaligned load/store.
- * Returning zero is a special value meaning we need to SIGSEGV.
+ * Returning zero is a special value meaning we generated a signal.
*/
- if (mem_op != MEMOP_NONE && unaligned_fixup >= 0) {
+ if (mem_op != MEMOP_NONE && align_ctl >= 0) {
bundle = rewrite_load_store_unaligned(state, bundle, regs,
mem_op, size, sign_ext);
if (bundle == 0)
@@ -668,9 +681,9 @@ void single_step_once(struct pt_regs *regs)
}
/* End with a jump back to the next instruction */
- delta = ((regs->pc + TILE_BUNDLE_SIZE_IN_BYTES) -
+ delta = ((regs->pc + TILEPRO_BUNDLE_SIZE_IN_BYTES) -
(unsigned long)buffer) >>
- TILE_LOG2_BUNDLE_ALIGNMENT_IN_BYTES;
+ TILEPRO_LOG2_BUNDLE_ALIGNMENT_IN_BYTES;
bundle = __single_step_j_insn;
bundle |= create_JOffLong_X1(delta);
err |= __put_user(bundle, buffer++);
@@ -698,9 +711,6 @@ void single_step_once(struct pt_regs *regs)
}
#else
-#include <linux/smp.h>
-#include <linux/ptrace.h>
-#include <arch/spr_def.h>
static DEFINE_PER_CPU(unsigned long, ss_saved_pc);
@@ -743,10 +753,10 @@ void gx_singlestep_handle(struct pt_regs *regs, int fault_num)
} else if ((*ss_pc != regs->pc) ||
(!(control & SPR_SINGLE_STEP_CONTROL_1__CANCELED_MASK))) {
- ptrace_notify(SIGTRAP);
control |= SPR_SINGLE_STEP_CONTROL_1__CANCELED_MASK;
control |= SPR_SINGLE_STEP_CONTROL_1__INHIBIT_MASK;
__insn_mtspr(SPR_SINGLE_STEP_CONTROL_K, control);
+ send_sigtrap(current, regs);
}
}
generated by cgit (git 2.34.1) at 2024-06-16 06:49:35 +0000