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-rw-r--r--arch/arm/kernel/calls.S1
-rw-r--r--arch/arm/kernel/entry-common.S124
-rw-r--r--arch/arm/kernel/etm.c4
-rw-r--r--arch/arm/kernel/kgdb.c126
-rw-r--r--arch/arm/kernel/module.c34
-rw-r--r--arch/arm/kernel/perf_event.c18
-rw-r--r--arch/arm/kernel/sys_arm.c14
-rw-r--r--arch/arm/kernel/sys_oabi-compat.c6
8 files changed, 221 insertions, 106 deletions
diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
index 37ae301..afeb71f 100644
--- a/arch/arm/kernel/calls.S
+++ b/arch/arm/kernel/calls.S
@@ -375,6 +375,7 @@
CALL(sys_rt_tgsigqueueinfo)
CALL(sys_perf_event_open)
/* 365 */ CALL(sys_recvmmsg)
+ CALL(sys_accept4)
#ifndef syscalls_counted
.equ syscalls_padding, ((NR_syscalls + 3) & ~3) - NR_syscalls
#define syscalls_counted
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 2c1db77..f05a35a 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -92,75 +92,111 @@ ENDPROC(ret_from_fork)
#define CALL(x) .long x
#ifdef CONFIG_FUNCTION_TRACER
+/*
+ * When compiling with -pg, gcc inserts a call to the mcount routine at the
+ * start of every function. In mcount, apart from the function's address (in
+ * lr), we need to get hold of the function's caller's address.
+ *
+ * Older GCCs (pre-4.4) inserted a call to a routine called mcount like this:
+ *
+ * bl mcount
+ *
+ * These versions have the limitation that in order for the mcount routine to
+ * be able to determine the function's caller's address, an APCS-style frame
+ * pointer (which is set up with something like the code below) is required.
+ *
+ * mov ip, sp
+ * push {fp, ip, lr, pc}
+ * sub fp, ip, #4
+ *
+ * With EABI, these frame pointers are not available unless -mapcs-frame is
+ * specified, and if building as Thumb-2, not even then.
+ *
+ * Newer GCCs (4.4+) solve this problem by introducing a new version of mcount,
+ * with call sites like:
+ *
+ * push {lr}
+ * bl __gnu_mcount_nc
+ *
+ * With these compilers, frame pointers are not necessary.
+ *
+ * mcount can be thought of as a function called in the middle of a subroutine
+ * call. As such, it needs to be transparent for both the caller and the
+ * callee: the original lr needs to be restored when leaving mcount, and no
+ * registers should be clobbered. (In the __gnu_mcount_nc implementation, we
+ * clobber the ip register. This is OK because the ARM calling convention
+ * allows it to be clobbered in subroutines and doesn't use it to hold
+ * parameters.)
+ */
#ifdef CONFIG_DYNAMIC_FTRACE
ENTRY(mcount)
- stmdb sp!, {r0-r3, lr}
- mov r0, lr
- sub r0, r0, #MCOUNT_INSN_SIZE
+ stmdb sp!, {r0-r3, lr}
+ mov r0, lr
+ sub r0, r0, #MCOUNT_INSN_SIZE
.globl mcount_call
mcount_call:
- bl ftrace_stub
- ldr lr, [fp, #-4] @ restore lr
- ldmia sp!, {r0-r3, pc}
+ bl ftrace_stub
+ ldr lr, [fp, #-4] @ restore lr
+ ldmia sp!, {r0-r3, pc}
ENTRY(ftrace_caller)
- stmdb sp!, {r0-r3, lr}
- ldr r1, [fp, #-4]
- mov r0, lr
- sub r0, r0, #MCOUNT_INSN_SIZE
+ stmdb sp!, {r0-r3, lr}
+ ldr r1, [fp, #-4]
+ mov r0, lr
+ sub r0, r0, #MCOUNT_INSN_SIZE
.globl ftrace_call
ftrace_call:
- bl ftrace_stub
- ldr lr, [fp, #-4] @ restore lr
- ldmia sp!, {r0-r3, pc}
+ bl ftrace_stub
+ ldr lr, [fp, #-4] @ restore lr
+ ldmia sp!, {r0-r3, pc}
#else
ENTRY(__gnu_mcount_nc)
- stmdb sp!, {r0-r3, lr}
- ldr r0, =ftrace_trace_function
- ldr r2, [r0]
- adr r0, ftrace_stub
- cmp r0, r2
- bne gnu_trace
- ldmia sp!, {r0-r3, ip, lr}
- mov pc, ip
+ stmdb sp!, {r0-r3, lr}
+ ldr r0, =ftrace_trace_function
+ ldr r2, [r0]
+ adr r0, ftrace_stub
+ cmp r0, r2
+ bne gnu_trace
+ ldmia sp!, {r0-r3, ip, lr}
+ mov pc, ip
gnu_trace:
- ldr r1, [sp, #20] @ lr of instrumented routine
- mov r0, lr
- sub r0, r0, #MCOUNT_INSN_SIZE
- mov lr, pc
- mov pc, r2
- ldmia sp!, {r0-r3, ip, lr}
- mov pc, ip
+ ldr r1, [sp, #20] @ lr of instrumented routine
+ mov r0, lr
+ sub r0, r0, #MCOUNT_INSN_SIZE
+ mov lr, pc
+ mov pc, r2
+ ldmia sp!, {r0-r3, ip, lr}
+ mov pc, ip
ENTRY(mcount)
- stmdb sp!, {r0-r3, lr}
- ldr r0, =ftrace_trace_function
- ldr r2, [r0]
- adr r0, ftrace_stub
- cmp r0, r2
- bne trace
- ldr lr, [fp, #-4] @ restore lr
- ldmia sp!, {r0-r3, pc}
+ stmdb sp!, {r0-r3, lr}
+ ldr r0, =ftrace_trace_function
+ ldr r2, [r0]
+ adr r0, ftrace_stub
+ cmp r0, r2
+ bne trace
+ ldr lr, [fp, #-4] @ restore lr
+ ldmia sp!, {r0-r3, pc}
trace:
- ldr r1, [fp, #-4] @ lr of instrumented routine
- mov r0, lr
- sub r0, r0, #MCOUNT_INSN_SIZE
- mov lr, pc
- mov pc, r2
- ldr lr, [fp, #-4] @ restore lr
- ldmia sp!, {r0-r3, pc}
+ ldr r1, [fp, #-4] @ lr of instrumented routine
+ mov r0, lr
+ sub r0, r0, #MCOUNT_INSN_SIZE
+ mov lr, pc
+ mov pc, r2
+ ldr lr, [fp, #-4] @ restore lr
+ ldmia sp!, {r0-r3, pc}
#endif /* CONFIG_DYNAMIC_FTRACE */
.globl ftrace_stub
ftrace_stub:
- mov pc, lr
+ mov pc, lr
#endif /* CONFIG_FUNCTION_TRACER */
diff --git a/arch/arm/kernel/etm.c b/arch/arm/kernel/etm.c
index 8277539..56418f9 100644
--- a/arch/arm/kernel/etm.c
+++ b/arch/arm/kernel/etm.c
@@ -543,7 +543,9 @@ static int __init etm_probe(struct amba_device *dev, struct amba_id *id)
t->etm_portsz = 1;
etm_unlock(t);
- ret = etm_readl(t, CSCR_PRSR);
+ (void)etm_readl(t, ETMMR_PDSR);
+ /* dummy first read */
+ (void)etm_readl(&tracer, ETMMR_OSSRR);
t->ncmppairs = etm_readl(t, ETMR_CONFCODE) & 0xf;
etm_writel(t, 0x440, ETMR_CTRL);
diff --git a/arch/arm/kernel/kgdb.c b/arch/arm/kernel/kgdb.c
index c868a88..d6e8b4d 100644
--- a/arch/arm/kernel/kgdb.c
+++ b/arch/arm/kernel/kgdb.c
@@ -10,57 +10,62 @@
* Deepak Saxena <dsaxena@plexity.net>
*/
#include <linux/irq.h>
+#include <linux/kdebug.h>
#include <linux/kgdb.h>
#include <asm/traps.h>
-/* Make a local copy of the registers passed into the handler (bletch) */
-void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs)
+struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
{
- int regno;
-
- /* Initialize all to zero. */
- for (regno = 0; regno < GDB_MAX_REGS; regno++)
- gdb_regs[regno] = 0;
+ { "r0", 4, offsetof(struct pt_regs, ARM_r0)},
+ { "r1", 4, offsetof(struct pt_regs, ARM_r1)},
+ { "r2", 4, offsetof(struct pt_regs, ARM_r2)},
+ { "r3", 4, offsetof(struct pt_regs, ARM_r3)},
+ { "r4", 4, offsetof(struct pt_regs, ARM_r4)},
+ { "r5", 4, offsetof(struct pt_regs, ARM_r5)},
+ { "r6", 4, offsetof(struct pt_regs, ARM_r6)},
+ { "r7", 4, offsetof(struct pt_regs, ARM_r7)},
+ { "r8", 4, offsetof(struct pt_regs, ARM_r8)},
+ { "r9", 4, offsetof(struct pt_regs, ARM_r9)},
+ { "r10", 4, offsetof(struct pt_regs, ARM_r10)},
+ { "fp", 4, offsetof(struct pt_regs, ARM_fp)},
+ { "ip", 4, offsetof(struct pt_regs, ARM_ip)},
+ { "sp", 4, offsetof(struct pt_regs, ARM_sp)},
+ { "lr", 4, offsetof(struct pt_regs, ARM_lr)},
+ { "pc", 4, offsetof(struct pt_regs, ARM_pc)},
+ { "f0", 12, -1 },
+ { "f1", 12, -1 },
+ { "f2", 12, -1 },
+ { "f3", 12, -1 },
+ { "f4", 12, -1 },
+ { "f5", 12, -1 },
+ { "f6", 12, -1 },
+ { "f7", 12, -1 },
+ { "fps", 4, -1 },
+ { "cpsr", 4, offsetof(struct pt_regs, ARM_cpsr)},
+};
- gdb_regs[_R0] = kernel_regs->ARM_r0;
- gdb_regs[_R1] = kernel_regs->ARM_r1;
- gdb_regs[_R2] = kernel_regs->ARM_r2;
- gdb_regs[_R3] = kernel_regs->ARM_r3;
- gdb_regs[_R4] = kernel_regs->ARM_r4;
- gdb_regs[_R5] = kernel_regs->ARM_r5;
- gdb_regs[_R6] = kernel_regs->ARM_r6;
- gdb_regs[_R7] = kernel_regs->ARM_r7;
- gdb_regs[_R8] = kernel_regs->ARM_r8;
- gdb_regs[_R9] = kernel_regs->ARM_r9;
- gdb_regs[_R10] = kernel_regs->ARM_r10;
- gdb_regs[_FP] = kernel_regs->ARM_fp;
- gdb_regs[_IP] = kernel_regs->ARM_ip;
- gdb_regs[_SPT] = kernel_regs->ARM_sp;
- gdb_regs[_LR] = kernel_regs->ARM_lr;
- gdb_regs[_PC] = kernel_regs->ARM_pc;
- gdb_regs[_CPSR] = kernel_regs->ARM_cpsr;
+char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
+{
+ if (regno >= DBG_MAX_REG_NUM || regno < 0)
+ return NULL;
+
+ if (dbg_reg_def[regno].offset != -1)
+ memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
+ dbg_reg_def[regno].size);
+ else
+ memset(mem, 0, dbg_reg_def[regno].size);
+ return dbg_reg_def[regno].name;
}
-/* Copy local gdb registers back to kgdb regs, for later copy to kernel */
-void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs)
+int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
{
- kernel_regs->ARM_r0 = gdb_regs[_R0];
- kernel_regs->ARM_r1 = gdb_regs[_R1];
- kernel_regs->ARM_r2 = gdb_regs[_R2];
- kernel_regs->ARM_r3 = gdb_regs[_R3];
- kernel_regs->ARM_r4 = gdb_regs[_R4];
- kernel_regs->ARM_r5 = gdb_regs[_R5];
- kernel_regs->ARM_r6 = gdb_regs[_R6];
- kernel_regs->ARM_r7 = gdb_regs[_R7];
- kernel_regs->ARM_r8 = gdb_regs[_R8];
- kernel_regs->ARM_r9 = gdb_regs[_R9];
- kernel_regs->ARM_r10 = gdb_regs[_R10];
- kernel_regs->ARM_fp = gdb_regs[_FP];
- kernel_regs->ARM_ip = gdb_regs[_IP];
- kernel_regs->ARM_sp = gdb_regs[_SPT];
- kernel_regs->ARM_lr = gdb_regs[_LR];
- kernel_regs->ARM_pc = gdb_regs[_PC];
- kernel_regs->ARM_cpsr = gdb_regs[_CPSR];
+ if (regno >= DBG_MAX_REG_NUM || regno < 0)
+ return -EINVAL;
+
+ if (dbg_reg_def[regno].offset != -1)
+ memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
+ dbg_reg_def[regno].size);
+ return 0;
}
void
@@ -74,7 +79,7 @@ sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task)
return;
/* Initialize to zero */
- for (regno = 0; regno < GDB_MAX_REGS; regno++)
+ for (regno = 0; regno < DBG_MAX_REG_NUM; regno++)
gdb_regs[regno] = 0;
/* Otherwise, we have only some registers from switch_to() */
@@ -176,6 +181,33 @@ void kgdb_roundup_cpus(unsigned long flags)
local_irq_disable();
}
+static int __kgdb_notify(struct die_args *args, unsigned long cmd)
+{
+ struct pt_regs *regs = args->regs;
+
+ if (kgdb_handle_exception(1, args->signr, cmd, regs))
+ return NOTIFY_DONE;
+ return NOTIFY_STOP;
+}
+static int
+kgdb_notify(struct notifier_block *self, unsigned long cmd, void *ptr)
+{
+ unsigned long flags;
+ int ret;
+
+ local_irq_save(flags);
+ ret = __kgdb_notify(ptr, cmd);
+ local_irq_restore(flags);
+
+ return ret;
+}
+
+static struct notifier_block kgdb_notifier = {
+ .notifier_call = kgdb_notify,
+ .priority = -INT_MAX,
+};
+
+
/**
* kgdb_arch_init - Perform any architecture specific initalization.
*
@@ -184,6 +216,11 @@ void kgdb_roundup_cpus(unsigned long flags)
*/
int kgdb_arch_init(void)
{
+ int ret = register_die_notifier(&kgdb_notifier);
+
+ if (ret != 0)
+ return ret;
+
register_undef_hook(&kgdb_brkpt_hook);
register_undef_hook(&kgdb_compiled_brkpt_hook);
@@ -200,6 +237,7 @@ void kgdb_arch_exit(void)
{
unregister_undef_hook(&kgdb_brkpt_hook);
unregister_undef_hook(&kgdb_compiled_brkpt_hook);
+ unregister_die_notifier(&kgdb_notifier);
}
/*
diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c
index c628bdf..6b46058 100644
--- a/arch/arm/kernel/module.c
+++ b/arch/arm/kernel/module.c
@@ -102,7 +102,9 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
unsigned long loc;
Elf32_Sym *sym;
s32 offset;
+#ifdef CONFIG_THUMB2_KERNEL
u32 upper, lower, sign, j1, j2;
+#endif
offset = ELF32_R_SYM(rel->r_info);
if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) {
@@ -185,6 +187,7 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
(offset & 0x0fff);
break;
+#ifdef CONFIG_THUMB2_KERNEL
case R_ARM_THM_CALL:
case R_ARM_THM_JUMP24:
upper = *(u16 *)loc;
@@ -233,9 +236,40 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
*(u16 *)(loc + 2) = (u16)((lower & 0xd000) |
(j1 << 13) | (j2 << 11) |
((offset >> 1) & 0x07ff));
+ break;
+
+ case R_ARM_THM_MOVW_ABS_NC:
+ case R_ARM_THM_MOVT_ABS:
upper = *(u16 *)loc;
lower = *(u16 *)(loc + 2);
+
+ /*
+ * MOVT/MOVW instructions encoding in Thumb-2:
+ *
+ * i = upper[10]
+ * imm4 = upper[3:0]
+ * imm3 = lower[14:12]
+ * imm8 = lower[7:0]
+ *
+ * imm16 = imm4:i:imm3:imm8
+ */
+ offset = ((upper & 0x000f) << 12) |
+ ((upper & 0x0400) << 1) |
+ ((lower & 0x7000) >> 4) | (lower & 0x00ff);
+ offset = (offset ^ 0x8000) - 0x8000;
+ offset += sym->st_value;
+
+ if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_ABS)
+ offset >>= 16;
+
+ *(u16 *)loc = (u16)((upper & 0xfbf0) |
+ ((offset & 0xf000) >> 12) |
+ ((offset & 0x0800) >> 1));
+ *(u16 *)(loc + 2) = (u16)((lower & 0x8f00) |
+ ((offset & 0x0700) << 4) |
+ (offset & 0x00ff));
break;
+#endif
default:
printk(KERN_ERR "%s: unknown relocation: %u\n",
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index de12536..417c392 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -164,20 +164,20 @@ armpmu_event_set_period(struct perf_event *event,
struct hw_perf_event *hwc,
int idx)
{
- s64 left = atomic64_read(&hwc->period_left);
+ s64 left = local64_read(&hwc->period_left);
s64 period = hwc->sample_period;
int ret = 0;
if (unlikely(left <= -period)) {
left = period;
- atomic64_set(&hwc->period_left, left);
+ local64_set(&hwc->period_left, left);
hwc->last_period = period;
ret = 1;
}
if (unlikely(left <= 0)) {
left += period;
- atomic64_set(&hwc->period_left, left);
+ local64_set(&hwc->period_left, left);
hwc->last_period = period;
ret = 1;
}
@@ -185,7 +185,7 @@ armpmu_event_set_period(struct perf_event *event,
if (left > (s64)armpmu->max_period)
left = armpmu->max_period;
- atomic64_set(&hwc->prev_count, (u64)-left);
+ local64_set(&hwc->prev_count, (u64)-left);
armpmu->write_counter(idx, (u64)(-left) & 0xffffffff);
@@ -204,18 +204,18 @@ armpmu_event_update(struct perf_event *event,
u64 delta;
again:
- prev_raw_count = atomic64_read(&hwc->prev_count);
+ prev_raw_count = local64_read(&hwc->prev_count);
new_raw_count = armpmu->read_counter(idx);
- if (atomic64_cmpxchg(&hwc->prev_count, prev_raw_count,
+ if (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
new_raw_count) != prev_raw_count)
goto again;
delta = (new_raw_count << shift) - (prev_raw_count << shift);
delta >>= shift;
- atomic64_add(delta, &event->count);
- atomic64_sub(delta, &hwc->period_left);
+ local64_add(delta, &event->count);
+ local64_sub(delta, &hwc->period_left);
return new_raw_count;
}
@@ -478,7 +478,7 @@ __hw_perf_event_init(struct perf_event *event)
if (!hwc->sample_period) {
hwc->sample_period = armpmu->max_period;
hwc->last_period = hwc->sample_period;
- atomic64_set(&hwc->period_left, hwc->sample_period);
+ local64_set(&hwc->period_left, hwc->sample_period);
}
err = 0;
diff --git a/arch/arm/kernel/sys_arm.c b/arch/arm/kernel/sys_arm.c
index c235018..62e7c61 100644
--- a/arch/arm/kernel/sys_arm.c
+++ b/arch/arm/kernel/sys_arm.c
@@ -62,8 +62,9 @@ asmlinkage int sys_vfork(struct pt_regs *regs)
/* sys_execve() executes a new program.
* This is called indirectly via a small wrapper
*/
-asmlinkage int sys_execve(char __user *filenamei, char __user * __user *argv,
- char __user * __user *envp, struct pt_regs *regs)
+asmlinkage int sys_execve(const char __user *filenamei,
+ const char __user *const __user *argv,
+ const char __user *const __user *envp, struct pt_regs *regs)
{
int error;
char * filename;
@@ -78,14 +79,17 @@ out:
return error;
}
-int kernel_execve(const char *filename, char *const argv[], char *const envp[])
+int kernel_execve(const char *filename,
+ const char *const argv[],
+ const char *const envp[])
{
struct pt_regs regs;
int ret;
memset(&regs, 0, sizeof(struct pt_regs));
- ret = do_execve((char *)filename, (char __user * __user *)argv,
- (char __user * __user *)envp, &regs);
+ ret = do_execve(filename,
+ (const char __user *const __user *)argv,
+ (const char __user *const __user *)envp, &regs);
if (ret < 0)
goto out;
diff --git a/arch/arm/kernel/sys_oabi-compat.c b/arch/arm/kernel/sys_oabi-compat.c
index 33ff678..4ad8da1 100644
--- a/arch/arm/kernel/sys_oabi-compat.c
+++ b/arch/arm/kernel/sys_oabi-compat.c
@@ -141,7 +141,7 @@ static long cp_oldabi_stat64(struct kstat *stat,
return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
}
-asmlinkage long sys_oabi_stat64(char __user * filename,
+asmlinkage long sys_oabi_stat64(const char __user * filename,
struct oldabi_stat64 __user * statbuf)
{
struct kstat stat;
@@ -151,7 +151,7 @@ asmlinkage long sys_oabi_stat64(char __user * filename,
return error;
}
-asmlinkage long sys_oabi_lstat64(char __user * filename,
+asmlinkage long sys_oabi_lstat64(const char __user * filename,
struct oldabi_stat64 __user * statbuf)
{
struct kstat stat;
@@ -172,7 +172,7 @@ asmlinkage long sys_oabi_fstat64(unsigned long fd,
}
asmlinkage long sys_oabi_fstatat64(int dfd,
- char __user *filename,
+ const char __user *filename,
struct oldabi_stat64 __user *statbuf,
int flag)
{
generated by cgit v0.10.2 at 2024-09-18 15:13:26 (GMT)