aboutsummaryrefslogtreecommitdiff
path: root/arch/xtensa/kernel
diff options
context:
space:
mode:
Diffstat (limited to 'arch/xtensa/kernel')
-rw-r--r--arch/xtensa/kernel/Makefile21
-rw-r--r--arch/xtensa/kernel/traps.c16
-rw-r--r--arch/xtensa/kernel/vmlinux.lds.S4
3 files changed, 33 insertions, 8 deletions
diff --git a/arch/xtensa/kernel/Makefile b/arch/xtensa/kernel/Makefile
index 7419dbccf02..fe3186de6a3 100644
--- a/arch/xtensa/kernel/Makefile
+++ b/arch/xtensa/kernel/Makefile
@@ -4,15 +4,30 @@
extra-y := head.o vmlinux.lds
-
obj-y := align.o entry.o irq.o coprocessor.o process.o ptrace.o \
setup.o signal.o syscall.o time.o traps.o vectors.o platform.o \
pci-dma.o init_task.o io.o
-## windowspill.o
-
obj-$(CONFIG_KGDB) += xtensa-stub.o
obj-$(CONFIG_PCI) += pci.o
obj-$(CONFIG_MODULES) += xtensa_ksyms.o module.o
+# In the Xtensa architecture, assembly generates literals which must always
+# precede the L32R instruction with a relative offset less than 256 kB.
+# Therefore, the .text and .literal section must be combined in parenthesis
+# in the linker script, such as: *(.literal .text).
+#
+# We need to post-process the generated vmlinux.lds scripts to convert
+# *(xxx.text) to *(xxx.literal xxx.text) for the following text sections:
+# .text .ref.text .*init.text .*exit.text .text.*
+#
+# Replicate rules in scripts/Makefile.build
+
+sed-y = -e 's/(\(\.[a-z]*it\|\.ref\|\)\.text)/(\1.literal \1.text)/g' \
+ -e 's/(\(\.text\.[a-z]*\))/(\1.literal \1)/g'
+
+quiet_cmd__cpp_lds_S = LDS $@
+ cmd__cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ $< | sed $(sed-y) >$@
+$(obj)/vmlinux.lds: $(src)/vmlinux.lds.S FORCE
+ $(call if_changed_dep,_cpp_lds_S)
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index 9f0b71189e9..ba9ab934978 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -369,6 +369,18 @@ void show_regs(struct pt_regs * regs)
regs->syscall);
}
+static __always_inline unsigned long *stack_pointer(struct task_struct *task)
+{
+ unsigned long *sp;
+
+ if (!task || task == current)
+ __asm__ __volatile__ ("mov %0, a1\n" : "=a"(sp));
+ else
+ sp = (unsigned long *)task->thread.sp;
+
+ return sp;
+}
+
void show_trace(struct task_struct *task, unsigned long *sp)
{
unsigned long a0, a1, pc;
@@ -377,7 +389,7 @@ void show_trace(struct task_struct *task, unsigned long *sp)
if (sp)
a1 = (unsigned long)sp;
else
- a1 = task->thread.sp;
+ a1 = (unsigned long)stack_pointer(task);
sp_start = a1 & ~(THREAD_SIZE-1);
sp_end = sp_start + THREAD_SIZE;
@@ -420,7 +432,7 @@ void show_stack(struct task_struct *task, unsigned long *sp)
unsigned long *stack;
if (!sp)
- sp = (unsigned long *)task->thread.sp;
+ sp = stack_pointer(task);
stack = sp;
printk("\nStack: ");
diff --git a/arch/xtensa/kernel/vmlinux.lds.S b/arch/xtensa/kernel/vmlinux.lds.S
index 5accf51053d..41c159cd872 100644
--- a/arch/xtensa/kernel/vmlinux.lds.S
+++ b/arch/xtensa/kernel/vmlinux.lds.S
@@ -87,7 +87,7 @@ SECTIONS
{
/* The HEAD_TEXT section must be the first section! */
HEAD_TEXT
- *(.literal .text)
+ TEXT_TEXT
VMLINUX_SYMBOL(__sched_text_start) = .;
*(.sched.literal .sched.text)
VMLINUX_SYMBOL(__sched_text_end) = .;
@@ -139,8 +139,6 @@ SECTIONS
__init_begin = .;
.init.text : {
_sinittext = .;
- *(.init.literal) *(.cpuinit.literal)
- *(.devinit.literal) *(.meminit.literal)
INIT_TEXT
_einittext = .;
}