static inline void spill_registers(void)
{
+#if defined(__XTENSA_WINDOWED_ABI__)
#if XCHAL_NUM_AREGS > 16
__asm__ __volatile__ (
" call8 1f\n"
" mov a12, a12\n"
: : : "memory");
#endif
+#endif
}
struct debug_table {
__XTENSA_HANDLER
.literal_position
+#ifdef SUPPORT_WINDOWED
/*
* Fast-handler for alloca exceptions
*
8: j _WindowUnderflow8
4: j _WindowUnderflow4
ENDPROC(fast_alloca)
+#endif
#ifdef CONFIG_USER_ABI_CALL0_PROBE
/*
* Note: We assume the stack pointer is EXC_TABLE_KSTK in the fixup handler.
*/
-#ifdef CONFIG_FAST_SYSCALL_SPILL_REGISTERS
+#if defined(CONFIG_FAST_SYSCALL_SPILL_REGISTERS) && \
+ defined(USER_SUPPORT_WINDOWED)
ENTRY(fast_syscall_spill_registers)
#endif
#ifdef CONFIG_VECTORS_ADDR
+#ifdef SUPPORT_WINDOWED
mem_reserve(__pa(&_WindowVectors_text_start),
__pa(&_WindowVectors_text_end));
+#endif
mem_reserve(__pa(&_DebugInterruptVector_text_start),
__pa(&_DebugInterruptVector_text_end));
unsigned int window[4];
};
-/*
+#if defined(USER_SUPPORT_WINDOWED)
+/*
* Flush register windows stored in pt_regs to stack.
* Returns 1 for errors.
*/
-int
+static int
flush_window_regs_user(struct pt_regs *regs)
{
const unsigned long ws = regs->windowstart;
errout:
return err;
}
+#else
+static int
+flush_window_regs_user(struct pt_regs *regs)
+{
+ return 0;
+}
+#endif
/*
* Note: We don't copy double exception 'regs', we have to finish double exc.
/* EXCCAUSE_INSTRUCTION_FETCH unhandled */
/* EXCCAUSE_LOAD_STORE_ERROR unhandled*/
{ EXCCAUSE_LEVEL1_INTERRUPT, 0, do_interrupt },
+#ifdef SUPPORT_WINDOWED
{ EXCCAUSE_ALLOCA, USER|KRNL, fast_alloca },
+#endif
/* EXCCAUSE_INTEGER_DIVIDE_BY_ZERO unhandled */
/* EXCCAUSE_PRIVILEGED unhandled */
#if XCHAL_UNALIGNED_LOAD_EXCEPTION || XCHAL_UNALIGNED_STORE_EXCEPTION
xsr a0, depc # get DEPC, save a0
+#ifdef SUPPORT_WINDOWED
movi a2, WINDOW_VECTORS_VADDR
_bltu a0, a2, .Lfixup
addi a2, a2, WINDOW_VECTORS_SIZE
l32i a0, a0, EXC_TABLE_FAST_USER
jx a0
+#else
+ j .Lfixup
+#endif
+
/*
* We only allow the ITLB miss exception if we are in kernel space.
* All other exceptions are unexpected and thus unrecoverable!
l32i a0, a0, EXC_TABLE_FAST_USER
jx a0
+#ifdef SUPPORT_WINDOWED
/*
* Restart window OVERFLOW exception.
* Currently:
rsr a0, depc
rotw -3
j 1b
+#endif
ENDPROC(_DoubleExceptionVector)
+#ifdef SUPPORT_WINDOWED
+
/*
* Fixup handler for TLB miss in double exception handler for window owerflow.
* We get here with windowbase set to the window that was being spilled and
ENDPROC(window_overflow_restore_a0_fixup)
+#endif
+
/*
* Debug interrupt vector
*
.section .WindowVectors.text, "ax"
+#ifdef SUPPORT_WINDOWED
+
/* 4-Register Window Overflow Vector (Handler) */
ENTRY_ALIGN64(_WindowOverflow4)
ENDPROC(_WindowUnderflow12)
+#endif
+
.text
. = ALIGN(PAGE_SIZE);
_vecbase = .;
+#ifdef SUPPORT_WINDOWED
SECTION_VECTOR2 (.WindowVectors.text, WINDOW_VECTORS_VADDR)
+#endif
#if XCHAL_EXCM_LEVEL >= 2
SECTION_VECTOR2 (.Level2InterruptVector.text, INTLEVEL2_VECTOR_VADDR)
#endif
__boot_reloc_table_start = ABSOLUTE(.);
#if !MERGED_VECTORS
+#ifdef SUPPORT_WINDOWED
RELOCATE_ENTRY(_WindowVectors_text,
.WindowVectors.text);
+#endif
#if XCHAL_EXCM_LEVEL >= 2
RELOCATE_ENTRY(_Level2InterruptVector_text,
.Level2InterruptVector.text);
#if !MERGED_VECTORS
/* The vectors are relocated to the real position at startup time */
+#ifdef SUPPORT_WINDOWED
SECTION_VECTOR4 (_WindowVectors_text,
.WindowVectors.text,
WINDOW_VECTORS_VADDR,
- .dummy)
+ LAST)
+#undef LAST
+#define LAST .WindowVectors.text
+#endif
SECTION_VECTOR4 (_DebugInterruptVector_text,
.DebugInterruptVector.text,
DEBUG_VECTOR_VADDR,
- .WindowVectors.text)
+ LAST)
#undef LAST
#define LAST .DebugInterruptVector.text
#if XCHAL_EXCM_LEVEL >= 2