xtensa: build kernel with text-section-literals
vmlinux.lds.S doesn't do anything special with literals, so instead of keeping them separate put them into the corresponding text sections. Drop explicit .literal sections from the vmlinux.lds.S, use standard section macros. Mark literal pool locations in the assembly sources. Unfortunately assembler doesn't put literals into .init sections and external libgcc may still have .literal sections, so sed transformation to the linker script is still needed. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
parent
7bf5234db7
commit
f8f02ca73c
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@ -42,12 +42,12 @@ export PLATFORM
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# temporarily until string.h is fixed
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# temporarily until string.h is fixed
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KBUILD_CFLAGS += -ffreestanding -D__linux__
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KBUILD_CFLAGS += -ffreestanding -D__linux__
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KBUILD_CFLAGS += -pipe -mlongcalls -mtext-section-literals
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KBUILD_CFLAGS += -pipe -mlongcalls
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KBUILD_CFLAGS += $(call cc-option,-mforce-no-pic,)
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KBUILD_CFLAGS += $(call cc-option,-mforce-no-pic,)
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KBUILD_CFLAGS += $(call cc-option,-mno-serialize-volatile,)
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KBUILD_CFLAGS += $(call cc-option,-mno-serialize-volatile,)
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KBUILD_AFLAGS += -mlongcalls -mtext-section-literals
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ifneq ($(CONFIG_LD_NO_RELAX),)
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ifneq ($(CONFIG_LD_NO_RELAX),)
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LDFLAGS := --no-relax
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LDFLAGS := --no-relax
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endif
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endif
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@ -42,6 +42,7 @@ __start_a0:
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.align 4
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.align 4
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.section .text, "ax"
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.section .text, "ax"
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.literal_position
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.begin literal_prefix .text
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.begin literal_prefix .text
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/* put literals in here! */
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/* put literals in here! */
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@ -17,9 +17,6 @@ obj-$(CONFIG_XTENSA_VARIANT_HAVE_PERF_EVENTS) += perf_event.o
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obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
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obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
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obj-$(CONFIG_S32C1I_SELFTEST) += s32c1i_selftest.o
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obj-$(CONFIG_S32C1I_SELFTEST) += s32c1i_selftest.o
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AFLAGS_head.o += -mtext-section-literals
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AFLAGS_mxhead.o += -mtext-section-literals
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# In the Xtensa architecture, assembly generates literals which must always
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# In the Xtensa architecture, assembly generates literals which must always
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# precede the L32R instruction with a relative offset less than 256 kB.
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# precede the L32R instruction with a relative offset less than 256 kB.
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# Therefore, the .text and .literal section must be combined in parenthesis
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# Therefore, the .text and .literal section must be combined in parenthesis
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@ -155,7 +155,7 @@
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* < VALID_DOUBLE_EXCEPTION_ADDRESS: regular exception
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* < VALID_DOUBLE_EXCEPTION_ADDRESS: regular exception
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*/
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*/
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.literal_position
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ENTRY(fast_unaligned)
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ENTRY(fast_unaligned)
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/* Note: We don't expect the address to be aligned on a word
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/* Note: We don't expect the address to be aligned on a word
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@ -125,6 +125,7 @@
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*
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*
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* Note: _user_exception might be at an odd address. Don't use call0..call12
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* Note: _user_exception might be at an odd address. Don't use call0..call12
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*/
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*/
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.literal_position
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ENTRY(user_exception)
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ENTRY(user_exception)
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@ -777,6 +778,8 @@ ENDPROC(kernel_exception)
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* When we get here, a0 is trashed and saved to excsave[debuglevel]
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* When we get here, a0 is trashed and saved to excsave[debuglevel]
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*/
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*/
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.literal_position
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ENTRY(debug_exception)
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ENTRY(debug_exception)
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rsr a0, SREG_EPS + XCHAL_DEBUGLEVEL
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rsr a0, SREG_EPS + XCHAL_DEBUGLEVEL
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@ -916,6 +919,8 @@ ENDPROC(debug_exception)
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unrecoverable_text:
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unrecoverable_text:
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.ascii "Unrecoverable error in exception handler\0"
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.ascii "Unrecoverable error in exception handler\0"
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.literal_position
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ENTRY(unrecoverable_exception)
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ENTRY(unrecoverable_exception)
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movi a0, 1
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movi a0, 1
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@ -1117,6 +1122,8 @@ ENDPROC(fast_syscall_unrecoverable)
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* j done
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* j done
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*/
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*/
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.literal_position
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#ifdef CONFIG_FAST_SYSCALL_XTENSA
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#ifdef CONFIG_FAST_SYSCALL_XTENSA
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#define TRY \
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#define TRY \
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@ -1887,6 +1894,7 @@ ENDPROC(fast_store_prohibited)
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* void system_call (struct pt_regs* regs, int exccause)
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* void system_call (struct pt_regs* regs, int exccause)
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* a2 a3
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* a2 a3
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*/
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*/
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.literal_position
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ENTRY(system_call)
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ENTRY(system_call)
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@ -277,13 +277,13 @@ extern char _end[];
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extern char _stext[];
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extern char _stext[];
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extern char _WindowVectors_text_start;
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extern char _WindowVectors_text_start;
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extern char _WindowVectors_text_end;
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extern char _WindowVectors_text_end;
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extern char _DebugInterruptVector_literal_start;
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extern char _DebugInterruptVector_text_start;
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extern char _DebugInterruptVector_text_end;
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extern char _DebugInterruptVector_text_end;
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extern char _KernelExceptionVector_literal_start;
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extern char _KernelExceptionVector_text_start;
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extern char _KernelExceptionVector_text_end;
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extern char _KernelExceptionVector_text_end;
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extern char _UserExceptionVector_literal_start;
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extern char _UserExceptionVector_text_start;
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extern char _UserExceptionVector_text_end;
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extern char _UserExceptionVector_text_end;
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extern char _DoubleExceptionVector_literal_start;
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extern char _DoubleExceptionVector_text_start;
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extern char _DoubleExceptionVector_text_end;
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extern char _DoubleExceptionVector_text_end;
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#if XCHAL_EXCM_LEVEL >= 2
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#if XCHAL_EXCM_LEVEL >= 2
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extern char _Level2InterruptVector_text_start;
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extern char _Level2InterruptVector_text_start;
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@ -339,16 +339,16 @@ void __init setup_arch(char **cmdline_p)
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mem_reserve(__pa(&_WindowVectors_text_start),
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mem_reserve(__pa(&_WindowVectors_text_start),
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__pa(&_WindowVectors_text_end));
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__pa(&_WindowVectors_text_end));
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mem_reserve(__pa(&_DebugInterruptVector_literal_start),
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mem_reserve(__pa(&_DebugInterruptVector_text_start),
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__pa(&_DebugInterruptVector_text_end));
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__pa(&_DebugInterruptVector_text_end));
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mem_reserve(__pa(&_KernelExceptionVector_literal_start),
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mem_reserve(__pa(&_KernelExceptionVector_text_start),
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__pa(&_KernelExceptionVector_text_end));
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__pa(&_KernelExceptionVector_text_end));
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mem_reserve(__pa(&_UserExceptionVector_literal_start),
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mem_reserve(__pa(&_UserExceptionVector_text_start),
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__pa(&_UserExceptionVector_text_end));
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__pa(&_UserExceptionVector_text_end));
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mem_reserve(__pa(&_DoubleExceptionVector_literal_start),
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mem_reserve(__pa(&_DoubleExceptionVector_text_start),
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__pa(&_DoubleExceptionVector_text_end));
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__pa(&_DoubleExceptionVector_text_end));
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#if XCHAL_EXCM_LEVEL >= 2
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#if XCHAL_EXCM_LEVEL >= 2
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@ -205,9 +205,6 @@ ENDPROC(_KernelExceptionVector)
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*/
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*/
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.section .DoubleExceptionVector.text, "ax"
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.section .DoubleExceptionVector.text, "ax"
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.begin literal_prefix .DoubleExceptionVector
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.globl _DoubleExceptionVector_WindowUnderflow
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.globl _DoubleExceptionVector_WindowOverflow
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ENTRY(_DoubleExceptionVector)
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ENTRY(_DoubleExceptionVector)
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@ -217,8 +214,12 @@ ENTRY(_DoubleExceptionVector)
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/* Check for kernel double exception (usually fatal). */
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/* Check for kernel double exception (usually fatal). */
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rsr a2, ps
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rsr a2, ps
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_bbci.l a2, PS_UM_BIT, .Lksp
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_bbsi.l a2, PS_UM_BIT, 1f
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j .Lksp
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.align 4
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.literal_position
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1:
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/* Check if we are currently handling a window exception. */
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/* Check if we are currently handling a window exception. */
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/* Note: We don't need to indicate that we enter a critical section. */
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/* Note: We don't need to indicate that we enter a critical section. */
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@ -475,11 +476,8 @@ _DoubleExceptionVector_handle_exception:
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rotw -3
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rotw -3
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j 1b
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j 1b
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ENDPROC(_DoubleExceptionVector)
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ENDPROC(_DoubleExceptionVector)
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.end literal_prefix
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.text
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.text
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/*
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/*
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* Fixup handler for TLB miss in double exception handler for window owerflow.
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* Fixup handler for TLB miss in double exception handler for window owerflow.
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@ -508,6 +506,8 @@ ENDPROC(_DoubleExceptionVector)
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* a3: exctable, original value in excsave1
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* a3: exctable, original value in excsave1
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*/
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*/
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.literal_position
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ENTRY(window_overflow_restore_a0_fixup)
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ENTRY(window_overflow_restore_a0_fixup)
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rsr a0, ps
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rsr a0, ps
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LONG(sym ## _end); \
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LONG(sym ## _end); \
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LONG(LOADADDR(section))
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LONG(LOADADDR(section))
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/* Macro to define a section for a vector.
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/*
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*
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* Macro to define a section for a vector. When CONFIG_VECTORS_OFFSET is
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* Use of the MIN function catches the types of errors illustrated in
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* defined code for every vector is located with other init data. At startup
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* the following example:
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* time head.S copies code for every vector to its final position according
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*
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* to description recorded in the corresponding RELOCATE_ENTRY.
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* Assume the section .DoubleExceptionVector.literal is completely
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* full. Then a programmer adds code to .DoubleExceptionVector.text
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* that produces another literal. The final literal position will
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* overlay onto the first word of the adjacent code section
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* .DoubleExceptionVector.text. (In practice, the literals will
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* overwrite the code, and the first few instructions will be
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* garbage.)
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*/
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*/
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#ifdef CONFIG_VECTORS_OFFSET
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#ifdef CONFIG_VECTORS_OFFSET
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#define SECTION_VECTOR(sym, section, addr, max_prevsec_size, prevsec) \
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#define SECTION_VECTOR(sym, section, addr, prevsec) \
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section addr : AT((MIN(LOADADDR(prevsec) + max_prevsec_size, \
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section addr : AT(((LOADADDR(prevsec) + SIZEOF(prevsec)) + 3) & ~ 3) \
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LOADADDR(prevsec) + SIZEOF(prevsec)) + 3) & ~ 3) \
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{ \
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{ \
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. = ALIGN(4); \
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. = ALIGN(4); \
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sym ## _start = ABSOLUTE(.); \
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sym ## _start = ABSOLUTE(.); \
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@ -112,26 +104,19 @@ SECTIONS
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#if XCHAL_EXCM_LEVEL >= 6
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#if XCHAL_EXCM_LEVEL >= 6
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SECTION_VECTOR (.Level6InterruptVector.text, INTLEVEL6_VECTOR_VADDR)
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SECTION_VECTOR (.Level6InterruptVector.text, INTLEVEL6_VECTOR_VADDR)
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#endif
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#endif
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SECTION_VECTOR (.DebugInterruptVector.literal, DEBUG_VECTOR_VADDR - 4)
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SECTION_VECTOR (.DebugInterruptVector.text, DEBUG_VECTOR_VADDR)
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SECTION_VECTOR (.DebugInterruptVector.text, DEBUG_VECTOR_VADDR)
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SECTION_VECTOR (.KernelExceptionVector.literal, KERNEL_VECTOR_VADDR - 4)
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SECTION_VECTOR (.KernelExceptionVector.text, KERNEL_VECTOR_VADDR)
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SECTION_VECTOR (.KernelExceptionVector.text, KERNEL_VECTOR_VADDR)
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SECTION_VECTOR (.UserExceptionVector.literal, USER_VECTOR_VADDR - 4)
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SECTION_VECTOR (.UserExceptionVector.text, USER_VECTOR_VADDR)
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SECTION_VECTOR (.UserExceptionVector.text, USER_VECTOR_VADDR)
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SECTION_VECTOR (.DoubleExceptionVector.literal, DOUBLEEXC_VECTOR_VADDR - 20)
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SECTION_VECTOR (.DoubleExceptionVector.text, DOUBLEEXC_VECTOR_VADDR)
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SECTION_VECTOR (.DoubleExceptionVector.text, DOUBLEEXC_VECTOR_VADDR)
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#endif
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#endif
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IRQENTRY_TEXT
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SOFTIRQENTRY_TEXT
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ENTRY_TEXT
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TEXT_TEXT
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TEXT_TEXT
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VMLINUX_SYMBOL(__sched_text_start) = .;
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SCHED_TEXT
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*(.sched.literal .sched.text)
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CPUIDLE_TEXT
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VMLINUX_SYMBOL(__sched_text_end) = .;
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LOCK_TEXT
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VMLINUX_SYMBOL(__cpuidle_text_start) = .;
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*(.cpuidle.literal .cpuidle.text)
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VMLINUX_SYMBOL(__cpuidle_text_end) = .;
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VMLINUX_SYMBOL(__lock_text_start) = .;
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*(.spinlock.literal .spinlock.text)
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VMLINUX_SYMBOL(__lock_text_end) = .;
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}
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}
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_etext = .;
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_etext = .;
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@ -196,8 +181,6 @@ SECTIONS
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.KernelExceptionVector.text);
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.KernelExceptionVector.text);
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RELOCATE_ENTRY(_UserExceptionVector_text,
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RELOCATE_ENTRY(_UserExceptionVector_text,
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.UserExceptionVector.text);
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.UserExceptionVector.text);
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RELOCATE_ENTRY(_DoubleExceptionVector_literal,
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.DoubleExceptionVector.literal);
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RELOCATE_ENTRY(_DoubleExceptionVector_text,
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RELOCATE_ENTRY(_DoubleExceptionVector_text,
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.DoubleExceptionVector.text);
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.DoubleExceptionVector.text);
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RELOCATE_ENTRY(_DebugInterruptVector_text,
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RELOCATE_ENTRY(_DebugInterruptVector_text,
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@ -230,25 +213,19 @@ SECTIONS
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SECTION_VECTOR (_WindowVectors_text,
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SECTION_VECTOR (_WindowVectors_text,
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.WindowVectors.text,
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.WindowVectors.text,
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WINDOW_VECTORS_VADDR, 4,
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WINDOW_VECTORS_VADDR,
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.dummy)
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.dummy)
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SECTION_VECTOR (_DebugInterruptVector_literal,
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.DebugInterruptVector.literal,
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DEBUG_VECTOR_VADDR - 4,
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SIZEOF(.WindowVectors.text),
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.WindowVectors.text)
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SECTION_VECTOR (_DebugInterruptVector_text,
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SECTION_VECTOR (_DebugInterruptVector_text,
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.DebugInterruptVector.text,
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.DebugInterruptVector.text,
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DEBUG_VECTOR_VADDR,
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DEBUG_VECTOR_VADDR,
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4,
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.WindowVectors.text)
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.DebugInterruptVector.literal)
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#undef LAST
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#undef LAST
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#define LAST .DebugInterruptVector.text
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#define LAST .DebugInterruptVector.text
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#if XCHAL_EXCM_LEVEL >= 2
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#if XCHAL_EXCM_LEVEL >= 2
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SECTION_VECTOR (_Level2InterruptVector_text,
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SECTION_VECTOR (_Level2InterruptVector_text,
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.Level2InterruptVector.text,
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.Level2InterruptVector.text,
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INTLEVEL2_VECTOR_VADDR,
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INTLEVEL2_VECTOR_VADDR,
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SIZEOF(LAST), LAST)
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LAST)
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# undef LAST
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# undef LAST
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# define LAST .Level2InterruptVector.text
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# define LAST .Level2InterruptVector.text
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#endif
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#endif
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@ -256,7 +233,7 @@ SECTIONS
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SECTION_VECTOR (_Level3InterruptVector_text,
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SECTION_VECTOR (_Level3InterruptVector_text,
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.Level3InterruptVector.text,
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.Level3InterruptVector.text,
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INTLEVEL3_VECTOR_VADDR,
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INTLEVEL3_VECTOR_VADDR,
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SIZEOF(LAST), LAST)
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LAST)
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# undef LAST
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# undef LAST
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# define LAST .Level3InterruptVector.text
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# define LAST .Level3InterruptVector.text
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#endif
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#endif
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@ -264,7 +241,7 @@ SECTIONS
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SECTION_VECTOR (_Level4InterruptVector_text,
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SECTION_VECTOR (_Level4InterruptVector_text,
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.Level4InterruptVector.text,
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.Level4InterruptVector.text,
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INTLEVEL4_VECTOR_VADDR,
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INTLEVEL4_VECTOR_VADDR,
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SIZEOF(LAST), LAST)
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LAST)
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# undef LAST
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# undef LAST
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# define LAST .Level4InterruptVector.text
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# define LAST .Level4InterruptVector.text
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#endif
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#endif
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@ -272,7 +249,7 @@ SECTIONS
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SECTION_VECTOR (_Level5InterruptVector_text,
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SECTION_VECTOR (_Level5InterruptVector_text,
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.Level5InterruptVector.text,
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.Level5InterruptVector.text,
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INTLEVEL5_VECTOR_VADDR,
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INTLEVEL5_VECTOR_VADDR,
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SIZEOF(LAST), LAST)
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LAST)
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# undef LAST
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# undef LAST
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# define LAST .Level5InterruptVector.text
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# define LAST .Level5InterruptVector.text
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#endif
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#endif
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@ -280,40 +257,23 @@ SECTIONS
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SECTION_VECTOR (_Level6InterruptVector_text,
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SECTION_VECTOR (_Level6InterruptVector_text,
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.Level6InterruptVector.text,
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.Level6InterruptVector.text,
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INTLEVEL6_VECTOR_VADDR,
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INTLEVEL6_VECTOR_VADDR,
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SIZEOF(LAST), LAST)
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LAST)
|
||||||
# undef LAST
|
# undef LAST
|
||||||
# define LAST .Level6InterruptVector.text
|
# define LAST .Level6InterruptVector.text
|
||||||
#endif
|
#endif
|
||||||
SECTION_VECTOR (_KernelExceptionVector_literal,
|
|
||||||
.KernelExceptionVector.literal,
|
|
||||||
KERNEL_VECTOR_VADDR - 4,
|
|
||||||
SIZEOF(LAST), LAST)
|
|
||||||
#undef LAST
|
|
||||||
SECTION_VECTOR (_KernelExceptionVector_text,
|
SECTION_VECTOR (_KernelExceptionVector_text,
|
||||||
.KernelExceptionVector.text,
|
.KernelExceptionVector.text,
|
||||||
KERNEL_VECTOR_VADDR,
|
KERNEL_VECTOR_VADDR,
|
||||||
4,
|
LAST)
|
||||||
.KernelExceptionVector.literal)
|
#undef LAST
|
||||||
SECTION_VECTOR (_UserExceptionVector_literal,
|
|
||||||
.UserExceptionVector.literal,
|
|
||||||
USER_VECTOR_VADDR - 4,
|
|
||||||
SIZEOF(.KernelExceptionVector.text),
|
|
||||||
.KernelExceptionVector.text)
|
|
||||||
SECTION_VECTOR (_UserExceptionVector_text,
|
SECTION_VECTOR (_UserExceptionVector_text,
|
||||||
.UserExceptionVector.text,
|
.UserExceptionVector.text,
|
||||||
USER_VECTOR_VADDR,
|
USER_VECTOR_VADDR,
|
||||||
4,
|
.KernelExceptionVector.text)
|
||||||
.UserExceptionVector.literal)
|
|
||||||
SECTION_VECTOR (_DoubleExceptionVector_literal,
|
|
||||||
.DoubleExceptionVector.literal,
|
|
||||||
DOUBLEEXC_VECTOR_VADDR - 20,
|
|
||||||
SIZEOF(.UserExceptionVector.text),
|
|
||||||
.UserExceptionVector.text)
|
|
||||||
SECTION_VECTOR (_DoubleExceptionVector_text,
|
SECTION_VECTOR (_DoubleExceptionVector_text,
|
||||||
.DoubleExceptionVector.text,
|
.DoubleExceptionVector.text,
|
||||||
DOUBLEEXC_VECTOR_VADDR,
|
DOUBLEEXC_VECTOR_VADDR,
|
||||||
20,
|
.UserExceptionVector.text)
|
||||||
.DoubleExceptionVector.literal)
|
|
||||||
|
|
||||||
. = (LOADADDR( .DoubleExceptionVector.text ) + SIZEOF( .DoubleExceptionVector.text ) + 3) & ~ 3;
|
. = (LOADADDR( .DoubleExceptionVector.text ) + SIZEOF( .DoubleExceptionVector.text ) + 3) & ~ 3;
|
||||||
|
|
||||||
|
@ -323,7 +283,6 @@ SECTIONS
|
||||||
SECTION_VECTOR (_SecondaryResetVector_text,
|
SECTION_VECTOR (_SecondaryResetVector_text,
|
||||||
.SecondaryResetVector.text,
|
.SecondaryResetVector.text,
|
||||||
RESET_VECTOR1_VADDR,
|
RESET_VECTOR1_VADDR,
|
||||||
SIZEOF(.DoubleExceptionVector.text),
|
|
||||||
.DoubleExceptionVector.text)
|
.DoubleExceptionVector.text)
|
||||||
|
|
||||||
. = LOADADDR(.SecondaryResetVector.text)+SIZEOF(.SecondaryResetVector.text);
|
. = LOADADDR(.SecondaryResetVector.text)+SIZEOF(.SecondaryResetVector.text);
|
||||||
|
@ -373,5 +332,4 @@ SECTIONS
|
||||||
|
|
||||||
/* Sections to be discarded */
|
/* Sections to be discarded */
|
||||||
DISCARDS
|
DISCARDS
|
||||||
/DISCARD/ : { *(.exit.literal) }
|
|
||||||
}
|
}
|
||||||
|
|
Loading…
Reference in New Issue