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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-18 16:06:44 +07:00
4d47ce158e
When support for !MMU was added, the declaration of
__asm_copy_to_user() & __asm_copy_from_user() were #ifdefed
out hence their EXPORT_SYMBOL() give an error message like:
.../riscv_ksyms.c:13:15: error: '__asm_copy_to_user' undeclared here
.../riscv_ksyms.c:14:15: error: '__asm_copy_from_user' undeclared here
Since these symbols are not defined with !MMU it's wrong to export them.
Same for __clear_user() (even though this one is also declared in
include/asm-generic/uaccess.h and thus doesn't give an error message).
Fix this by doing the EXPORT_SYMBOL() directly where these symbols
are defined: inside lib/uaccess.S itself.
Fixes: 6bd33e1ece ("riscv: fix compile failure with EXPORT_SYMBOL() & !MMU")
Reported-by: kbuild test robot <lkp@intel.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
129 lines
2.4 KiB
ArmAsm
129 lines
2.4 KiB
ArmAsm
#include <linux/linkage.h>
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#include <asm-generic/export.h>
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#include <asm/asm.h>
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#include <asm/csr.h>
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.altmacro
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.macro fixup op reg addr lbl
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LOCAL _epc
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_epc:
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\op \reg, \addr
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.section __ex_table,"a"
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.balign RISCV_SZPTR
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RISCV_PTR _epc, \lbl
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.previous
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.endm
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ENTRY(__asm_copy_to_user)
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ENTRY(__asm_copy_from_user)
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/* Enable access to user memory */
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li t6, SR_SUM
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csrs CSR_STATUS, t6
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add a3, a1, a2
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/* Use word-oriented copy only if low-order bits match */
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andi t0, a0, SZREG-1
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andi t1, a1, SZREG-1
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bne t0, t1, 2f
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addi t0, a1, SZREG-1
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andi t1, a3, ~(SZREG-1)
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andi t0, t0, ~(SZREG-1)
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/*
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* a3: terminal address of source region
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* t0: lowest XLEN-aligned address in source
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* t1: highest XLEN-aligned address in source
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*/
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bgeu t0, t1, 2f
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bltu a1, t0, 4f
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1:
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fixup REG_L, t2, (a1), 10f
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fixup REG_S, t2, (a0), 10f
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addi a1, a1, SZREG
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addi a0, a0, SZREG
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bltu a1, t1, 1b
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2:
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bltu a1, a3, 5f
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3:
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/* Disable access to user memory */
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csrc CSR_STATUS, t6
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li a0, 0
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ret
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4: /* Edge case: unalignment */
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fixup lbu, t2, (a1), 10f
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fixup sb, t2, (a0), 10f
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addi a1, a1, 1
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addi a0, a0, 1
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bltu a1, t0, 4b
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j 1b
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5: /* Edge case: remainder */
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fixup lbu, t2, (a1), 10f
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fixup sb, t2, (a0), 10f
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addi a1, a1, 1
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addi a0, a0, 1
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bltu a1, a3, 5b
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j 3b
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ENDPROC(__asm_copy_to_user)
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ENDPROC(__asm_copy_from_user)
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EXPORT_SYMBOL(__asm_copy_to_user)
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EXPORT_SYMBOL(__asm_copy_from_user)
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ENTRY(__clear_user)
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/* Enable access to user memory */
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li t6, SR_SUM
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csrs CSR_STATUS, t6
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add a3, a0, a1
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addi t0, a0, SZREG-1
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andi t1, a3, ~(SZREG-1)
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andi t0, t0, ~(SZREG-1)
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/*
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* a3: terminal address of target region
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* t0: lowest doubleword-aligned address in target region
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* t1: highest doubleword-aligned address in target region
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*/
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bgeu t0, t1, 2f
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bltu a0, t0, 4f
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1:
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fixup REG_S, zero, (a0), 11f
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addi a0, a0, SZREG
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bltu a0, t1, 1b
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2:
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bltu a0, a3, 5f
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3:
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/* Disable access to user memory */
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csrc CSR_STATUS, t6
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li a0, 0
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ret
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4: /* Edge case: unalignment */
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fixup sb, zero, (a0), 11f
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addi a0, a0, 1
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bltu a0, t0, 4b
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j 1b
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5: /* Edge case: remainder */
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fixup sb, zero, (a0), 11f
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addi a0, a0, 1
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bltu a0, a3, 5b
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j 3b
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ENDPROC(__clear_user)
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EXPORT_SYMBOL(__clear_user)
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.section .fixup,"ax"
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.balign 4
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/* Fixup code for __copy_user(10) and __clear_user(11) */
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10:
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/* Disable access to user memory */
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csrs CSR_STATUS, t6
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mv a0, a2
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ret
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11:
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csrs CSR_STATUS, t6
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mv a0, a1
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ret
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.previous
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