1. 21 Jul, 2020 6 commits
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  6. 22 Jun, 2020 1 commit
    • Lichao Liu's avatar
      MIPS: Loongson-2EF: disable fix-loongson3-llsc in compiler · 2984b3f8
      Lichao Liu authored
      Firstly, Loongson-2EF support ll/sc instructions, but
      doesn't need fix-loongson3-llsc compile option.
      
      Secondly, fix-loongson3-llsc will cause kernel startup
      fail at futex_init, because compiler will add 'sync' before
      'll', which will affect __ex_table.
      futex_init will pass NULL uaddr parameter to
      futex_atomic_cmpxchg_inatomic.
      futex_atomic_cmpxchg_inatomic will access uaddr directly,
      which will cause page fault exception, the exception should be
      handled by __ex_table's nextinsn if the exception insn exsit in
      __ex_table. Because __ex_table is affected by compiler,
      the exception can not be handled, and
      futex_atomic_cmpxchg_inatomic will crash.
      
      Error code as below:
      __ex_table.insn = 1b, which is 'sync' compiled with
      fix-loongson3-llsc, but the actual exception instrction is ll.
      So, do_page_fault will not find the correct inst in __ex_table, and
      can not handle this exception.
      
              "1: "user_ll("%1", "%3")"               \n"
              "   bne %1, %z4, 3f             \n"
              "   .set    pop                 \n"
              "   move    $1, %z5                 \n"
              "   .set    "MIPS_ISA_ARCH_LEVEL"           \n"
              "2: "user_sc("$1", "%2")"               \n"
              "   beqz    $1, 1b                  \n"
              "3: " __SYNC_ELSE(full, loongson3_war, __WEAK_LLSC_MB) "\n"
              "   .insn                       \n"
              "   .set    pop                 \n"
              "   .section .fixup,\"ax\"              \n"
              "4: li  %0, %6                  \n"
              "   j   3b                  \n"
              "   .previous                   \n"
              "   .section __ex_table,\"a\"           \n"
              "   "__UA_ADDR "\t1b, 4b                \n"
              "   "__UA_ADDR "\t2b, 4b                \n"
              "   .previous
      Signed-off-by: default avatarLichao Liu <liulichao@loongson.cn>
      Reviewed-by: default avatarJiaxun Yang <jiaxun.yang@flygoat.com>
      Signed-off-by: default avatarThomas Bogendoerfer <tsbogend@alpha.franken.de>
      2984b3f8
  7. 15 Jun, 2020 1 commit