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    • Heinrich Schuchardt's avatar
      ARM: correct detection of thumb mode · 0c1456d5
      Heinrich Schuchardt authored
      When a crash occurs in thumb mode the crash dump is incorrect. This is due
      to the usage of a non-existing configuration variable CONFIG_ARM_THUMB in
      the definition of macro thumb_mode(regs).
      
      Use CONFIG_IS_ENABLED(SYS_THUMB_BUILD) to detect that the code has been
      compiled for thumb mode. Remove ARM_THUMB from config_whitelist.txt.
      
      With the patch crash dumps indicate thumb mode correctly.
      
      On a system with thumb mode:
      
      => exception unaligned
      data abort
      pc : [<8f7a2b52>]          lr : [<8f7ab1ef>]
      reloc pc : [<1780cb52>]    lr : [<178151ef>]
      sp : 8ed8c3f8  ip : 8f7a2b4d     fp : 00000002
      r10: 8f7f8228  r9 : 8ed95ea8     r8 : 8ed99488
      r7 : 8f7ab141  r6 : 00000000     r5 : 8ed8c3f9  r4 : 8f7f6390
      r3 : 8ed9948c  r2 : 00000001     r1 : 00000000  r0 : 8f7f6390
      Flags: nzCv  IRQs off  FIQs off  Mode SVC_32 (T)
      Code: 8f7e 466d f105 0501 (e9d5) 6700
      
      The Flags line has '(T)' and in the Code line the output is in u16 groups.
      
      On a system without thumb mode:
      
      => exception breakpoint
      prefetch abort
      pc : [<7ff5a5c8>]          lr : [<7ff675ec>]
      reloc pc : [<0000e5c8>]    lr : [<0001b5ec>]
      sp : 7ee0ad80  ip : 7ff5a5cc     fp : 7ff674cc
      r10: 00000002  r9 : 7ef0bed8     r8 : 7ffd6214
      r7 : 7ef0e080  r6 : 00000000     r5 : 7ffd4090  r4 : 00000000
      r3 : 7ef0e084  r2 : 00000001     r1 : 00000000  r0 : 7ffd4090
      Flags: nzCv  IRQs off  FIQs off  Mode SVC_32
      Code: e1a0500d e2855001 e1c560d0 e3a00001 (e12fff1e)
      
      The Flags line does not show '(T)' and in the Code line the output is in
      u32 groups.
      Reported-by: Marek Vasut's avatarMarek Vasut <marex@denx.de>
      Signed-off-by: Heinrich Schuchardt's avatarHeinrich Schuchardt <xypron.glpk@gmx.de>
      Reviewed-by: Marek Vasut's avatarMarek Vasut <marex@denx.de>
      0c1456d5
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