[RTEMS Project] #3779: arm_switch_reg undeclared when building libdebugger/rtems-debugger-arm

[RTEMS trac]

#3779: arm_switch_reg undeclared when building libdebugger/rtems-debugger-arm
----------------------------+--------------------------
 Reporter:  Andrei Chichak  |       Owner:  Chris Johns
     Type:  defect          |      Status:  assigned
 Priority:  normal          |   Milestone:
Component:  lib/debugger    |     Version:
 Severity:  normal          |  Resolution:
 Keywords:                  |  Blocked By:
 Blocking:                  |
----------------------------+--------------------------

Comment (by sprhawk):

 I'm new to rtems. I also encountered this problem.
 I dig into source code, in
 commit:8798372261ed1:cpukit/libdebugger/rtems-debugger-arm.c:83-95:

 {{{
 #!c
 #if !ARM_THUMB_ONLY && defined(__thumb__)
   #define ARM_SWITCH_REG       uint32_t arm_switch_reg
   #define ARM_SWITCH_REG_ASM   [arm_switch_reg] "=&r" (arm_switch_reg)
   #define ARM_SWITCH_REG_ASM_L ARM_SWITCH_REG_ASM,
   #define ASM_ARM_MODE         ".align 2\nbx pc\n.arm\n"
   #define ASM_THUMB_MODE       "add %[arm_switch_reg], pc, #1\nbx
 %[arm_switch_reg]\n.thumb\n"
 #else
   #define ARM_SWITCH_REG
   #define ARM_SWITCH_REG_ASM
   #define ARM_SWITCH_REG_ASM_L
   #define ASM_ARM_MODE
   #define ASM_THUMB_MODE
 #endif
 }}}
 here, code for stm32f4 is compiled with flag -mpu cortex-m4, which is
 ARM_THUMB_ONLY, __ARM_ARCH_7M__, so above defines will result
 ARM_SWITCH_REG to empty.

 in line 1592, 1593,

 it is defined as
 {{{
 #!c
 #elif defined(ARM_MULTILIB_ARCH_V7M)
   #define EXCEPTION_ENTRY_EXC()               (void) arm_switch_reg
 }}}

 when compiled, it will report undeclared identifier arm_switch_reg

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Ticket URL: <http://devel.rtems.org/ticket/3779#comment:1>
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