diff options
| -rw-r--r-- | libgloss/arc/crt0.S | 107 |
1 files changed, 34 insertions, 73 deletions
diff --git a/libgloss/arc/crt0.S b/libgloss/arc/crt0.S index 99c871f..1d966c2 100644 --- a/libgloss/arc/crt0.S +++ b/libgloss/arc/crt0.S @@ -61,29 +61,40 @@ #if defined (__ARCEM__) || defined (__ARCHS__) .section .ivt, "a", @progbits -; handler's name, type, number,name, offset in IVT (hex/dec) -.word __start ; exception 0 program entry point 0x0 0 -.word memory_error ; exception 1 memory_error 0x4 4 -.word instruction_error ; exception 2 instruction_error 0x8 8 -.word EV_MachineCheck ; exception 3 EV_MachineCheck 0xC 12 -.word EV_TLBMissI ; exception 4 EV_TLBMissI 0x10 16 -.word EV_TLBMissD ; exception 5 EV_TLBMissD 0x14 20 -.word EV_ProtV ; exception 6 EV_ProtV 0x18 24 -.word EV_PrivilegeV ; exception 7 EV_PrivilegeV 0x1C 28 -.word EV_SWI ; exception 8 EV_SWI 0x20 32 -.word EV_Trap ; exception 9 EV_Trap 0x24 36 -.word EV_Extension ; exception 10 EV_Extension 0x28 40 -.word EV_DivZero ; exception 11 EV_DivZero 0x2C 44 -.word EV_DCError ; exception 12 EV_DCError 0x30 48 -.word EV_Malignedr ; exception 13 EV_Maligned 0x34 52 -.word _exit_halt ; exception 14 unused 0x38 56 -.word _exit_halt ; exception 15 unused 0x3C 60 -.word IRQ_Timer0 ; IRQ 16 Timer 0 0x40 64 -.word IRQ_Timer1 ; IRQ 17 Timer 1 0x44 68 -.word IRQ_18 ; IRQ 18 0x48 72 -.word IRQ_19 ; IRQ 19 0x4C 76 -.word IRQ_20 ; IRQ 20 0x50 80 - +; Helper macro to define weak symbols to include into interrupt vector table. +; User code may define those functions in them, so user function will be +; referenced in the IVT. By default all handlers point to _exit_halt - so they +; always cause application halt, because if application causes an exception or +; interrupt, but doesn't set a handler for it - something is wrong in +; application. Exception is "start" entry of IVT, which points to __start +; function. +#define IVT_ENTRY(name) \ + .word name `\ + .weak name `\ + .set name, _exit_halt + +; handler's name, number, name, offset in IVT (hex/dec) +.word __start ; 0 program entry point 0x0 0 +IVT_ENTRY(memory_error) ; 1 memory_error 0x4 4 +IVT_ENTRY(instruction_error) ; 2 instruction_error 0x8 8 +IVT_ENTRY(EV_MachineCheck) ; 3 EV_MachineCheck 0xC 12 +IVT_ENTRY(EV_TLBMissI) ; 4 EV_TLBMissI 0x10 16 +IVT_ENTRY(EV_TLBMissD) ; 5 EV_TLBMissD 0x14 20 +IVT_ENTRY(EV_ProtV) ; 6 EV_ProtV 0x18 24 +IVT_ENTRY(EV_PrivilegeV) ; 7 EV_PrivilegeV 0x1C 28 +IVT_ENTRY(EV_SWI) ; 8 EV_SWI 0x20 32 +IVT_ENTRY(EV_Trap) ; 9 EV_Trap 0x24 36 +IVT_ENTRY(EV_Extension) ; 10 EV_Extension 0x28 40 +IVT_ENTRY(EV_DivZero) ; 11 EV_DivZero 0x2C 44 +IVT_ENTRY(EV_DCError) ; 12 EV_DCError 0x30 48 +IVT_ENTRY(EV_Maligned) ; 13 EV_Maligned 0x34 52 +IVT_ENTRY(EV_Ex14) ; 14 unused 0x38 56 +IVT_ENTRY(EV_Ex15) ; 15 unused 0x3C 60 +IVT_ENTRY(IRQ_Timer0) ; 16 Timer 0 0x40 64 +IVT_ENTRY(IRQ_Timer1) ; 17 Timer 1 0x44 68 +IVT_ENTRY(IRQ_18) ; 18 0x48 72 +IVT_ENTRY(IRQ_19) ; 19 0x4C 76 +IVT_ENTRY(IRQ_20) ; 20 0x50 80 .section .text.__startup, "ax", @progbits #else @@ -196,56 +207,6 @@ __start: ; r0 contains exit code j @exit -#if defined (__ARCEM__) || defined (__ARCHS__) -; ARCv2 default interrupt routines, defined as weak symbols. -; Default implementation halts the core. To conserve code size those symbols -; share a single implementation, however as a downside debugger and -; disassembler will not be able to distinguish one from another. -.weak memory_error -.weak instruction_error -.weak EV_MachineCheck -.weak EV_TLBMissI -.weak EV_TLBMissD -.weak EV_ProtV -.weak EV_PrivilegeV -.weak EV_SWI -.weak EV_Trap -.weak EV_Extension -.weak EV_DivZero -.weak EV_DCError -.weak EV_Malignedr -.weak IRQ_Timer0 -.weak IRQ_Timer1 -.weak IRQ_18 -.weak IRQ_19 -.weak IRQ_20 - -.balign 4 -memory_error : -instruction_error : -EV_MachineCheck : -EV_TLBMissI : -EV_TLBMissD : -EV_ProtV : -EV_PrivilegeV : -EV_SWI : -EV_Trap : -EV_Extension : -EV_DivZero : -EV_DCError : -EV_Malignedr : -IRQ_Timer0 : -IRQ_Timer1 : -IRQ_18 : -IRQ_19 : -IRQ_20 : -.Lloop_halt: - flag 0x01 - nop - b .Lloop_halt - nop -#endif /* __ARCEM__ || __ARCHS__ */ - .section .text._exit_halt,"ax",@progbits .global _exit_halt .type _exit_halt, @function |