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move exception handler into C-files

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This commit is contained in:
Olaf Rempel 2008-02-29 20:43:03 +01:00
parent 60cccae208
commit 773cc44a09
3 changed files with 163 additions and 147 deletions
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138
at91_init0.s
View File

@ -16,13 +16,10 @@
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
.equ AIC_IVR, (256)
.equ AIC_FVR, (260)
.equ AIC_EOICR, (304)
.equ AT91C_BASE_AIC, (0xFFFFF000)
.equ IRQ_Stack_Size, (3 * 8 * 4)
.equ FIQ_Stack_Size, (3 * 8 * 4)
.equ FIQ_Stack_Size, (0 * 8 * 4)
.equ ABT_Stack_Size, 192
.equ ARM_MODE_FIQ, 0x11
@ -46,15 +43,19 @@ rsvdvec: ldr pc, [pc, #24] /* 0x14 reserved */
irqvec: ldr pc, [pc, #24] /* 0x18 IRQ */
fiqvec: ldr pc, [pc, #24] /* 0x1c FIQ */
.extern ABT_Handler
.extern IRQ_Handler
.extern FIQ_Handler
/* 0x80000000 will result in Prefetch Abort */
.word InitReset
.word 0x80000000
.word 0x80000000
.word ABT_Handler_Entry
.word ABT_Handler_Entry
.word ABT_Handler
.word ABT_Handler
.word 0x80000000
.word IRQ_Handler_Entry
.word FIQ_Handler_Entry
.word IRQ_Handler
.word FIQ_Handler
.endfunc
@ -74,7 +75,7 @@ InitReset:
mov sp, r0
sub r0, r0, #FIQ_Stack_Size
/* store AIC Base in ARM_MODE_FIQ:r8 for faster access */
/* store AIC Base in r8_fiq for faster access */
ldr r8, =AT91C_BASE_AIC
/* Setup IRQ Mode Stack */
@ -120,122 +121,3 @@ LoopZI: cmp r1, r2
/* exit dummy for newlib */
exit: b .
.endfunc
.global ABT_Handler_Entry
.func ABT_Handler_Entry
ABT_Handler_Entry:
/* disable interrupts (F_BIT not set on entry) */
msr CPSR_c, #ARM_MODE_ABT | I_BIT | F_BIT
/* store all registers */
stmfd sp!, { r0-r12 }
/* saved cpsr (from aborted mode) */
mrs r0, SPSR
/* address of abort (pc) */
mov r3, lr
/* enter previous mode and get lr(r14), sp(r13) */
/* TODO: interrupts might be enabled? */
/* TODO: thumb mode enabled? */
msr CPSR_c, r0
mov r1, sp
mov r2, lr
/* return to abort mode */
msr CPSR_c, #ARM_MODE_ABT | I_BIT | F_BIT
/* store remaining registers (r1-r3 == r13-r15) */
stmfd sp!, { r1-r3 }
mov r1, sp
/* execute C Handler (cpsr, registers) */
ldr r5, =at91_abt_handler
mov lr, pc
bx r5
b .
.endfunc
.global FIQ_Handler_Entry
.func FIQ_Handler_Entry
FIQ_Handler_Entry:
/* Save r0 to ARM_MODE_FIQ:r9 */
mov r9, r0
/* get FIQ Vector from AIC and thus clear FIQ */
ldr r0, [r8, #AIC_FVR]
/* Switch to ARM_MODE_SVC and save registers there */
msr CPSR_c, #ARM_MODE_SVC | I_BIT | F_BIT
stmfd sp!, { r1-r3, r12, lr }
/* execute FIQ in SVC_MODE */
mov r14, pc
bx r0
/* restore registers and switch back to ARM_MODE_FIQ */
ldmia sp!, { r1-r3, r12, lr }
msr CPSR_c, #ARM_MODE_FIQ | I_BIT | F_BIT
/* restore the ARM_MODE_SVC:r0 */
mov r0, r9
/* restore PC using the LR_fiq directly */
subs pc, lr, #4
.endfunc
.global IRQ_Handler_Entry
.func IRQ_Handler_Entry
IRQ_Handler_Entry:
/* Manage Exception Entry */
/* Adjust and save LR_irq in IRQ stack */
sub lr, lr, #4
stmfd sp!, { lr }
/* Save SPSR need to be saved for nested interrupt */
mrs r14, SPSR
stmfd sp!, { r14 }
/* Save and r0 in IRQ stack */
stmfd sp!, { r0 }
/* Write in the IVR to support Protect Mode */
/* No effect in Normal Mode */
/* De-assert the NIRQ and clear the source in Protect Mode */
ldr r14, =AT91C_BASE_AIC
ldr r0, [r14, #AIC_IVR]
str r14, [r14, #AIC_IVR]
/* Enable Interrupt and Switch in Supervisor Mode */
msr CPSR_c, #ARM_MODE_SVC
/* Save scratch/used registers and LR in User Stack */
stmfd sp!, { r1-r3, r12, r14 }
/* Branch to the routine pointed by the AIC_IVR */
mov r14, pc
bx r0
/* Restore scratch/used registers and LR from User Stack */
ldmia sp!, { r1-r3, r12, r14 }
/* Disable Interrupt and switch back in IRQ mode */
msr CPSR_c, #ARM_MODE_IRQ | I_BIT
/* Mark the End of Interrupt on the AIC */
ldr r14, =AT91C_BASE_AIC
str r14, [r14, #AIC_EOICR]
/* Restore SPSR_irq and r0 from IRQ stack */
ldmia sp!, { r0 }
/* Restore SPSR_irq and r0 from IRQ stack */
ldmia sp!, { r14 }
msr SPSR_cxsf, r14
/* Restore adjusted LR_irq from IRQ stack directly in the PC */
ldmia sp!, { pc }^
.endfunc
.end

93
at91_init1.c
View File

@ -79,3 +79,96 @@ void at91_init1(void)
}
aic->AIC_SPU = (uint32_t)empty_isr;
}
__attribute__((naked)) void IRQ_Handler(void)
{
asm volatile (
".equ ARM_MODE_IRQ, 0x12 \n\t"
".equ ARM_MODE_SVC, 0x13 \n\t"
".equ I_BIT, 0x80 \n\t"
".equ AIC_IVR, (256) \n\t"
".equ AIC_EOICR, (304) \n\t"
".equ AT91C_BASE_AIC, (0xFFFFF000) \n\t"
/* Adjust and save lr_irq on IRQ stack */
"sub lr, lr, #4 \n\t"
"stmfd sp!, { lr } \n\t"
/* Save SPSR (for nested interrupts) */
"mrs r14, SPSR \n\t"
"stmfd sp!, { r14 } \n\t"
/* Save r0 on IRQ stack */
"stmfd sp!, { r0 } \n\t"
/* Write in the IVR to support Protect Mode */
"ldr r14, =AT91C_BASE_AIC \n\t"
"ldr r0, [r14, #AIC_IVR] \n\t"
"str r14, [r14, #AIC_IVR] \n\t"
/* Enable Interrupt and switch to SVC mode */
"msr CPSR_c, #ARM_MODE_SVC \n\t"
/* Save scratch/used registers and lr on SVC Stack */
"stmfd sp!, { r1-r3, r12, r14 } \n\t"
/* Branch to the routine pointed by the AIC_IVR */
"mov r14, pc \n\t"
"bx r0 \n\t"
/* Restore scratch/used registers and lr from SVC Stack */
"ldmia sp!, { r1-r3, r12, r14 } \n\t"
/* Disable Interrupt and switch back to IRQ mode */
"msr CPSR_c, #ARM_MODE_IRQ | I_BIT \n\t"
/* Mark the End of Interrupt on the AIC */
"ldr r14, =AT91C_BASE_AIC \n\t"
"str r14, [r14, #AIC_EOICR] \n\t"
/* Restore SPSR_irq and r0 from IRQ stack */
"ldmia sp!, { r0 } \n\t"
"ldmia sp!, { r14 } \n\t"
"msr SPSR_cxsf, r14 \n\t"
/* Restore adjusted lr_irq from IRQ stack */
"ldmia sp!, { pc }^ \n\t"
);
}
__attribute__((naked)) void FIQ_Handler(void)
{
asm volatile (
".equ ARM_MODE_FIQ, 0x11 \n\t"
".equ ARM_MODE_SVC, 0x13 \n\t"
".equ I_BIT, 0x80 \n\t"
".equ F_BIT, 0x40 \n\t"
".equ AIC_FVR, (260) \n\t"
/* Save r0 to r9_fiq */
"mov r9, r0 \n\t"
/* get FIQ Vector from AIC and thus clear FIQ */
"ldr r0, [r8, #AIC_FVR] \n\t"
/* Switch to SVC and save registers there */
"msr CPSR_c, #ARM_MODE_SVC | I_BIT | F_BIT \n\t"
"stmfd sp!, { r1-r3, r12, lr } \n\t"
/* execute FIQ in SVC_MODE */
"mov r14, pc \n\t"
"bx r0 \n\t"
/* restore registers and switch back to FIQ */
"ldmia sp!, { r1-r3, r12, lr } \n\t"
"msr CPSR_c, #ARM_MODE_FIQ | I_BIT | F_BIT \n\t"
/* restore the r0 from r9_fiq */
"mov r0, r9 \n\t"
/* restore PC using the lr_fiq directly */
"subs pc, lr, #4 \n\t"
);
}

49
src/at91_exceptions.c
View File

@ -59,8 +59,8 @@ ARM7TDMI 32bit Undefined Address Instruction Fetch Abort
--- Registerdump (cpsr:0xa0000013 - SVC):
r0:0x00000002 r1:0x0000000c r2:0x00200038 r3:0x80000000
r4:0x0020fffc r5:0x00101788 r6:0x00000180 r7:0x41000000
r8:0x00008400 r9:0x00100004 r10:0x03000294 fp:0x0020fe84
r12:0x0020fe10 sp:0x0020fe70 lr:0x00102174 pc:0x80000004
r8:0x00008400 r9:0x00100004 sl:0x03000294 fp:0x0020fe84
ip:0x0020fe10 sp:0x0020fe70 lr:0x00102174 pc:0x80000004
--- Stackdump:
0x0020fe70: 0x0020fe7c 0x00101648 0x001015a8 0x0020feaf
0x0020fe80: 0x0020fec0 0x0020fe90 0x00101780 0x00101620
@ -142,9 +142,9 @@ void at91_abt_handler(uint32_t cpsr, uint32_t *registers)
dbgu_hexvar(" r7:", registers[10]);
dbgu_hexvar("\n r8:", registers[11]);
dbgu_hexvar(" r9:", registers[12]);
dbgu_hexvar(" r10:", registers[13]);
dbgu_hexvar(" sl:", registers[13]);
dbgu_hexvar(" fp:", registers[14]);
dbgu_hexvar("\nr12:", registers[15]);
dbgu_hexvar("\n ip:", registers[15]);
dbgu_hexvar(" sp:", registers[0]);
dbgu_hexvar(" lr:", registers[1]);
dbgu_hexvar(" pc:", registers[2]);
@ -160,3 +160,44 @@ void at91_abt_handler(uint32_t cpsr, uint32_t *registers)
}
dbgu_putchar('\n');
}
__attribute__((naked)) void ABT_Handler(void)
{
asm volatile (
".equ ARM_MODE_ABT, 0x17 \n\t"
".equ I_BIT, 0x80 \n\t"
".equ F_BIT, 0x40 \n\t"
/* disable interrupts (F_BIT not set on entry) */
"msr CPSR_c, #ARM_MODE_ABT | I_BIT | F_BIT \n\t"
/* store all registers */
"stmfd sp!, { r0-r12 } \n\t"
/* saved cpsr (from aborted mode) */
"mrs r0, SPSR \n\t"
/* address of abort (pc) */
"mov r3, lr \n\t"
/* enter previous mode and get lr(r14), sp(r13) */
/* TODO: interrupts might be enabled? */
/* TODO: thumb mode enabled? */
"msr CPSR_c, r0 \n\t"
"mov r1, sp \n\t"
"mov r2, lr \n\t"
/* return to abort mode */
"msr CPSR_c, #ARM_MODE_ABT | I_BIT | F_BIT \n\t"
/* store remaining registers (r1-r3 == r13-r15) */
"stmfd sp!, { r1-r3 } \n\t"
"mov r1, sp \n\t"
/* execute C Handler (cpsr, registers) */
"ldr r5, =at91_abt_handler \n\t"
"mov lr, pc \n\t"
"bx r5 \n\t"
"b . \n\t"
);
}