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Prepare the RISC-V port layer for addition of 64-bit port.

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pull/4/head
Richard Barry 6 years ago
parent 50e67a89f1
commit 06596c3192
1 changed files with 136 additions and 126 deletions
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262
FreeRTOS/Source/portable/GCC/RISC-V/portASM.S
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@ -28,8 +28,12 @@
#if __riscv_xlen == 64 #if __riscv_xlen == 64
#error Not implemented yet - change lw to ld, and sw to sd. #error Not implemented yet - change lw to ld, and sw to sd.
#define portWORD_SIZE 8 #define portWORD_SIZE 8
#define store_x sd
#define load_x ld
#elif __riscv_xlen == 32 #elif __riscv_xlen == 32
#define portWORD_SIZE 4 #define portWORD_SIZE 4
#define store_x sw
#define load_x lw
#else #else
#error Assembler did not define __riscv_xlen #error Assembler did not define __riscv_xlen
#endif #endif
@ -101,42 +105,42 @@ at the top of this file. */
.func .func
freertos_risc_v_trap_handler: freertos_risc_v_trap_handler:
addi sp, sp, -portCONTEXT_SIZE addi sp, sp, -portCONTEXT_SIZE
sw x1, 1 * portWORD_SIZE( sp ) store_x x1, 1 * portWORD_SIZE( sp )
sw x5, 2 * portWORD_SIZE( sp ) store_x x5, 2 * portWORD_SIZE( sp )
sw x6, 3 * portWORD_SIZE( sp ) store_x x6, 3 * portWORD_SIZE( sp )
sw x7, 4 * portWORD_SIZE( sp ) store_x x7, 4 * portWORD_SIZE( sp )
sw x8, 5 * portWORD_SIZE( sp ) store_x x8, 5 * portWORD_SIZE( sp )
sw x9, 6 * portWORD_SIZE( sp ) store_x x9, 6 * portWORD_SIZE( sp )
sw x10, 7 * portWORD_SIZE( sp ) store_x x10, 7 * portWORD_SIZE( sp )
sw x11, 8 * portWORD_SIZE( sp ) store_x x11, 8 * portWORD_SIZE( sp )
sw x12, 9 * portWORD_SIZE( sp ) store_x x12, 9 * portWORD_SIZE( sp )
sw x13, 10 * portWORD_SIZE( sp ) store_x x13, 10 * portWORD_SIZE( sp )
sw x14, 11 * portWORD_SIZE( sp ) store_x x14, 11 * portWORD_SIZE( sp )
sw x15, 12 * portWORD_SIZE( sp ) store_x x15, 12 * portWORD_SIZE( sp )
sw x16, 13 * portWORD_SIZE( sp ) store_x x16, 13 * portWORD_SIZE( sp )
sw x17, 14 * portWORD_SIZE( sp ) store_x x17, 14 * portWORD_SIZE( sp )
sw x18, 15 * portWORD_SIZE( sp ) store_x x18, 15 * portWORD_SIZE( sp )
sw x19, 16 * portWORD_SIZE( sp ) store_x x19, 16 * portWORD_SIZE( sp )
sw x20, 17 * portWORD_SIZE( sp ) store_x x20, 17 * portWORD_SIZE( sp )
sw x21, 18 * portWORD_SIZE( sp ) store_x x21, 18 * portWORD_SIZE( sp )
sw x22, 19 * portWORD_SIZE( sp ) store_x x22, 19 * portWORD_SIZE( sp )
sw x23, 20 * portWORD_SIZE( sp ) store_x x23, 20 * portWORD_SIZE( sp )
sw x24, 21 * portWORD_SIZE( sp ) store_x x24, 21 * portWORD_SIZE( sp )
sw x25, 22 * portWORD_SIZE( sp ) store_x x25, 22 * portWORD_SIZE( sp )
sw x26, 23 * portWORD_SIZE( sp ) store_x x26, 23 * portWORD_SIZE( sp )
sw x27, 24 * portWORD_SIZE( sp ) store_x x27, 24 * portWORD_SIZE( sp )
sw x28, 25 * portWORD_SIZE( sp ) store_x x28, 25 * portWORD_SIZE( sp )
sw x29, 26 * portWORD_SIZE( sp ) store_x x29, 26 * portWORD_SIZE( sp )
sw x30, 27 * portWORD_SIZE( sp ) store_x x30, 27 * portWORD_SIZE( sp )
sw x31, 28 * portWORD_SIZE( sp ) store_x x31, 28 * portWORD_SIZE( sp )
csrr t0, mstatus /* Required for MPIE bit. */ csrr t0, mstatus /* Required for MPIE bit. */
sw t0, 29 * portWORD_SIZE( sp ) store_x t0, 29 * portWORD_SIZE( sp )
portasmSAVE_ADDITIONAL_REGISTERS /* Defined in freertos_risc_v_chip_specific_extensions.h to save any registers unique to the RISC-V implementation. */ portasmSAVE_ADDITIONAL_REGISTERS /* Defined in freertos_risc_v_chip_specific_extensions.h to save any registers unique to the RISC-V implementation. */
lw t0, pxCurrentTCB /* Load pxCurrentTCB. */ load_x t0, pxCurrentTCB /* Load pxCurrentTCB. */
sw sp, 0( t0 ) /* Write sp to first TCB member. */ store_x sp, 0( t0 ) /* Write sp to first TCB member. */
csrr a0, mcause csrr a0, mcause
csrr a1, mepc csrr a1, mepc
@ -144,32 +148,38 @@ freertos_risc_v_trap_handler:
test_if_asynchronous: test_if_asynchronous:
srli a2, a0, 0x1f /* MSB of mcause is 1 if handing an asynchronous interrupt - shift to LSB to clear other bits. */ srli a2, a0, 0x1f /* MSB of mcause is 1 if handing an asynchronous interrupt - shift to LSB to clear other bits. */
beq a2, x0, handle_synchronous /* Branch past interrupt handing if not asynchronous. */ beq a2, x0, handle_synchronous /* Branch past interrupt handing if not asynchronous. */
sw a1, 0( sp ) /* Asynch so save unmodified exception return address. */ store_x a1, 0( sp ) /* Asynch so save unmodified exception return address. */
handle_asynchronous: handle_asynchronous:
#if( portasmHAS_CLINT != 0 ) #if( portasmHAS_CLINT != 0 )
test_if_mtimer: /* If there is a CLINT then the mtimer is used to generate the tick interrupt. */ test_if_mtimer: /* If there is a CLINT then the mtimer is used to generate the tick interrupt. */
lui t0, 0x80000
addi t1, t0, 7 /* 0x80000007 == machine timer interrupt. */ addi t0, x0, 1
bne a0, t1, test_if_external_interrupt
#if( __riscv_xlen == 32 )
lw t0, pullMachineTimerCompareRegister /* Load address of compare register into t0. */ slli t0, t0, 31 /* LSB is already set, shift into MSB. */
lw t1, pullNextTime /* Load the address of ullNextTime into t1. */ addi t1, t0, 7 /* 0x80000007 == machine timer interrupt. */
lw t2, 0(t1) /* Load the low word of ullNextTime into t2. */ bne a0, t1, test_if_external_interrupt
lw t3, 4(t1) /* Load the high word of ullNextTime into t3. */
sw t2, 0(t0) /* Store low word of ullNextTime into compare register. */ lw t0, pullMachineTimerCompareRegister /* Load address of compare register into t0. */
sw t3, 4(t0) /* Store high word of ullNextTime into compare register. */ lw t1, pullNextTime /* Load the address of ullNextTime into t1. */
lw t0, ulTimerIncrementsForOneTick /* Load the value of ullTimerIncrementForOneTick into t0 (could this be optimized by storing in an array next to pullNextTime?). */ lw t2, 0(t1) /* Load the low word of ullNextTime into t2. */
add t4, t0, t2 /* Add the low word of ullNextTime to the timer increments for one tick (assumes timer increment for one tick fits in 32-bits. */ lw t3, 4(t1) /* Load the high word of ullNextTime into t3. */
sltu t5, t4, t2 /* See if the sum of low words overflowed (what about the zero case?). */ sw t2, 0(t0) /* Store low word of ullNextTime into compare register. */
add t6, t3, t5 /* Add overflow to high word of ullNextTime. */ sw t3, 4(t0) /* Store high word of ullNextTime into compare register. */
sw t4, 0(t1) /* Store new low word of ullNextTime. */ lw t0, ulTimerIncrementsForOneTick /* Load the value of ullTimerIncrementForOneTick into t0 (could this be optimized by storing in an array next to pullNextTime?). */
sw t6, 4(t1) /* Store new high word of ullNextTime. */ add t4, t0, t2 /* Add the low word of ullNextTime to the timer increments for one tick (assumes timer increment for one tick fits in 32-bits. */
lw sp, xISRStackTop /* Switch to ISR stack before function call. */ sltu t5, t4, t2 /* See if the sum of low words overflowed (what about the zero case?). */
add t6, t3, t5 /* Add overflow to high word of ullNextTime. */
sw t4, 0(t1) /* Store new low word of ullNextTime. */
sw t6, 4(t1) /* Store new high word of ullNextTime. */
#endif /* __riscv_xlen == 32 */
load_x sp, xISRStackTop /* Switch to ISR stack before function call. */
jal xTaskIncrementTick jal xTaskIncrementTick
beqz a0, processed_source /* Don't switch context if incrementing tick didn't unblock a task. */ beqz a0, processed_source /* Don't switch context if incrementing tick didn't unblock a task. */
jal vTaskSwitchContext jal vTaskSwitchContext
j processed_source j processed_source
@ -179,18 +189,18 @@ handle_asynchronous:
#endif /* portasmHAS_CLINT */ #endif /* portasmHAS_CLINT */
lw sp, xISRStackTop /* Switch to ISR stack before function call. */ load_x sp, xISRStackTop /* Switch to ISR stack before function call. */
jal portasmHANDLE_INTERRUPT /* Jump to the interrupt handler if there is no CLINT or if there is a CLINT and it has been determined that an external interrupt is pending. */ jal portasmHANDLE_INTERRUPT /* Jump to the interrupt handler if there is no CLINT or if there is a CLINT and it has been determined that an external interrupt is pending. */
j processed_source j processed_source
handle_synchronous: handle_synchronous:
addi a1, a1, 4 /* Synchronous so updated exception return address to the instruction after the instruction that generated the exeption. */ addi a1, a1, 4 /* Synchronous so updated exception return address to the instruction after the instruction that generated the exeption. */
sw a1, 0( sp ) /* Save updated exception return address. */ store_x a1, 0( sp ) /* Save updated exception return address. */
test_if_environment_call: test_if_environment_call:
li t0, 11 /* 11 == environment call. */ li t0, 11 /* 11 == environment call. */
bne a0, t0, is_exception /* Not an M environment call, so some other exception. */ bne a0, t0, is_exception /* Not an M environment call, so some other exception. */
lw sp, xISRStackTop /* Switch to ISR stack before function call. */ load_x sp, xISRStackTop /* Switch to ISR stack before function call. */
jal vTaskSwitchContext jal vTaskSwitchContext
j processed_source j processed_source
@ -203,47 +213,47 @@ as_yet_unhandled:
j as_yet_unhandled j as_yet_unhandled
processed_source: processed_source:
lw sp, pxCurrentTCB /* Load pxCurrentTCB. */ load_x sp, pxCurrentTCB /* Load pxCurrentTCB. */
lw sp, 0( sp ) /* Read sp from first TCB member. */ load_x sp, 0( sp ) /* Read sp from first TCB member. */
/* Load mret with the address of the next instruction in the task to run next. */ /* Load mret with the address of the next instruction in the task to run next. */
lw t0, 0( sp ) load_x t0, 0( sp )
csrw mepc, t0 csrw mepc, t0
portasmRESTORE_ADDITIONAL_REGISTERS /* Defined in freertos_risc_v_chip_specific_extensions.h to restore any registers unique to the RISC-V implementation. */ portasmRESTORE_ADDITIONAL_REGISTERS /* Defined in freertos_risc_v_chip_specific_extensions.h to restore any registers unique to the RISC-V implementation. */
/* Load mstatus with the interrupt enable bits used by the task. */ /* Load mstatus with the interrupt enable bits used by the task. */
lw t0, 29 * portWORD_SIZE( sp ) load_x t0, 29 * portWORD_SIZE( sp )
csrw mstatus, t0 /* Required for MPIE bit. */ csrw mstatus, t0 /* Required for MPIE bit. */
lw x1, 1 * portWORD_SIZE( sp ) load_x x1, 1 * portWORD_SIZE( sp )
lw x5, 2 * portWORD_SIZE( sp ) /* t0 */ load_x x5, 2 * portWORD_SIZE( sp ) /* t0 */
lw x6, 3 * portWORD_SIZE( sp ) /* t1 */ load_x x6, 3 * portWORD_SIZE( sp ) /* t1 */
lw x7, 4 * portWORD_SIZE( sp ) /* t2 */ load_x x7, 4 * portWORD_SIZE( sp ) /* t2 */
lw x8, 5 * portWORD_SIZE( sp ) /* s0/fp */ load_x x8, 5 * portWORD_SIZE( sp ) /* s0/fp */
lw x9, 6 * portWORD_SIZE( sp ) /* s1 */ load_x x9, 6 * portWORD_SIZE( sp ) /* s1 */
lw x10, 7 * portWORD_SIZE( sp ) /* a0 */ load_x x10, 7 * portWORD_SIZE( sp ) /* a0 */
lw x11, 8 * portWORD_SIZE( sp ) /* a1 */ load_x x11, 8 * portWORD_SIZE( sp ) /* a1 */
lw x12, 9 * portWORD_SIZE( sp ) /* a2 */ load_x x12, 9 * portWORD_SIZE( sp ) /* a2 */
lw x13, 10 * portWORD_SIZE( sp ) /* a3 */ load_x x13, 10 * portWORD_SIZE( sp ) /* a3 */
lw x14, 11 * portWORD_SIZE( sp ) /* a4 */ load_x x14, 11 * portWORD_SIZE( sp ) /* a4 */
lw x15, 12 * portWORD_SIZE( sp ) /* a5 */ load_x x15, 12 * portWORD_SIZE( sp ) /* a5 */
lw x16, 13 * portWORD_SIZE( sp ) /* a6 */ load_x x16, 13 * portWORD_SIZE( sp ) /* a6 */
lw x17, 14 * portWORD_SIZE( sp ) /* a7 */ load_x x17, 14 * portWORD_SIZE( sp ) /* a7 */
lw x18, 15 * portWORD_SIZE( sp ) /* s2 */ load_x x18, 15 * portWORD_SIZE( sp ) /* s2 */
lw x19, 16 * portWORD_SIZE( sp ) /* s3 */ load_x x19, 16 * portWORD_SIZE( sp ) /* s3 */
lw x20, 17 * portWORD_SIZE( sp ) /* s4 */ load_x x20, 17 * portWORD_SIZE( sp ) /* s4 */
lw x21, 18 * portWORD_SIZE( sp ) /* s5 */ load_x x21, 18 * portWORD_SIZE( sp ) /* s5 */
lw x22, 19 * portWORD_SIZE( sp ) /* s6 */ load_x x22, 19 * portWORD_SIZE( sp ) /* s6 */
lw x23, 20 * portWORD_SIZE( sp ) /* s7 */ load_x x23, 20 * portWORD_SIZE( sp ) /* s7 */
lw x24, 21 * portWORD_SIZE( sp ) /* s8 */ load_x x24, 21 * portWORD_SIZE( sp ) /* s8 */
lw x25, 22 * portWORD_SIZE( sp ) /* s9 */ load_x x25, 22 * portWORD_SIZE( sp ) /* s9 */
lw x26, 23 * portWORD_SIZE( sp ) /* s10 */ load_x x26, 23 * portWORD_SIZE( sp ) /* s10 */
lw x27, 24 * portWORD_SIZE( sp ) /* s11 */ load_x x27, 24 * portWORD_SIZE( sp ) /* s11 */
lw x28, 25 * portWORD_SIZE( sp ) /* t3 */ load_x x28, 25 * portWORD_SIZE( sp ) /* t3 */
lw x29, 26 * portWORD_SIZE( sp ) /* t4 */ load_x x29, 26 * portWORD_SIZE( sp ) /* t4 */
lw x30, 27 * portWORD_SIZE( sp ) /* t5 */ load_x x30, 27 * portWORD_SIZE( sp ) /* t5 */
lw x31, 28 * portWORD_SIZE( sp ) /* t6 */ load_x x31, 28 * portWORD_SIZE( sp ) /* t6 */
addi sp, sp, portCONTEXT_SIZE addi sp, sp, portCONTEXT_SIZE
mret mret
@ -262,43 +272,43 @@ xPortStartFirstTask:
csrw mtvec, t0 csrw mtvec, t0
#endif /* portasmHAS_CLILNT */ #endif /* portasmHAS_CLILNT */
lw sp, pxCurrentTCB /* Load pxCurrentTCB. */ load_x sp, pxCurrentTCB /* Load pxCurrentTCB. */
lw sp, 0( sp ) /* Read sp from first TCB member. */ load_x sp, 0( sp ) /* Read sp from first TCB member. */
lw x1, 0( sp ) /* Note for starting the scheduler the exception return address is used as the function return address. */ load_x x1, 0( sp ) /* Note for starting the scheduler the exception return address is used as the function return address. */
portasmRESTORE_ADDITIONAL_REGISTERS /* Defined in freertos_risc_v_chip_specific_extensions.h to restore any registers unique to the RISC-V implementation. */ portasmRESTORE_ADDITIONAL_REGISTERS /* Defined in freertos_risc_v_chip_specific_extensions.h to restore any registers unique to the RISC-V implementation. */
lw t0, 29 * portWORD_SIZE( sp ) /* mstatus */ load_x t0, 29 * portWORD_SIZE( sp ) /* mstatus */
csrrw x0, mstatus, t0 /* Interrupts enabled from here! */ csrrw x0, mstatus, t0 /* Interrupts enabled from here! */
lw x5, 2 * portWORD_SIZE( sp ) /* t0 */ load_x x5, 2 * portWORD_SIZE( sp ) /* t0 */
lw x6, 3 * portWORD_SIZE( sp ) /* t1 */ load_x x6, 3 * portWORD_SIZE( sp ) /* t1 */
lw x7, 4 * portWORD_SIZE( sp ) /* t2 */ load_x x7, 4 * portWORD_SIZE( sp ) /* t2 */
lw x8, 5 * portWORD_SIZE( sp ) /* s0/fp */ load_x x8, 5 * portWORD_SIZE( sp ) /* s0/fp */
lw x9, 6 * portWORD_SIZE( sp ) /* s1 */ load_x x9, 6 * portWORD_SIZE( sp ) /* s1 */
lw x10, 7 * portWORD_SIZE( sp ) /* a0 */ load_x x10, 7 * portWORD_SIZE( sp ) /* a0 */
lw x11, 8 * portWORD_SIZE( sp ) /* a1 */ load_x x11, 8 * portWORD_SIZE( sp ) /* a1 */
lw x12, 9 * portWORD_SIZE( sp ) /* a2 */ load_x x12, 9 * portWORD_SIZE( sp ) /* a2 */
lw x13, 10 * portWORD_SIZE( sp ) /* a3 */ load_x x13, 10 * portWORD_SIZE( sp ) /* a3 */
lw x14, 11 * portWORD_SIZE( sp ) /* a4 */ load_x x14, 11 * portWORD_SIZE( sp ) /* a4 */
lw x15, 12 * portWORD_SIZE( sp ) /* a5 */ load_x x15, 12 * portWORD_SIZE( sp ) /* a5 */
lw x16, 13 * portWORD_SIZE( sp ) /* a6 */ load_x x16, 13 * portWORD_SIZE( sp ) /* a6 */
lw x17, 14 * portWORD_SIZE( sp ) /* a7 */ load_x x17, 14 * portWORD_SIZE( sp ) /* a7 */
lw x18, 15 * portWORD_SIZE( sp ) /* s2 */ load_x x18, 15 * portWORD_SIZE( sp ) /* s2 */
lw x19, 16 * portWORD_SIZE( sp ) /* s3 */ load_x x19, 16 * portWORD_SIZE( sp ) /* s3 */
lw x20, 17 * portWORD_SIZE( sp ) /* s4 */ load_x x20, 17 * portWORD_SIZE( sp ) /* s4 */
lw x21, 18 * portWORD_SIZE( sp ) /* s5 */ load_x x21, 18 * portWORD_SIZE( sp ) /* s5 */
lw x22, 19 * portWORD_SIZE( sp ) /* s6 */ load_x x22, 19 * portWORD_SIZE( sp ) /* s6 */
lw x23, 20 * portWORD_SIZE( sp ) /* s7 */ load_x x23, 20 * portWORD_SIZE( sp ) /* s7 */
lw x24, 21 * portWORD_SIZE( sp ) /* s8 */ load_x x24, 21 * portWORD_SIZE( sp ) /* s8 */
lw x25, 22 * portWORD_SIZE( sp ) /* s9 */ load_x x25, 22 * portWORD_SIZE( sp ) /* s9 */
lw x26, 23 * portWORD_SIZE( sp ) /* s10 */ load_x x26, 23 * portWORD_SIZE( sp ) /* s10 */
lw x27, 24 * portWORD_SIZE( sp ) /* s11 */ load_x x27, 24 * portWORD_SIZE( sp ) /* s11 */
lw x28, 25 * portWORD_SIZE( sp ) /* t3 */ load_x x28, 25 * portWORD_SIZE( sp ) /* t3 */
lw x29, 26 * portWORD_SIZE( sp ) /* t4 */ load_x x29, 26 * portWORD_SIZE( sp ) /* t4 */
lw x30, 27 * portWORD_SIZE( sp ) /* t5 */ load_x x30, 27 * portWORD_SIZE( sp ) /* t5 */
lw x31, 28 * portWORD_SIZE( sp ) /* t6 */ load_x x31, 28 * portWORD_SIZE( sp ) /* t6 */
addi sp, sp, portCONTEXT_SIZE addi sp, sp, portCONTEXT_SIZE
ret ret
.endfunc .endfunc
@ -376,21 +386,21 @@ pxPortInitialiseStack:
or t0, t0, t1 /* Set MPIE and MPP bits in mstatus value. */ or t0, t0, t1 /* Set MPIE and MPP bits in mstatus value. */
addi a0, a0, -portWORD_SIZE addi a0, a0, -portWORD_SIZE
sw t0, 0(a0) /* mstatus onto the stack. */ store_x t0, 0(a0) /* mstatus onto the stack. */
addi a0, a0, -(22 * portWORD_SIZE) /* Space for registers x11-x31. */ addi a0, a0, -(22 * portWORD_SIZE) /* Space for registers x11-x31. */
sw a2, 0(a0) /* Task parameters (pvParameters parameter) goes into register X10/a0 on the stack. */ store_x a2, 0(a0) /* Task parameters (pvParameters parameter) goes into register X10/a0 on the stack. */
addi a0, a0, -(6 * portWORD_SIZE) /* Space for registers x5-x9. */ addi a0, a0, -(6 * portWORD_SIZE) /* Space for registers x5-x9. */
sw x0, 0(a0) /* Return address onto the stack, could be portTASK_RETURN_ADDRESS */ store_x x0, 0(a0) /* Return address onto the stack, could be portTASK_RETURN_ADDRESS */
addi t0, x0, portasmADDITIONAL_CONTEXT_SIZE /* The number of chip specific additional registers. */ addi t0, x0, portasmADDITIONAL_CONTEXT_SIZE /* The number of chip specific additional registers. */
chip_specific_stack_frame: /* First add any chip specific registers to the stack frame being created. */ chip_specific_stack_frame: /* First add any chip specific registers to the stack frame being created. */
beq t0, x0, 1f /* No more chip specific registers to save. */ beq t0, x0, 1f /* No more chip specific registers to save. */
addi a0, a0, -portWORD_SIZE /* Make space for chip specific register. */ addi a0, a0, -portWORD_SIZE /* Make space for chip specific register. */
sw x0, 0(a0) /* Give the chip specific register an initial value of zero. */ store_x x0, 0(a0) /* Give the chip specific register an initial value of zero. */
addi t0, t0, -1 /* Decrement the count of chip specific registers remaining. */ addi t0, t0, -1 /* Decrement the count of chip specific registers remaining. */
j chip_specific_stack_frame /* Until no more chip specific registers. */ j chip_specific_stack_frame /* Until no more chip specific registers. */
1: 1:
addi a0, a0, -portWORD_SIZE addi a0, a0, -portWORD_SIZE
sw a1, 0(a0) /* mret value (pxCode parameter) onto the stack. */ store_x a1, 0(a0) /* mret value (pxCode parameter) onto the stack. */
ret ret
.endfunc .endfunc
/*-----------------------------------------------------------*/ /*-----------------------------------------------------------*/

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