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| author | Jonathan Neuschäfer <j.neuschaefer@gmx.net> | 2016-08-22 19:37:15 +0200 |
|---|---|---|
| committer | Ronald G. Minnich <rminnich@gmail.com> | 2016-08-23 23:43:24 +0200 |
| commit | b6648cd888f1ba8e0e81c59f296028ba831c6eae (patch) | |
| tree | 682cfc84a95cb4146261ee2a754f7390c84f3bae /src/arch/riscv/trap_handler.c | |
| parent | 85b1aadcc1f0cec7eef73a527c5131fb3b1c2f95 (diff) | |
arch/riscv: Fix unaligned memory access emulation
Change-Id: I06c6493355f25f3780f75e345c517b434912696f
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/16261
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'src/arch/riscv/trap_handler.c')
| -rw-r--r-- | src/arch/riscv/trap_handler.c | 32 |
1 files changed, 20 insertions, 12 deletions
diff --git a/src/arch/riscv/trap_handler.c b/src/arch/riscv/trap_handler.c index 9f3f07f830..d8ac784c27 100644 --- a/src/arch/riscv/trap_handler.c +++ b/src/arch/riscv/trap_handler.c @@ -14,10 +14,11 @@ * GNU General Public License for more details. */ -#include <console/console.h> #include <arch/exception.h> +#include <console/console.h> #include <spike_util.h> #include <string.h> +#include <vm.h> #define HART_ID 0 #define CONSOLE_PUT 1 @@ -171,14 +172,16 @@ void trap_handler(trapframe *tf) { die("Can't recover from trap. Halting.\n"); } +static uint32_t fetch_instruction(uintptr_t vaddr) { + printk(BIOS_SPEW, "fetching instruction at 0x%016zx\n", (size_t)vaddr); + return mprv_read_u32((uint32_t *) vaddr); +} + void handle_misaligned_load(trapframe *tf) { printk(BIOS_DEBUG, "Trapframe ptr: %p\n", tf); printk(BIOS_DEBUG, "Stored sp: %p\n", (void*) tf->gpr[2]); - insn_t faultingInstruction = 0; uintptr_t faultingInstructionAddr = tf->epc; - asm("move t0, %0" : /* No outputs */ : "r"(faultingInstructionAddr)); - asm("lw t0, 0(t0)"); - asm("move %0, t0" : "=r"(faultingInstruction)); + insn_t faultingInstruction = fetch_instruction(faultingInstructionAddr); printk(BIOS_DEBUG, "Faulting instruction: 0x%x\n", faultingInstruction); insn_t widthMask = 0x7000; insn_t memWidth = (faultingInstruction & widthMask) >> 12; @@ -188,7 +191,12 @@ void handle_misaligned_load(trapframe *tf) { if (memWidth == 3) { // load double, handle the issue void* badAddress = (void*) tf->badvaddr; - memcpy(&(tf->gpr[destRegister]), badAddress, 8); + uint64_t value = 0; + for (int i = 0; i < 8; i++) { + value <<= 8; + value += mprv_read_u8(badAddress+i); + } + tf->gpr[destRegister] = value; } else { // panic, this should not have happened printk(BIOS_DEBUG, "Code should not reach this path, misaligned on a non-64 bit store/load\n"); @@ -203,11 +211,8 @@ void handle_misaligned_load(trapframe *tf) { void handle_misaligned_store(trapframe *tf) { printk(BIOS_DEBUG, "Trapframe ptr: %p\n", tf); printk(BIOS_DEBUG, "Stored sp: %p\n", (void*) tf->gpr[2]); - insn_t faultingInstruction = 0; uintptr_t faultingInstructionAddr = tf->epc; - asm("move t0, %0" : /* No outputs */ : "r"(faultingInstructionAddr)); - asm("lw t0, 0(t0)"); - asm("move %0, t0" : "=r"(faultingInstruction)); + insn_t faultingInstruction = fetch_instruction(faultingInstructionAddr); printk(BIOS_DEBUG, "Faulting instruction: 0x%x\n", faultingInstruction); insn_t widthMask = 0x7000; insn_t memWidth = (faultingInstruction & widthMask) >> 12; @@ -217,8 +222,11 @@ void handle_misaligned_store(trapframe *tf) { if (memWidth == 3) { // store double, handle the issue void* badAddress = (void*) tf->badvaddr; - long valueToStore = tf->gpr[srcRegister]; - memcpy(badAddress, &valueToStore, 8); + uint64_t value = tf->gpr[srcRegister]; + for (int i = 0; i < 8; i++) { + mprv_write_u8(badAddress+i, value); + value >>= 8; + } } else { // panic, this should not have happened printk(BIOS_DEBUG, "Code should not reach this path, misaligned on a non-64 bit store/load\n"); |