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lib: Add misaligned load/store trap handling

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We generally don't get misaligned load/store traps from Linux/U-Boot
compiled using GCC 8.2 or higher but this is not true with older
GCC toolchains. To tackle this we add misaligned load/store trap
handling adopted from BBL sources but much more simpler.
(Note: BBL sources can be found at https://github.com/riscv/riscv-pk.git)

Signed-off-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Anup Patel
2018-12-24 16:49:01 +05:30
committed by Anup Patel
parent 96f66f79ca
commit b5ae8e8a65
4 changed files with 166 additions and 1 deletions
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11
lib/sbi_trap.c
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@@ -12,9 +12,10 @@
#include <sbi/sbi_console.h>
#include <sbi/sbi_ecall.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_illegal_insn.h>
#include <sbi/sbi_hart.h>
#include <sbi/sbi_illegal_insn.h>
#include <sbi/sbi_ipi.h>
#include <sbi/sbi_misaligned_ldst.h>
#include <sbi/sbi_timer.h>
#include <sbi/sbi_trap.h>
@@ -95,6 +96,14 @@ void sbi_trap_handler(struct sbi_trap_regs *regs,
rc = sbi_illegal_insn_handler(hartid, mcause, regs, scratch);
msg = "illegal instruction handler failed";
break;
case CAUSE_MISALIGNED_LOAD:
rc = sbi_misaligned_load_handler(hartid, mcause, regs, scratch);
msg = "misaligned load handler failed";
break;
case CAUSE_MISALIGNED_STORE:
rc = sbi_misaligned_store_handler(hartid, mcause, regs, scratch);
msg = "misaligned store handler failed";
break;
case CAUSE_SUPERVISOR_ECALL:
case CAUSE_HYPERVISOR_ECALL:
rc = sbi_ecall_handler(hartid, mcause, regs, scratch);