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lib: sbi_trap: Allow M-mode to M-mode ECALLs

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We should allow M-mode to M-mode ECALLs because:
1. No other mode can handle M-mode ECALLs
2. In future, we can allow M-mode baremetal application (not
   linked to OpenSBI) running independently and cooperatively
   without corrupting OpenSBI M-mode state (CSRs and memory).

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-09-04 16:39:49 +05:30
committed by Anup Patel
parent bef63d6848
commit c1c7c3ee9e
1 changed files with 1 additions and 0 deletions
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lib/sbi/sbi_trap.c
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@@ -252,6 +252,7 @@ void sbi_trap_handler(struct sbi_trap_regs *regs)
msg = "misaligned store handler failed"; msg = "misaligned store handler failed";
break; break;
case CAUSE_SUPERVISOR_ECALL: case CAUSE_SUPERVISOR_ECALL:
case CAUSE_MACHINE_ECALL:
rc = sbi_ecall_handler(regs); rc = sbi_ecall_handler(regs);
msg = "ecall handler failed"; msg = "ecall handler failed";
break; break;