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lib: Don't return any invalid error from SBI ecall

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We should only return valid error codes from SBI ecalls as
defined by the RISC-V SBI spec.

To achieve this:
1. We use SBI_Exxxx defines for OpenSBI internal errors with
   error values starting from -1000
2. We use SBI_ERR_xxxx defines for errors defined by SBI spec
3. We map some of the SBI_Exxxx defines to SBI_ERR_xxxx defines
   which are semantically same
4. We throw a error print and force return error code to
   SBI_ERR_FAILED in sbi_ecall_handler() if we see an invalid
   error code being returned to S-mode

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-06-10 18:39:53 +05:30
committed by Anup Patel
parent 9bd5f8f17d
commit 2314101989
5 changed files with 43 additions and 20 deletions
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8
lib/sbi/sbi_ecall.c
View File

@@ -7,6 +7,7 @@
* Anup Patel <anup.patel@wdc.com>
*/
#include <sbi/sbi_console.h>
#include <sbi/sbi_ecall.h>
#include <sbi/sbi_ecall_interface.h>
#include <sbi/sbi_error.h>
@@ -124,6 +125,13 @@ int sbi_ecall_handler(struct sbi_trap_regs *regs)
trap.epc = regs->mepc;
sbi_trap_redirect(regs, &trap);
} else {
if (ret < SBI_LAST_ERR) {
sbi_printf("%s: Invalid error %d for ext=0x%lx "
"func=0x%lx\n", __func__, ret,
extension_id, func_id);
ret = SBI_ERR_FAILED;
}
/*
* This function should return non-zero value only in case of
* fatal error. However, there is no good way to distinguish

2
lib/sbi/sbi_hart.c
View File

@@ -200,7 +200,7 @@ int sbi_hart_pmp_check_addr(struct sbi_scratch *scratch, unsigned long addr,
continue;
if (tempaddr <= addr && addr <= tempaddr + size)
if (!(prot & attr))
return SBI_INVALID_ADDR;
return SBI_EINVALID_ADDR;
}
return SBI_OK;

4
lib/sbi/sbi_hsm.c
View File

@@ -219,7 +219,7 @@ int sbi_hsm_hart_start(struct sbi_scratch *scratch, u32 hartid,
hstate = atomic_cmpxchg(&hdata->state, SBI_HART_STOPPED,
SBI_HART_STARTING);
if (hstate == SBI_HART_STARTED)
return SBI_EALREADY_STARTED;
return SBI_EALREADY;
/**
* if a hart is already transition to start or stop, another start call
@@ -263,7 +263,7 @@ int sbi_hsm_hart_stop(struct sbi_scratch *scratch, bool exitnow)
if (oldstate != SBI_HART_STARTED) {
sbi_printf("%s: ERR: The hart is in invalid state [%u]\n",
__func__, oldstate);
return SBI_DENIED;
return SBI_EDENIED;
}
if (exitnow)