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lib: sbi: fwft: implement landing pad and shadow stack fwft interface

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Supervisor software can enable control flow integrity features for itself
using fwft feature `SBI_FWFT_LANDING_PAD` and `SBI_FWFT_SHADOW_STACK`.
This patch implements the mechanism to enable both these fwft.

Signed-off-by: Deepak Gupta <debug@rivosinc.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Clément Léger <cleger@rivosinc.com>
This commit is contained in:
Deepak Gupta
2024-09-16 11:23:57 -07:00
committed by Anup Patel
parent 110524441a
commit 7179e36ce7
1 changed files with 74 additions and 0 deletions
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74
lib/sbi/sbi_fwft.c
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@@ -146,6 +146,68 @@ static int fwft_get_adue(struct fwft_config *conf, unsigned long *value)
return SBI_OK;
}
static int fwft_lpad_supported(struct fwft_config *conf)
{
if (!sbi_hart_has_extension(sbi_scratch_thishart_ptr(),
SBI_HART_EXT_ZICFILP))
return SBI_ENOTSUPP;
return SBI_OK;
}
static int fwft_enable_lpad(struct fwft_config *conf, unsigned long value)
{
if (value == 1)
csr_set(CSR_MENVCFG, ENVCFG_LPE);
else if (value == 0)
csr_clear(CSR_MENVCFG, ENVCFG_LPE);
else
return SBI_EINVAL;
return SBI_OK;
}
static int fwft_get_lpad(struct fwft_config *conf, unsigned long *value)
{
unsigned long cfg;
cfg = csr_read(CSR_MENVCFG) & ENVCFG_LPE;
*value = cfg != 0;
return SBI_OK;
}
static int fwft_sstack_supported(struct fwft_config *conf)
{
if (!sbi_hart_has_extension(sbi_scratch_thishart_ptr(),
SBI_HART_EXT_ZICFISS))
return SBI_ENOTSUPP;
return SBI_OK;
}
static int fwft_enable_sstack(struct fwft_config *conf, unsigned long value)
{
if (value == 1)
csr_set(CSR_MENVCFG, ENVCFG_SSE);
else if (value == 0)
csr_clear(CSR_MENVCFG, ENVCFG_SSE);
else
return SBI_EINVAL;
return SBI_OK;
}
static int fwft_get_sstack(struct fwft_config *conf, unsigned long *value)
{
unsigned long cfg;
cfg = csr_read(CSR_MENVCFG) & ENVCFG_SSE;
*value = cfg != 0;
return SBI_OK;
}
#if __riscv_xlen > 32
static int fwft_pmlen_supported(struct fwft_config *conf)
{
@@ -289,6 +351,18 @@ static const struct fwft_feature features[] =
.set = fwft_set_misaligned_delegation,
.get = fwft_get_misaligned_delegation,
},
{
.id = SBI_FWFT_LANDING_PAD,
.supported = fwft_lpad_supported,
.set = fwft_enable_lpad,
.get = fwft_get_lpad,
},
{
.id = SBI_FWFT_SHADOW_STACK,
.supported = fwft_sstack_supported,
.set = fwft_enable_sstack,
.get = fwft_get_sstack,
},
{
.id = SBI_FWFT_PTE_AD_HW_UPDATING,
.supported = fwft_adue_supported,