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target/ppc: Use qemu_guest_getrandom for DARN 

We now have an interface for guest visible random numbers.

Acked-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2019-03-14 14:46:41 -07:00
parent 7e4357f612
commit 3f74b6322c
1 changed files with 27 additions and 12 deletions
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39
target/ppc/int_helper.c
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@ -23,6 +23,8 @@
#include "exec/helper-proto.h"
#include "crypto/aes.h"
#include "fpu/softfloat.h"
#include "qapi/error.h"
#include "qemu/guest-random.h"
#include "helper_regs.h"
/*****************************************************************************/
@ -158,25 +160,38 @@ uint32_t helper_cmpeqb(target_ulong ra, target_ulong rb)
#undef hasvalue
/*
* Return invalid random number.
*
* FIXME: Add rng backend or other mechanism to get cryptographically suitable
* random number
* Return a random number.
*/
target_ulong helper_darn32(void)
uint64_t helper_darn32(void)
{
return -1;
Error *err = NULL;
uint32_t ret;
if (qemu_guest_getrandom(&ret, sizeof(ret), &err) < 0) {
qemu_log_mask(LOG_UNIMP, "darn: Crypto failure: %s",
error_get_pretty(err));
error_free(err);
return -1;
}
return ret;
}
target_ulong helper_darn64(void)
uint64_t helper_darn64(void)
{
return -1;
Error *err = NULL;
uint64_t ret;
if (qemu_guest_getrandom(&ret, sizeof(ret), &err) < 0) {
qemu_log_mask(LOG_UNIMP, "darn: Crypto failure: %s",
error_get_pretty(err));
error_free(err);
return -1;
}
return ret;
}
#endif
#if defined(TARGET_PPC64)
uint64_t helper_bpermd(uint64_t rs, uint64_t rb)
{
int i;