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linux-user: Update MIPS specific prctl() implementation 

Perform needed checks before actual prctl() PR_SET_FP_MODE and
PR_GET_FP_MODE work based on kernel implementation. Also, update
necessary hflags.

Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Stefan Markovic <smarkovic@wavecomp.com>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
This commit is contained in:
Stefan Markovic 2018-11-14 14:37:08 +01:00 committed by Aleksandar Markovic
parent 83c496599c
commit 6456c51081
1 changed files with 18 additions and 0 deletions
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18
linux-user/syscall.c
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@ -9554,9 +9554,25 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
{
CPUMIPSState *env = ((CPUMIPSState *)cpu_env);
bool old_fr = env->CP0_Status & (1 << CP0St_FR);
bool old_fre = env->CP0_Config5 & (1 << CP0C5_FRE);
bool new_fr = arg2 & TARGET_PR_FP_MODE_FR;
bool new_fre = arg2 & TARGET_PR_FP_MODE_FRE;
const unsigned int known_bits = TARGET_PR_FP_MODE_FR |
TARGET_PR_FP_MODE_FRE;
/* If nothing to change, return right away, successfully. */
if (old_fr == new_fr && old_fre == new_fre) {
return 0;
}
/* Check the value is valid */
if (arg2 & ~known_bits) {
return -TARGET_EOPNOTSUPP;
}
/* Setting FRE without FR is not supported. */
if (new_fre && !new_fr) {
return -TARGET_EOPNOTSUPP;
}
if (new_fr && !(env->active_fpu.fcr0 & (1 << FCR0_F64))) {
/* FR1 is not supported */
return -TARGET_EOPNOTSUPP;
@ -9586,6 +9602,7 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
env->hflags |= MIPS_HFLAG_F64;
} else {
env->CP0_Status &= ~(1 << CP0St_FR);
env->hflags &= ~MIPS_HFLAG_F64;
}
if (new_fre) {
env->CP0_Config5 |= (1 << CP0C5_FRE);
@ -9594,6 +9611,7 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
}
} else {
env->CP0_Config5 &= ~(1 << CP0C5_FRE);
env->hflags &= ~MIPS_HFLAG_FRE;
}
return 0;