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bsd-user/arm/signal.c: get_mcontext should zero vfp data 

FreeBSD's get_mcontext doesn't return any vfp data. Instead, it zeros
out the vfp feilds (and all the spare fields). Impelement this
behavior. We're still missing the sysarch(ARM_GET_VFPCONTEXT) syscall,
though.

Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Warner Losh 2022-01-24 01:29:53 -07:00
parent 224474622e
commit 7f96d0a93c
1 changed files with 9 additions and 0 deletions
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9
bsd-user/arm/signal.c
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@ -109,6 +109,15 @@ abi_long get_mcontext(CPUARMState *env, target_mcontext_t *mcp, int flags)
gr[TARGET_REG_LR] = tswap32(env->regs[14]);
gr[TARGET_REG_PC] = tswap32(env->regs[15]);
/*
* FreeBSD's get_mcontext doesn't save VFP info, but sets the pointer and
* size to zero. Applications that need the VFP state use
* sysarch(ARM_GET_VFPSTATE) and are expected to adjust mcontext after that.
*/
mcp->mc_vfp_size = 0;
mcp->mc_vfp_ptr = 0;
memset(&mcp->mc_spare, 0, sizeof(mcp->mc_spare));
return 0;
}