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bsd-user/arm/signal.c: arm set_mcontext

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Move the machine context to the CPU state.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Kyle Evans <kevans@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Warner Losh 2021-09-23 15:23:13 -06:00
parent 38ce1471c9
commit d6d4509a9f
1 changed files with 76 additions and 0 deletions
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76
bsd-user/arm/signal.c
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@ -109,3 +109,79 @@ abi_long get_mcontext(CPUARMState *env, target_mcontext_t *mcp, int flags)
} }
return err; return err;
} }
/* Compare to arm/arm/exec_machdep.c set_mcontext() */
abi_long set_mcontext(CPUARMState *env, target_mcontext_t *mcp, int srflag)
{
int err = 0;
const uint32_t *gr = mcp->__gregs;
uint32_t cpsr, ccpsr = cpsr_read(env);
uint32_t fpscr, mask;
cpsr = tswap32(gr[TARGET_REG_CPSR]);
/*
* Only allow certain bits to change, reject attempted changes to non-user
* bits. In addition, make sure we're headed for user mode and none of the
* interrupt bits are set.
*/
if ((ccpsr & ~CPSR_USER) != (cpsr & ~CPSR_USER)) {
return -TARGET_EINVAL;
}
if ((cpsr & CPSR_M) != ARM_CPU_MODE_USR ||
(cpsr & (CPSR_I | CPSR_F)) != 0) {
return -TARGET_EINVAL;
}
/*
* The movs pc,lr instruction that implements the return to userland masks
* these bits out.
*/
mask = cpsr & CPSR_T ? 0x1 : 0x3;
/*
* Make sure that we either have no vfp, or it's the correct size.
* FreeBSD just ignores it, though, so maybe we'll need to adjust
* things below instead.
*/
if (mcp->mc_vfp_size != 0 && mcp->mc_vfp_size != sizeof(target_mcontext_vfp_t)) {
return -TARGET_EINVAL;
}
env->regs[0] = tswap32(gr[TARGET_REG_R0]);
env->regs[1] = tswap32(gr[TARGET_REG_R1]);
env->regs[2] = tswap32(gr[TARGET_REG_R2]);
env->regs[3] = tswap32(gr[TARGET_REG_R3]);
env->regs[4] = tswap32(gr[TARGET_REG_R4]);
env->regs[5] = tswap32(gr[TARGET_REG_R5]);
env->regs[6] = tswap32(gr[TARGET_REG_R6]);
env->regs[7] = tswap32(gr[TARGET_REG_R7]);
env->regs[8] = tswap32(gr[TARGET_REG_R8]);
env->regs[9] = tswap32(gr[TARGET_REG_R9]);
env->regs[10] = tswap32(gr[TARGET_REG_R10]);
env->regs[11] = tswap32(gr[TARGET_REG_R11]);
env->regs[12] = tswap32(gr[TARGET_REG_R12]);
env->regs[13] = tswap32(gr[TARGET_REG_SP]);
env->regs[14] = tswap32(gr[TARGET_REG_LR]);
env->regs[15] = tswap32(gr[TARGET_REG_PC] & ~mask);
if (mcp->mc_vfp_size != 0 && mcp->mc_vfp_ptr != 0) {
/* see set_vfpcontext in sys/arm/arm/exec_machdep.c */
target_mcontext_vfp_t *vfp;
vfp = lock_user(VERIFY_READ, mcp->mc_vfp_ptr, sizeof(*vfp), 1);
for (int i = 0; i < 32; i++) {
__get_user(*aa32_vfp_dreg(env, i), &vfp->mcv_reg[i]);
}
__get_user(fpscr, &vfp->mcv_fpscr);
vfp_set_fpscr(env, fpscr);
unlock_user(vfp, mcp->mc_vfp_ptr, sizeof(target_ucontext_t));
/*
* linux-user sets fpexc, fpinst and fpinst2, but these aren't in
* FreeBSD's mcontext, what to do?
*/
}
cpsr_write(env, cpsr, CPSR_USER | CPSR_EXEC, CPSRWriteByInstr);
return err;
}