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bsd-user:Add set_mcontext function for ARM AArch64 

The function copies register values from the provided target_mcontext_t
structure to the CPUARMState registers.
Note:FP is unfinished upstream but will be a separate commit coming soon.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Ajeet Singh <itachis@FreeBSD.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240707191128.10509-8-itachis@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
This commit is contained in:
Stacey Son 2024-07-08 00:41:27 +05:30 committed by Warner Losh
parent c88f44d85a
commit dadfc6d5df
1 changed files with 22 additions and 0 deletions
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22
bsd-user/aarch64/signal.c
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@ -95,3 +95,25 @@ abi_long setup_sigframe_arch(CPUARMState *env, abi_ulong frame_addr,
return 0;
}
/*
* Compare to set_mcontext() in arm64/arm64/machdep.c
* Assumes that the memory is locked if frame points to user memory.
*/
abi_long set_mcontext(CPUARMState *regs, target_mcontext_t *mcp, int srflag)
{
int err = 0, i;
const uint64_t *gr = mcp->mc_gpregs.gp_x;
for (i = 0; i < 30; i++) {
regs->xregs[i] = tswap64(gr[i]);
}
regs->xregs[TARGET_REG_SP] = tswap64(mcp->mc_gpregs.gp_sp);
regs->xregs[TARGET_REG_LR] = tswap64(mcp->mc_gpregs.gp_lr);
regs->pc = mcp->mc_gpregs.gp_elr;
pstate_write(regs, mcp->mc_gpregs.gp_spsr);
/* XXX FP? */
return err;
}