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bsd-user:Add get_mcontext function for ARM AArch64 

function to retrieve machine context,it populates the provided
target_mcontext_t structure with information from the CPUARMState
registers.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Ajeet Singh <itachis@FreeBSD.org>
Co-authored-by: Kyle Evans <kevans@FreeBSD.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240707191128.10509-6-itachis@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
This commit is contained in:
Stacey Son 2024-07-08 00:41:25 +05:30 committed by Warner Losh
parent 7dba5e10a6
commit 9959fae592
1 changed files with 30 additions and 0 deletions
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30
bsd-user/aarch64/signal.c
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@ -51,3 +51,33 @@ abi_long set_sigtramp_args(CPUARMState *regs, int sig,
return 0;
}
/*
* Compare to get_mcontext() in arm64/arm64/machdep.c
* Assumes that the memory is locked if mcp points to user memory.
*/
abi_long get_mcontext(CPUARMState *regs, target_mcontext_t *mcp, int flags)
{
int err = 0, i;
uint64_t *gr = mcp->mc_gpregs.gp_x;
mcp->mc_gpregs.gp_spsr = pstate_read(regs);
if (flags & TARGET_MC_GET_CLEAR_RET) {
gr[0] = 0UL;
mcp->mc_gpregs.gp_spsr &= ~CPSR_C;
} else {
gr[0] = tswap64(regs->xregs[0]);
}
for (i = 1; i < 30; i++) {
gr[i] = tswap64(regs->xregs[i]);
}
mcp->mc_gpregs.gp_sp = tswap64(regs->xregs[TARGET_REG_SP]);
mcp->mc_gpregs.gp_lr = tswap64(regs->xregs[TARGET_REG_LR]);
mcp->mc_gpregs.gp_elr = tswap64(regs->pc);
/* XXX FP? */
return err;
}