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[PATCH v2 10/30] bsd-user/arm/target_arch_cpu.h: Implement system call d
From: |
Warner Losh |
Subject: |
[PATCH v2 10/30] bsd-user/arm/target_arch_cpu.h: Implement system call dispatch |
Date: |
Tue, 2 Nov 2021 16:52:28 -0600 |
Implement the system call dispatch. This implements all three kinds of
system call: direct and the two indirect variants. It handles all the
special cases for thumb as well.
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: Kyle Evans <kevans@FreeBSD.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
bsd-user/arm/target_arch_cpu.h | 94 ++++++++++++++++++++++++++++++++++
1 file changed, 94 insertions(+)
diff --git a/bsd-user/arm/target_arch_cpu.h b/bsd-user/arm/target_arch_cpu.h
index cdb9440a65..e784c103a0 100644
--- a/bsd-user/arm/target_arch_cpu.h
+++ b/bsd-user/arm/target_arch_cpu.h
@@ -40,6 +40,7 @@ static inline void target_cpu_loop(CPUARMState *env)
{
int trapnr;
target_siginfo_t info;
+ unsigned int n;
CPUState *cs = env_cpu(env);
for (;;) {
@@ -87,6 +88,99 @@ static inline void target_cpu_loop(CPUARMState *env)
}
}
break;
+ case EXCP_SWI:
+ case EXCP_BKPT:
+ {
+ /*
+ * system call
+ * See arm/arm/trap.c cpu_fetch_syscall_args()
+ */
+ if (trapnr == EXCP_BKPT) {
+ if (env->thumb) {
+ env->regs[15] += 2;
+ } else {
+ env->regs[15] += 4;
+ }
+ }
+ n = env->regs[7];
+ if (bsd_type == target_freebsd) {
+ int ret;
+ abi_ulong params = get_sp_from_cpustate(env);
+ int32_t syscall_nr = n;
+ int32_t arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8;
+
+ /* See arm/arm/trap.c cpu_fetch_syscall_args() */
+ if (syscall_nr == TARGET_FREEBSD_NR_syscall) {
+ syscall_nr = env->regs[0];
+ arg1 = env->regs[1];
+ arg2 = env->regs[2];
+ arg3 = env->regs[3];
+ get_user_s32(arg4, params);
+ params += sizeof(int32_t);
+ get_user_s32(arg5, params);
+ params += sizeof(int32_t);
+ get_user_s32(arg6, params);
+ params += sizeof(int32_t);
+ get_user_s32(arg7, params);
+ arg8 = 0;
+ } else if (syscall_nr == TARGET_FREEBSD_NR___syscall) {
+ syscall_nr = env->regs[0];
+ arg1 = env->regs[2];
+ arg2 = env->regs[3];
+ get_user_s32(arg3, params);
+ params += sizeof(int32_t);
+ get_user_s32(arg4, params);
+ params += sizeof(int32_t);
+ get_user_s32(arg5, params);
+ params += sizeof(int32_t);
+ get_user_s32(arg6, params);
+ arg7 = 0;
+ arg8 = 0;
+ } else {
+ arg1 = env->regs[0];
+ arg2 = env->regs[1];
+ arg3 = env->regs[2];
+ arg4 = env->regs[3];
+ get_user_s32(arg5, params);
+ params += sizeof(int32_t);
+ get_user_s32(arg6, params);
+ params += sizeof(int32_t);
+ get_user_s32(arg7, params);
+ params += sizeof(int32_t);
+ get_user_s32(arg8, params);
+ }
+ ret = do_freebsd_syscall(env, syscall_nr, arg1, arg2, arg3,
+ arg4, arg5, arg6, arg7, arg8);
+ /*
+ * Compare to arm/arm/vm_machdep.c
+ * cpu_set_syscall_retval()
+ */
+ if (-TARGET_EJUSTRETURN == ret) {
+ /*
+ * Returning from a successful sigreturn syscall.
+ * Avoid clobbering register state.
+ */
+ break;
+ }
+ if (-TARGET_ERESTART == ret) {
+ env->regs[15] -= env->thumb ? 2 : 4;
+ break;
+ }
+ if ((unsigned int)ret >= (unsigned int)(-515)) {
+ ret = -ret;
+ cpsr_write(env, CPSR_C, CPSR_C, CPSRWriteByInstr);
+ env->regs[0] = ret;
+ } else {
+ cpsr_write(env, 0, CPSR_C, CPSRWriteByInstr);
+ env->regs[0] = ret; /* XXX need to handle lseek()? */
+ /* env->regs[1] = 0; */
+ }
+ } else {
+ fprintf(stderr, "qemu: bsd_type (= %d) syscall "
+ "not supported\n", bsd_type);
+ }
+ }
+ break;
case EXCP_INTERRUPT:
/* just indicate that signals should be handled asap */
break;
--
2.33.0
- [PATCH v2 04/30] bsd-user/arm/target_arch_cpu.c: Target specific TLS routines, (continued)
- [PATCH v2 04/30] bsd-user/arm/target_arch_cpu.c: Target specific TLS routines, Warner Losh, 2021/11/02
- [PATCH v2 05/30] bsd-user/arm/target_arch_cpu.h: CPU Loop definitions, Warner Losh, 2021/11/02
- [PATCH v2 06/30] bsd-user/arm/target_arch_cpu.h: Implement target_cpu_clone_regs, Warner Losh, 2021/11/02
- [PATCH v2 11/30] bsd-user/arm/target_arch_reg.h: Implement core dump register copying, Warner Losh, 2021/11/02
- [PATCH v2 07/30] bsd-user/arm/target_arch_cpu.h: Dummy target_cpu_loop implementation, Warner Losh, 2021/11/02
- [PATCH v2 09/30] bsd-user/arm/target_arch_cpu.h: Implement data abort exceptions, Warner Losh, 2021/11/02
- [PATCH v2 08/30] bsd-user/arm/target_arch_cpu.h: Implement trivial EXCP exceptions, Warner Losh, 2021/11/02
- [PATCH v2 10/30] bsd-user/arm/target_arch_cpu.h: Implement system call dispatch,
Warner Losh <=
- [PATCH v2 12/30] bsd-user/arm/target_arch_vmparam.h: Parameters for arm address space, Warner Losh, 2021/11/02
- [PATCH v2 13/30] bsd-user/arm/target_arch_sigtramp.h: Signal Trampoline for arm, Warner Losh, 2021/11/02
- [PATCH v2 14/30] bsd-user/arm/target_arch_thread.h: Routines to create and switch to a thread, Warner Losh, 2021/11/02
- [PATCH v2 15/30] bsd-user/arm/target_arch_elf.h: arm defines for ELF, Warner Losh, 2021/11/02
- [PATCH v2 17/30] bsd-user/arm/target_arch_elf.h: arm get_hwcap2 impl, Warner Losh, 2021/11/02
- [PATCH v2 19/30] bsd-user/arm/target_arch_signal.h: arm specific signal registers and stack, Warner Losh, 2021/11/02
- [PATCH v2 18/30] bsd-user/freebsd: Create common target_os_ucontext.h file, Warner Losh, 2021/11/02