1 /*
2 * Copyright 2022-2023, Haiku Inc. All rights reserved.
3 * Distributed under the terms of the MIT License.
4 *
5 * Copyright 2009, Johannes Wischert, johanneswi@gmail.com.
6 * Distributed under the terms of the MIT License.
7 */
8
9
10 #include <commpage.h>
11
12 #include <string.h>
13
14 #include <KernelExport.h>
15
16 #include <cpu.h>
17 #include <elf.h>
18 #include <smp.h>
19
20 #include "syscall_numbers.h"
21
22
23 extern "C" void arch_user_thread_exit();
24
25
26 extern "C" void __attribute__((noreturn))
arch_user_signal_handler(signal_frame_data * data)27 arch_user_signal_handler(signal_frame_data* data)
28 {
29 if (data->siginfo_handler) {
30 auto handler = (void (*)(int, siginfo_t*, void*, void*))data->handler;
31 handler(data->info.si_signo, &data->info, &data->context, data->user_data);
32 } else {
33 auto handler = (void (*)(int, void*, vregs*))data->handler;
34 handler(data->info.si_signo, data->user_data, &data->context.uc_mcontext);
35 }
36
37 // _kern_restore_signal_frame(data)
38 asm volatile(
39 "mov r0, %[data];"
40 "svc %[syscall_num]"
41 :: [data] "r"(data), [syscall_num] "i" (SYSCALL_RESTORE_SIGNAL_FRAME)
42 );
43
44 __builtin_unreachable();
45 }
46
47
48 static void
register_commpage_function(const char * functionName,int32 commpageIndex,const char * commpageSymbolName,addr_t expectedAddress)49 register_commpage_function(const char* functionName, int32 commpageIndex,
50 const char* commpageSymbolName, addr_t expectedAddress)
51 {
52 // get address and size of function
53 elf_symbol_info symbolInfo;
54 if (elf_lookup_kernel_symbol(functionName, &symbolInfo) != B_OK) {
55 panic("register_commpage_function(): Failed to find "
56 "function \"%s\"!", functionName);
57 }
58
59 ASSERT(expectedAddress == symbolInfo.address);
60
61 // fill in the commpage table entry
62 addr_t position = fill_commpage_entry(commpageIndex,
63 (void*)symbolInfo.address, symbolInfo.size);
64
65 // add symbol to the commpage image
66 image_id image = get_commpage_image();
67 elf_add_memory_image_symbol(image, commpageSymbolName, position,
68 symbolInfo.size, B_SYMBOL_TYPE_TEXT);
69 }
70
71
72 status_t
arch_commpage_init(void)73 arch_commpage_init(void)
74 {
75 return B_OK;
76 }
77
78
79 status_t
arch_commpage_init_post_cpus(void)80 arch_commpage_init_post_cpus(void)
81 {
82 register_commpage_function("arch_user_signal_handler",
83 COMMPAGE_ENTRY_ARM_SIGNAL_HANDLER, "commpage_signal_handler",
84 (addr_t)&arch_user_signal_handler);
85
86 register_commpage_function("arch_user_thread_exit",
87 COMMPAGE_ENTRY_ARM_THREAD_EXIT, "commpage_thread_exit",
88 (addr_t)&arch_user_thread_exit);
89
90 return B_OK;
91 }
92