Subversion Repositories HelenOS-historic

Rev

Rev 959 | Rev 1100 | Go to most recent revision | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 959 Rev 1096
Line 127... Line 127...
127 
    for (i = 0; i < 8; i++)
 127 
    for (i = 0; i < 8; i++)
128 
        if (cause & (1 << i))
 128 
        if (cause & (1 << i))
129 
            exc_dispatch(i+INT_OFFSET, istate);
 129 
            exc_dispatch(i+INT_OFFSET, istate);
130 
}
 130 
}
131 
 
 131 
 
132 
#include <debug.h>
 - 
 
133 
/** Handle syscall userspace call */
 132 
__native syscall_handler(__native a0, __native a1, __native a2,
134 
static void syscall_exception(int n, istate_t *istate)
 133 
             __native a3, __native sysnum)
135 
{
 134 
{
136 
    interrupts_enable();
 - 
 
137 
    if (istate->t0 < SYSCALL_END)
 135 
    if (sysnum < SYSCALL_END)
138 
        istate->v0 = syscall_table[istate->t0](istate->a0,
 136 
        return syscall_table[sysnum](a0,a1,a2,a3);
139 
                               istate->a1,
 - 
 
140 
                               istate->a2,
 - 
 
141 
                               istate->a3);
 - 
 
142 
    else
 - 
 
143 
        panic("Undefined syscall %d", istate->a3);
 137 
    panic("Undefined syscall %d", sysnum);
144 
    istate->epc += 4;
 - 
 
145 
    interrupts_disable();
 - 
 
146 
}
 138 
}
147 
 
 139 
 
- 
 
 140 
/** Handle syscall userspace call */
148 
void exception(istate_t *istate)
 141 
static void syscall_exception(int n, istate_t *istate)
149 
{
 142 
{
150 
    int cause;
 - 
 
151 
    int excno;
 - 
 
152 
 
 - 
 
153 
    ASSERT(CPU != NULL);
 - 
 
154 
 
 - 
 
155 
    /*
 - 
 
156 
     * NOTE ON OPERATION ORDERING
 - 
 
157 
     *
 - 
 
158 
     * On entry, interrupts_disable() must be called before
 - 
 
159 
     * exception bit is cleared.
 - 
 
160 
     */
 - 
 
161 
 
 - 
 
162 
    interrupts_disable();
 - 
 
163 
    cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit |
 - 
 
164 
                        cp0_status_um_bit));
 - 
 
165 
 
 - 
 
166 
    /* Save istate so that the threads can access it */
 143 
    panic("Syscall is handled through shortcut");
167 
    /* If THREAD->istate is set, this is nested exception,
 - 
 
168 
     * do not rewrite it
 - 
 
169 
     */
 - 
 
170 
    if (THREAD && !THREAD->istate)
 - 
 
171 
        THREAD->istate = istate;
 - 
 
172 
 
 - 
 
173 
    cause = cp0_cause_read();
 - 
 
174 
    excno = cp0_cause_excno(cause);
 - 
 
175 
    /* Dispatch exception */
 - 
 
176 
    exc_dispatch(excno, istate);
 - 
 
177 
 
 - 
 
178 
    /* Set to NULL, so that we can still support nested
 - 
 
179 
     * exceptions
 - 
 
180 
     * TODO: We should probably set EXL bit before this command,
 - 
 
181 
     * nesting. On the other hand, if some exception occurs between
 - 
 
182 
     * here and ERET, it won't set anything on the istate anyway.
 - 
 
183 
     */
 - 
 
184 
    if (THREAD)
 - 
 
185 
        THREAD->istate = NULL;
 - 
 
186 
}
 144 
}
187 
 
 145 
 
188 
void exception_init(void)
 146 
void exception_init(void)
189 
{
 147 
{
190 
    int i;
 148 
    int i;