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113 lines
1.9 KiB
C
113 lines
1.9 KiB
C
// The OS/K Team licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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#include <pc/device.h>
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int dying = 0;
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void _except(ctx_t *ctx, int _code, char *fmt, ...)
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{
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va_list ap;
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ulong handler;
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uint code = _code;
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uint effcode;
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ulong orig_frame;
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trace("\nException %u - ", code);
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va_start(ap, fmt);
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vlog(fmt, ap);
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va_end(ap);
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trace("\n\n");
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//
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// Interrupted earlier?
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//
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if (dying)
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{
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logerr("Exception thrown while dying=1\n");
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enable_stdin_echoing();
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exit(-12);
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}
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if (code >= IDT_SLOTS || code == 1023)
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goto actually_die;
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//
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// Check for E/I handlers
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//
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if (idt[code] == 0)
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{
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if (code == E_DBF)
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effcode = E_DBF;
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else if (code < 512)
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effcode = 0;
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else if (code < 768)
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effcode = 512;
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else
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effcode = 768;
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}
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else
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effcode = code;
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handler = idt[effcode];
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// Found nothing?
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if (handler == 0)
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goto actually_die; // oh well
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// Is another handler already running?
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if (idt_handling[code] > 0)
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{
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// Triple fault?
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if (code == E_DBF)
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goto actually_die;
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// Double fault then?
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if (code < 512)
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_except(ctx, E_DBF, "Double Fault; previously handling: #%u", code);
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// Todo: queue INTs
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else
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goto actually_die;
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}
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// Is this a valid frame?
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if (rfs[handler] != NULL)
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{
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orig_frame = rfs_current_idx;
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ctx->rf = rfs[handler];
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rfs_current_idx = handler;
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fc2 = 0;
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R(R10) = code;
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R(R11) = effcode;
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R(R12) = orig_frame;
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R(R13) = rip;
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idt_handling[effcode]++;
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longjmp(exc_jmp_buf, code);
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__builtin_unreachable();
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}
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actually_die:
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dying = 1;
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dumpregs(ctx);
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trace("\n");
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die(code);
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}
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