1 // SPDX-License-Identifier: GPL-2.0+
4 * Kamil Lulko, <kamil.lulko@gmail.com>
10 * Upon exception entry ARMv7-M processors automatically save stack
11 * frames containing some registers. For simplicity initial
12 * implementation uses only this auto-saved stack frame.
13 * This does not contain complete register set dump,
14 * only R0-R3, R12, LR, PC and xPSR are saved.
17 struct autosave_regs {
21 #define ARM_XPSR uregs[7]
22 #define ARM_PC uregs[6]
23 #define ARM_LR uregs[5]
24 #define ARM_R12 uregs[4]
25 #define ARM_R3 uregs[3]
26 #define ARM_R2 uregs[2]
27 #define ARM_R1 uregs[1]
28 #define ARM_R0 uregs[0]
30 int interrupt_init(void)
35 void enable_interrupts(void)
40 int disable_interrupts(void)
45 void dump_regs(struct autosave_regs *regs)
47 printf("pc : %08lx lr : %08lx xPSR : %08lx\n",
48 regs->ARM_PC, regs->ARM_LR, regs->ARM_XPSR);
49 printf("r12 : %08lx r3 : %08lx r2 : %08lx\n"
50 "r1 : %08lx r0 : %08lx\n",
51 regs->ARM_R12, regs->ARM_R3, regs->ARM_R2,
52 regs->ARM_R1, regs->ARM_R0);
57 panic("Resetting CPU ...\n");
61 void do_hard_fault(struct autosave_regs *autosave_regs)
63 printf("Hard fault\n");
64 dump_regs(autosave_regs);
68 void do_mm_fault(struct autosave_regs *autosave_regs)
70 printf("Memory management fault\n");
71 dump_regs(autosave_regs);
75 void do_bus_fault(struct autosave_regs *autosave_regs)
77 printf("Bus fault\n");
78 dump_regs(autosave_regs);
82 void do_usage_fault(struct autosave_regs *autosave_regs)
84 printf("Usage fault\n");
85 dump_regs(autosave_regs);
89 void do_invalid_entry(struct autosave_regs *autosave_regs)
91 printf("Exception\n");
92 dump_regs(autosave_regs);