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Support reading registers r0-r3 when unwinding. There is a seperate

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instruction to load these. We only hit it when unwinding past an trap frame
as in C r0-r3 would never have been saved onto the stack.
This commit is contained in:
Andrew Turner 2013-06-27 22:26:56 +00:00
parent e35ce1f271
commit 19d8e1c74a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=252320
1 changed files with 19 additions and 0 deletions
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19
sys/arm/arm/db_trace.c
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@ -108,6 +108,7 @@ extern int extab_start, extab_end, exidx_start, exidx_end;
#define INSN_VSP_REG 0x90
#define INSN_POP_COUNT 0xa0
#define INSN_FINISH 0xb0
#define INSN_POP_REGS 0xb1
#define INSN_VSP_LARGE_INC 0xb2
/* An item in the exception index table */
@ -268,6 +269,24 @@ db_unwind_exec_insn(struct unwind_state *state)
/* Stop processing */
state->entries = 0;
} else if ((insn == INSN_POP_REGS)) {
unsigned int mask, reg;
mask = db_unwind_exec_read_byte(state);
if (mask == 0 || (mask & 0xf0) != 0)
return 1;
/* Update SP */
update_vsp = 1;
/* Load the registers */
for (reg = 0; mask && reg < 4; mask >>= 1, reg++) {
if (mask & 1) {
state->registers[reg] = *vsp++;
state->update_mask |= 1 << reg;
}
}
} else if ((insn & INSN_VSP_LARGE_INC_MASK) == INSN_VSP_LARGE_INC) {
unsigned int uleb128;