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ARC: show_regs: fix r12 printing and simplify 

when working on ARC64, spotted an issue in ARCv2 reg file printing.
print_reg_file() assumes contiguous reg-file whereas in ARCv2 they are
not: r12 comes before r0-r11 due to hardware auto-save. Apparently this
issue has been present since v2 port submission.

To avoid bolting hacks for this discontinuity while looping through
pt_regs, just ditching the loop and print pt_regs directly.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2020-08-07 21:29:28 -07:00
parent fe81d927b7
commit e5c388b4b9
1 changed files with 30 additions and 47 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

75
arch/arc/kernel/troubleshoot.c
View File

@ -18,44 +18,37 @@
#define ARC_PATH_MAX 256
/*
* Common routine to print scratch regs (r0-r12) or callee regs (r13-r25)
* -Prints 3 regs per line and a CR.
* -To continue, callee regs right after scratch, special handling of CR
*/
static noinline void print_reg_file(long *reg_rev, int start_num)
static noinline void print_regs_scratch(struct pt_regs *regs)
{
unsigned int i;
char buf[512];
int n = 0, len = sizeof(buf);
pr_cont("BTA: 0x%08lx\n SP: 0x%08lx FP: 0x%08lx BLK: %pS\n",
regs->bta, regs->sp, regs->fp, (void *)regs->blink);
pr_cont("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n",
regs->lp_start, regs->lp_end, regs->lp_count);
for (i = start_num; i < start_num + 13; i++) {
n += scnprintf(buf + n, len - n, "r%02u: 0x%08lx\t",
i, (unsigned long)*reg_rev);
if (((i + 1) % 3) == 0)
n += scnprintf(buf + n, len - n, "\n");
/* because pt_regs has regs reversed: r12..r0, r25..r13 */
if (is_isa_arcv2() && start_num == 0)
reg_rev++;
else
reg_rev--;
pr_info("r00: 0x%08lx\tr01: 0x%08lx\tr02: 0x%08lx\n" \
"r03: 0x%08lx\tr04: 0x%08lx\tr05: 0x%08lx\n" \
"r06: 0x%08lx\tr07: 0x%08lx\tr08: 0x%08lx\n" \
"r09: 0x%08lx\tr10: 0x%08lx\tr11: 0x%08lx\n" \
"r12: 0x%08lx\t",
regs->r0, regs->r1, regs->r2,
regs->r3, regs->r4, regs->r5,
regs->r6, regs->r7, regs->r8,
regs->r9, regs->r10, regs->r11,
regs->r12);
}
if (start_num != 0)
n += scnprintf(buf + n, len - n, "\n\n");
/* To continue printing callee regs on same line as scratch regs */
if (start_num == 0)
pr_info("%s", buf);
else
pr_cont("%s\n", buf);
}
static void show_callee_regs(struct callee_regs *cregs)
static void print_regs_callee(struct callee_regs *regs)
{
print_reg_file(&(cregs->r13), 13);
pr_cont("r13: 0x%08lx\tr14: 0x%08lx\n" \
"r15: 0x%08lx\tr16: 0x%08lx\tr17: 0x%08lx\n" \
"r18: 0x%08lx\tr19: 0x%08lx\tr20: 0x%08lx\n" \
"r21: 0x%08lx\tr22: 0x%08lx\tr23: 0x%08lx\n" \
"r24: 0x%08lx\tr25: 0x%08lx\n",
regs->r13, regs->r14,
regs->r15, regs->r16, regs->r17,
regs->r18, regs->r19, regs->r20,
regs->r21, regs->r22, regs->r23,
regs->r24, regs->r25);
}
static void print_task_path_n_nm(struct task_struct *tsk)
@ -175,7 +168,7 @@ static void show_ecr_verbose(struct pt_regs *regs)
void show_regs(struct pt_regs *regs)
{
struct task_struct *tsk = current;
struct callee_regs *cregs;
struct callee_regs *cregs = (struct callee_regs *)tsk->thread.callee_reg;
/*
* generic code calls us with preemption disabled, but some calls
@ -209,20 +202,10 @@ void show_regs(struct pt_regs *regs)
(regs->status32 & STATUS_U_MASK) ? "U " : "K ",
STS_BIT(regs, DE), STS_BIT(regs, AE));
#endif
pr_cont(" BTA: 0x%08lx\n SP: 0x%08lx FP: 0x%08lx BLK: %pS\n",
regs->bta, regs->sp, regs->fp, (void *)regs->blink);
pr_info("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n",
regs->lp_start, regs->lp_end, regs->lp_count);
/* print regs->r0 thru regs->r12
* Sequential printing was generating horrible code
*/
print_reg_file(&(regs->r0), 0);
/* If Callee regs were saved, display them too */
cregs = (struct callee_regs *)current->thread.callee_reg;
print_regs_scratch(regs);
if (cregs)
show_callee_regs(cregs);
print_regs_callee(cregs);
preempt_disable();
}