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|
/*--------------------------------------------------------------------------
--
-- Identity : Linux50 Debug Funcions
--
-- File : arch/sh64/lib/dbg.C
--
-- Copyright 2000, 2001 STMicroelectronics Limited.
-- Copyright 2004 Richard Curnow (evt_debug etc)
--
--------------------------------------------------------------------------*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <asm/mmu_context.h>
typedef u64 regType_t;
static regType_t getConfigReg(u64 id)
{
register u64 reg __asm__("r2");
asm volatile ("getcfg %1, 0, %0":"=r" (reg):"r"(id));
return (reg);
}
/* ======================================================================= */
static char *szTab[] = { "4k", "64k", "1M", "512M" };
static char *protTab[] = { "----",
"---R",
"--X-",
"--XR",
"-W--",
"-W-R",
"-WX-",
"-WXR",
"U---",
"U--R",
"U-X-",
"U-XR",
"UW--",
"UW-R",
"UWX-",
"UWXR"
};
#define ITLB_BASE 0x00000000
#define DTLB_BASE 0x00800000
#define MAX_TLBs 64
/* PTE High */
#define GET_VALID(pte) ((pte) & 0x1)
#define GET_SHARED(pte) ((pte) & 0x2)
#define GET_ASID(pte) ((pte >> 2) & 0x0ff)
#define GET_EPN(pte) ((pte) & 0xfffff000)
/* PTE Low */
#define GET_CBEHAVIOR(pte) ((pte) & 0x3)
#define GET_PAGE_SIZE(pte) szTab[((pte >> 3) & 0x3)]
#define GET_PROTECTION(pte) protTab[((pte >> 6) & 0xf)]
#define GET_PPN(pte) ((pte) & 0xfffff000)
#define PAGE_1K_MASK 0x00000000
#define PAGE_4K_MASK 0x00000010
#define PAGE_64K_MASK 0x00000080
#define MMU_PAGESIZE_MASK (PAGE_64K_MASK | PAGE_4K_MASK)
#define PAGE_1MB_MASK MMU_PAGESIZE_MASK
#define PAGE_1K (1024)
#define PAGE_4K (1024 * 4)
#define PAGE_64K (1024 * 64)
#define PAGE_1MB (1024 * 1024)
#define HOW_TO_READ_TLB_CONTENT \
"[ ID] PPN EPN ASID Share CB P.Size PROT.\n"
void print_single_tlb(unsigned long tlb, int single_print)
{
regType_t pteH;
regType_t pteL;
unsigned int valid, shared, asid, epn, cb, ppn;
char *pSize;
char *pProt;
/*
** in case of single print <single_print> is true, this implies:
** 1) print the TLB in any case also if NOT VALID
** 2) print out the header
*/
pteH = getConfigReg(tlb);
valid = GET_VALID(pteH);
if (single_print)
printk(HOW_TO_READ_TLB_CONTENT);
else if (!valid)
return;
pteL = getConfigReg(tlb + 1);
shared = GET_SHARED(pteH);
asid = GET_ASID(pteH);
epn = GET_EPN(pteH);
cb = GET_CBEHAVIOR(pteL);
pSize = GET_PAGE_SIZE(pteL);
pProt = GET_PROTECTION(pteL);
ppn = GET_PPN(pteL);
printk("[%c%2ld] 0x%08x 0x%08x %03d %02x %02x %4s %s\n",
((valid) ? ' ' : 'u'), ((tlb & 0x0ffff) / TLB_STEP),
ppn, epn, asid, shared, cb, pSize, pProt);
}
void print_dtlb(void)
{
int count;
unsigned long tlb;
printk(" ================= SH-5 D-TLBs Status ===================\n");
printk(HOW_TO_READ_TLB_CONTENT);
tlb = DTLB_BASE;
for (count = 0; count < MAX_TLBs; count++, tlb += TLB_STEP)
print_single_tlb(tlb, 0);
printk
(" =============================================================\n");
}
void print_itlb(void)
{
int count;
unsigned long tlb;
printk(" ================= SH-5 I-TLBs Status ===================\n");
printk(HOW_TO_READ_TLB_CONTENT);
tlb = ITLB_BASE;
for (count = 0; count < MAX_TLBs; count++, tlb += TLB_STEP)
print_single_tlb(tlb, 0);
printk
(" =============================================================\n");
}
/* ======================================================================= */
#ifdef CONFIG_POOR_MANS_STRACE
#include "syscalltab.h"
struct ring_node {
int evt;
int ret_addr;
int event;
int tra;
int pid;
unsigned long sp;
unsigned long pc;
};
static struct ring_node event_ring[16];
static int event_ptr = 0;
struct stored_syscall_data {
int pid;
int syscall_number;
};
#define N_STORED_SYSCALLS 16
static struct stored_syscall_data stored_syscalls[N_STORED_SYSCALLS];
static int syscall_next=0;
static int syscall_next_print=0;
void evt_debug(int evt, int ret_addr, int event, int tra, struct pt_regs *regs)
{
int syscallno = tra & 0xff;
unsigned long sp;
unsigned long stack_bottom;
int pid;
struct ring_node *rr;
pid = current->pid;
stack_bottom = (unsigned long) task_stack_page(current);
asm volatile("ori r15, 0, %0" : "=r" (sp));
rr = event_ring + event_ptr;
rr->evt = evt;
rr->ret_addr = ret_addr;
rr->event = event;
rr->tra = tra;
rr->pid = pid;
rr->sp = sp;
rr->pc = regs->pc;
if (sp < stack_bottom + 3092) {
printk("evt_debug : stack underflow report\n");
int i, j;
for (j=0, i = event_ptr; j<16; j++) {
rr = event_ring + i;
printk("evt=%08x event=%08x tra=%08x pid=%5d sp=%08lx pc=%08lx\n",
rr->evt, rr->event, rr->tra, rr->pid, rr->sp, rr->pc);
i--;
i &= 15;
}
panic("STACK UNDERFLOW\n");
}
event_ptr = (event_ptr + 1) & 15;
if ((event == 2) && (evt == 0x160)) {
if (syscallno < NUM_SYSCALL_INFO_ENTRIES) {
/* Store the syscall information to print later. We
* can't print this now - currently we're running with
* SR.BL=1, so we can't take a tlbmiss (which could occur
* in the console drivers under printk).
*
* Just overwrite old entries on ring overflow - this
* is only for last-hope debugging. */
stored_syscalls[syscall_next].pid = current->pid;
stored_syscalls[syscall_next].syscall_number = syscallno;
syscall_next++;
syscall_next &= (N_STORED_SYSCALLS - 1);
}
}
}
static void drain_syscalls(void) {
while (syscall_next_print != syscall_next) {
printk("Task %d: %s()\n",
stored_syscalls[syscall_next_print].pid,
syscall_info_table[stored_syscalls[syscall_next_print].syscall_number].name);
syscall_next_print++;
syscall_next_print &= (N_STORED_SYSCALLS - 1);
}
}
void evt_debug2(unsigned int ret)
{
drain_syscalls();
printk("Task %d: syscall returns %08x\n", current->pid, ret);
}
void evt_debug_ret_from_irq(struct pt_regs *regs)
{
int pid;
struct ring_node *rr;
pid = current->pid;
rr = event_ring + event_ptr;
rr->evt = 0xffff;
rr->ret_addr = 0;
rr->event = 0;
rr->tra = 0;
rr->pid = pid;
rr->pc = regs->pc;
event_ptr = (event_ptr + 1) & 15;
}
void evt_debug_ret_from_exc(struct pt_regs *regs)
{
int pid;
struct ring_node *rr;
pid = current->pid;
rr = event_ring + event_ptr;
rr->evt = 0xfffe;
rr->ret_addr = 0;
rr->event = 0;
rr->tra = 0;
rr->pid = pid;
rr->pc = regs->pc;
event_ptr = (event_ptr + 1) & 15;
}
#endif /* CONFIG_POOR_MANS_STRACE */
/* ======================================================================= */
void show_excp_regs(char *from, int trapnr, int signr, struct pt_regs *regs)
{
unsigned long long ah, al, bh, bl, ch,
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