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Diffstat (limited to 'arch/mn10300/kernel/gdb-stub.c')
-rw-r--r--arch/mn10300/kernel/gdb-stub.c194
1 files changed, 85 insertions, 109 deletions
diff --git a/arch/mn10300/kernel/gdb-stub.c b/arch/mn10300/kernel/gdb-stub.c
index 21891c71d54..a128c57b586 100644
--- a/arch/mn10300/kernel/gdb-stub.c
+++ b/arch/mn10300/kernel/gdb-stub.c
@@ -130,14 +130,13 @@
#include <linux/bug.h>
#include <asm/pgtable.h>
-#include <asm/system.h>
#include <asm/gdb-stub.h>
#include <asm/exceptions.h>
-#include <asm/cacheflush.h>
+#include <asm/debugger.h>
#include <asm/serial-regs.h>
#include <asm/busctl-regs.h>
-#include <asm/unit/leds.h>
-#include <asm/unit/serial.h>
+#include <unit/leds.h>
+#include <unit/serial.h>
/* define to use F7F7 rather than FF which is subverted by JTAG debugger */
#undef GDBSTUB_USE_F7F7_AS_BREAKPOINT
@@ -163,8 +162,6 @@ static char input_buffer[BUFMAX];
static char output_buffer[BUFMAX];
static char trans_buffer[BUFMAX];
-static const char hexchars[] = "0123456789abcdef";
-
struct gdbstub_bkpt {
u8 *addr; /* address of breakpoint */
u8 len; /* size of breakpoint */
@@ -363,8 +360,8 @@ static int putpacket(char *buffer)
}
gdbstub_io_tx_char('#');
- gdbstub_io_tx_char(hexchars[checksum >> 4]);
- gdbstub_io_tx_char(hexchars[checksum & 0xf]);
+ gdbstub_io_tx_char(hex_asc_hi(checksum));
+ gdbstub_io_tx_char(hex_asc_lo(checksum));
} while (gdbstub_io_rx_char(&ch, 0),
ch == '-' && (gdbstub_io("### GDB Rx NAK\n"), 0),
@@ -407,6 +404,7 @@ static int hexToInt(char **ptr, int *intValue)
return (numChars);
}
+#ifdef CONFIG_GDBSTUB_ALLOW_SINGLE_STEP
/*
* We single-step by setting breakpoints. When an exception
* is handled, we need to restore the instructions hoisted
@@ -442,15 +440,11 @@ static const unsigned char gdbstub_insn_sizes[256] =
static int __gdbstub_mark_bp(u8 *addr, int ix)
{
- if (addr < (u8 *) 0x70000000UL)
- return 0;
- /* 70000000-7fffffff: vmalloc area */
- if (addr < (u8 *) 0x80000000UL)
+ /* vmalloc area */
+ if (((u8 *) VMALLOC_START <= addr) && (addr < (u8 *) VMALLOC_END))
goto okay;
- if (addr < (u8 *) 0x8c000000UL)
- return 0;
- /* 8c000000-93ffffff: SRAM, SDRAM */
- if (addr < (u8 *) 0x94000000UL)
+ /* SRAM, SDRAM */
+ if (((u8 *) 0x80000000UL <= addr) && (addr < (u8 *) 0xa0000000UL))
goto okay;
return 0;
@@ -524,17 +518,7 @@ static int gdbstub_single_step(struct pt_regs *regs)
} else {
switch (cur) {
/* Bxx (d8,PC) */
- case 0xc0:
- case 0xc1:
- case 0xc2:
- case 0xc3:
- case 0xc4:
- case 0xc5:
- case 0xc6:
- case 0xc7:
- case 0xc8:
- case 0xc9:
- case 0xca:
+ case 0xc0 ... 0xca:
if (gdbstub_read_byte(pc + 1, (u8 *) &x) < 0)
goto fault;
if (!__gdbstub_mark_bp(pc + 2, 0))
@@ -545,17 +529,7 @@ static int gdbstub_single_step(struct pt_regs *regs)
break;
/* LXX (d8,PC) */
- case 0xd0:
- case 0xd1:
- case 0xd2:
- case 0xd3:
- case 0xd4:
- case 0xd5:
- case 0xd6:
- case 0xd7:
- case 0xd8:
- case 0xd9:
- case 0xda:
+ case 0xd0 ... 0xda:
if (!__gdbstub_mark_bp(pc + 1, 0))
goto fault;
if (regs->pc != regs->lar &&
@@ -755,6 +729,7 @@ static int gdbstub_single_step(struct pt_regs *regs)
__gdbstub_restore_bp();
return -EFAULT;
}
+#endif /* CONFIG_GDBSTUB_ALLOW_SINGLE_STEP */
#ifdef CONFIG_GDBSTUB_CONSOLE
@@ -822,8 +797,7 @@ unsigned char *mem2hex(const void *_mem, char *buf, int count, int may_fault)
if ((u32) mem & 1 && count >= 1) {
if (gdbstub_read_byte(mem, ch) != 0)
return 0;
- *buf++ = hexchars[ch[0] >> 4];
- *buf++ = hexchars[ch[0] & 0xf];
+ buf = hex_byte_pack(buf, ch[0]);
mem++;
count--;
}
@@ -831,10 +805,8 @@ unsigned char *mem2hex(const void *_mem, char *buf, int count, int may_fault)
if ((u32) mem & 3 && count >= 2) {
if (gdbstub_read_word(mem, ch) != 0)
return 0;
- *buf++ = hexchars[ch[0] >> 4];
- *buf++ = hexchars[ch[0] & 0xf];
- *buf++ = hexchars[ch[1] >> 4];
- *buf++ = hexchars[ch[1] & 0xf];
+ buf = hex_byte_pack(buf, ch[0]);
+ buf = hex_byte_pack(buf, ch[1]);
mem += 2;
count -= 2;
}
@@ -842,14 +814,10 @@ unsigned char *mem2hex(const void *_mem, char *buf, int count, int may_fault)
while (count >= 4) {
if (gdbstub_read_dword(mem, ch) != 0)
return 0;
- *buf++ = hexchars[ch[0] >> 4];
- *buf++ = hexchars[ch[0] & 0xf];
- *buf++ = hexchars[ch[1] >> 4];
- *buf++ = hexchars[ch[1] & 0xf];
- *buf++ = hexchars[ch[2] >> 4];
- *buf++ = hexchars[ch[2] & 0xf];
- *buf++ = hexchars[ch[3] >> 4];
- *buf++ = hexchars[ch[3] & 0xf];
+ buf = hex_byte_pack(buf, ch[0]);
+ buf = hex_byte_pack(buf, ch[1]);
+ buf = hex_byte_pack(buf, ch[2]);
+ buf = hex_byte_pack(buf, ch[3]);
mem += 4;
count -= 4;
}
@@ -857,10 +825,8 @@ unsigned char *mem2hex(const void *_mem, char *buf, int count, int may_fault)
if (count >= 2) {
if (gdbstub_read_word(mem, ch) != 0)
return 0;
- *buf++ = hexchars[ch[0] >> 4];
- *buf++ = hexchars[ch[0] & 0xf];
- *buf++ = hexchars[ch[1] >> 4];
- *buf++ = hexchars[ch[1] & 0xf];
+ buf = hex_byte_pack(buf, ch[0]);
+ buf = hex_byte_pack(buf, ch[1]);
mem += 2;
count -= 2;
}
@@ -868,8 +834,7 @@ unsigned char *mem2hex(const void *_mem, char *buf, int count, int may_fault)
if (count >= 1) {
if (gdbstub_read_byte(mem, ch) != 0)
return 0;
- *buf++ = hexchars[ch[0] >> 4];
- *buf++ = hexchars[ch[0] & 0xf];
+ buf = hex_byte_pack(buf, ch[0]);
}
*buf = 0;
@@ -1207,7 +1172,7 @@ int gdbstub_clear_breakpoint(u8 *addr, int len)
/*
* This function does all command processing for interfacing to gdb
- * - returns 1 if the exception should be skipped, 0 otherwise.
+ * - returns 0 if the exception should be skipped, -ERROR otherwise.
*/
static int gdbstub(struct pt_regs *regs, enum exception_code excep)
{
@@ -1222,16 +1187,16 @@ static int gdbstub(struct pt_regs *regs, enum exception_code excep)
int loop;
if (excep == EXCEP_FPU_DISABLED)
- return 0;
+ return -ENOTSUPP;
gdbstub_flush_caches = 0;
mn10300_set_gdbleds(1);
asm volatile("mov mdr,%0" : "=d"(mdr));
- asm volatile("mov epsw,%0" : "=d"(epsw));
- asm volatile("mov %0,epsw"
- :: "d"((epsw & ~EPSW_IM) | EPSW_IE | EPSW_IM_1));
+ local_save_flags(epsw);
+ arch_local_change_intr_mask_level(
+ NUM2EPSW_IM(CONFIG_DEBUGGER_IRQ_LEVEL + 1));
gdbstub_store_fpu();
@@ -1244,11 +1209,13 @@ static int gdbstub(struct pt_regs *regs, enum exception_code excep)
/* if we were single stepping, restore the opcodes hoisted for the
* breakpoint[s] */
broke = 0;
+#ifdef CONFIG_GDBSTUB_ALLOW_SINGLE_STEP
if ((step_bp[0].addr && step_bp[0].addr == (u8 *) regs->pc) ||
(step_bp[1].addr && step_bp[1].addr == (u8 *) regs->pc))
broke = 1;
__gdbstub_restore_bp();
+#endif
if (gdbstub_rx_unget) {
sigval = SIGINT;
@@ -1304,14 +1271,14 @@ static int gdbstub(struct pt_regs *regs, enum exception_code excep)
*ptr++ = 'O';
ptr = mem2hex(title, ptr, sizeof(title) - 1, 0);
- hx = hexchars[(excep & 0xf000) >> 12];
- *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf];
- hx = hexchars[(excep & 0x0f00) >> 8];
- *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf];
- hx = hexchars[(excep & 0x00f0) >> 4];
- *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf];
- hx = hexchars[(excep & 0x000f)];
- *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf];
+ hx = hex_asc_hi(excep >> 8);
+ ptr = hex_byte_pack(ptr, hx);
+ hx = hex_asc_lo(excep >> 8);
+ ptr = hex_byte_pack(ptr, hx);
+ hx = hex_asc_hi(excep);
+ ptr = hex_byte_pack(ptr, hx);
+ hx = hex_asc_lo(excep);
+ ptr = hex_byte_pack(ptr, hx);
ptr = mem2hex(crlf, ptr, sizeof(crlf) - 1, 0);
*ptr = 0;
@@ -1322,22 +1289,22 @@ static int gdbstub(struct pt_regs *regs, enum exception_code excep)
*ptr++ = 'O';
ptr = mem2hex(tbcberr, ptr, sizeof(tbcberr) - 1, 0);
- hx = hexchars[(bcberr & 0xf0000000) >> 28];
- *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf];
- hx = hexchars[(bcberr & 0x0f000000) >> 24];
- *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf];
- hx = hexchars[(bcberr & 0x00f00000) >> 20];
- *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf];
- hx = hexchars[(bcberr & 0x000f0000) >> 16];
- *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf];
- hx = hexchars[(bcberr & 0x0000f000) >> 12];
- *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf];
- hx = hexchars[(bcberr & 0x00000f00) >> 8];
- *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf];
- hx = hexchars[(bcberr & 0x000000f0) >> 4];
- *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf];
- hx = hexchars[(bcberr & 0x0000000f)];
- *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf];
+ hx = hex_asc_hi(bcberr >> 24);
+ ptr = hex_byte_pack(ptr, hx);
+ hx = hex_asc_lo(bcberr >> 24);
+ ptr = hex_byte_pack(ptr, hx);
+ hx = hex_asc_hi(bcberr >> 16);
+ ptr = hex_byte_pack(ptr, hx);
+ hx = hex_asc_lo(bcberr >> 16);
+ ptr = hex_byte_pack(ptr, hx);
+ hx = hex_asc_hi(bcberr >> 8);
+ ptr = hex_byte_pack(ptr, hx);
+ hx = hex_asc_lo(bcberr >> 8);
+ ptr = hex_byte_pack(ptr, hx);
+ hx = hex_asc_hi(bcberr);
+ ptr = hex_byte_pack(ptr, hx);
+ hx = hex_asc_lo(bcberr);
+ ptr = hex_byte_pack(ptr, hx);
ptr = mem2hex(crlf, ptr, sizeof(crlf) - 1, 0);
*ptr = 0;
@@ -1353,14 +1320,12 @@ static int gdbstub(struct pt_regs *regs, enum exception_code excep)
* Send trap type (converted to signal)
*/
*ptr++ = 'T';
- *ptr++ = hexchars[sigval >> 4];
- *ptr++ = hexchars[sigval & 0xf];
+ ptr = hex_byte_pack(ptr, sigval);
/*
* Send Error PC
*/
- *ptr++ = hexchars[GDB_REGID_PC >> 4];
- *ptr++ = hexchars[GDB_REGID_PC & 0xf];
+ ptr = hex_byte_pack(ptr, GDB_REGID_PC);
*ptr++ = ':';
ptr = mem2hex(&regs->pc, ptr, 4, 0);
*ptr++ = ';';
@@ -1368,8 +1333,7 @@ static int gdbstub(struct pt_regs *regs, enum exception_code excep)
/*
* Send frame pointer
*/
- *ptr++ = hexchars[GDB_REGID_FP >> 4];
- *ptr++ = hexchars[GDB_REGID_FP & 0xf];
+ ptr = hex_byte_pack(ptr, GDB_REGID_FP);
*ptr++ = ':';
ptr = mem2hex(&regs->a3, ptr, 4, 0);
*ptr++ = ';';
@@ -1378,8 +1342,7 @@ static int gdbstub(struct pt_regs *regs, enum exception_code excep)
* Send stack pointer
*/
ssp = (unsigned long) (regs + 1);
- *ptr++ = hexchars[GDB_REGID_SP >> 4];
- *ptr++ = hexchars[GDB_REGID_SP & 0xf];
+ ptr = hex_byte_pack(ptr, GDB_REGID_SP);
*ptr++ = ':';
ptr = mem2hex(&ssp, ptr, 4, 0);
*ptr++ = ';';
@@ -1399,8 +1362,8 @@ packet_waiting:
/* request repeat of last signal number */
case '?':
output_buffer[0] = 'S';
- output_buffer[1] = hexchars[sigval >> 4];
- output_buffer[2] = hexchars[sigval & 0xf];
+ output_buffer[1] = hex_asc_hi(sigval);
+ output_buffer[2] = hex_asc_lo(sigval);
output_buffer[3] = 0;
break;
@@ -1588,17 +1551,21 @@ packet_waiting:
* Step to next instruction
*/
case 's':
- /*
- * using the T flag doesn't seem to perform single
+ /* Using the T flag doesn't seem to perform single
* stepping (it seems to wind up being caught by the
* JTAG unit), so we have to use breakpoints and
* continue instead.
*/
+#ifdef CONFIG_GDBSTUB_ALLOW_SINGLE_STEP
if (gdbstub_single_step(regs) < 0)
/* ignore any fault error for now */
gdbstub_printk("unable to set single-step"
" bp\n");
goto done;
+#else
+ gdbstub_strcpy(output_buffer, "E01");
+ break;
+#endif
/*
* Set baud rate (bBB)
@@ -1697,7 +1664,7 @@ done:
* NB: We flush both caches, just to be sure...
*/
if (gdbstub_flush_caches)
- gdbstub_purge_cache();
+ debugger_local_cache_flushinv();
gdbstub_load_fpu();
mn10300_set_gdbleds(0);
@@ -1707,14 +1674,23 @@ done:
touch_softlockup_watchdog();
local_irq_restore(epsw);
- return 1;
+ return 0;
+}
+
+/*
+ * Determine if we hit a debugger special breakpoint that needs skipping over
+ * automatically.
+ */
+int at_debugger_breakpoint(struct pt_regs *regs)
+{
+ return 0;
}
/*
* handle event interception
*/
-asmlinkage int gdbstub_intercept(struct pt_regs *regs,
- enum exception_code excep)
+asmlinkage int debugger_intercept(enum exception_code excep,
+ int signo, int si_code, struct pt_regs *regs)
{
static u8 notfirst = 1;
int ret;
@@ -1728,7 +1704,7 @@ asmlinkage int gdbstub_intercept(struct pt_regs *regs,
asm("mov mdr,%0" : "=d"(mdr));
gdbstub_entry(
- "--> gdbstub_intercept(%p,%04x) [MDR=%lx PC=%lx]\n",
+ "--> debugger_intercept(%p,%04x) [MDR=%lx PC=%lx]\n",
regs, excep, mdr, regs->pc);
gdbstub_entry(
@@ -1762,7 +1738,7 @@ asmlinkage int gdbstub_intercept(struct pt_regs *regs,
ret = gdbstub(regs, excep);
- gdbstub_entry("<-- gdbstub_intercept()\n");
+ gdbstub_entry("<-- debugger_intercept()\n");
gdbstub_busy = 0;
return ret;
}
@@ -1838,8 +1814,8 @@ void gdbstub_exit(int status)
gdbstub_busy = 1;
output_buffer[0] = 'W';
- output_buffer[1] = hexchars[(status >> 4) & 0x0F];
- output_buffer[2] = hexchars[status & 0x0F];
+ output_buffer[1] = hex_asc_hi(status);
+ output_buffer[2] = hex_asc_lo(status);
output_buffer[3] = 0;
gdbstub_io_tx_char('$');
@@ -1853,8 +1829,8 @@ void gdbstub_exit(int status)
}
gdbstub_io_tx_char('#');
- gdbstub_io_tx_char(hexchars[checksum >> 4]);
- gdbstub_io_tx_char(hexchars[checksum & 0xf]);
+ gdbstub_io_tx_char(hex_asc_hi(checksum));
+ gdbstub_io_tx_char(hex_asc_lo(checksum));
/* make sure the output is flushed, or else RedBoot might clobber it */
gdbstub_io_tx_flush();
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-06 10:07:49 +0000