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* linux-ppc-low.c (INSTR_SC, NR_spu_run): Define.

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(parse_spufs_run): New function.
	(ppc_get_pc, ppc_set_pc): Detect and handle SPU PC.
	(ppc_breakpoint_at): Handle SPU breakpoints.
This commit is contained in:
Ulrich Weigand
2009-07-31 15:30:03 +00:00
parent 85e747d249
commit 0b9ff2c0a4
2 changed files with 97 additions and 7 deletions
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97
gdb/gdbserver/linux-ppc-low.c
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@@ -191,10 +191,72 @@ ppc_supply_ptrace_register (int regno, const char *buf)
supply_register (regno, buf);
}
#define INSTR_SC 0x44000002
#define NR_spu_run 0x0116
/* If the PPU thread is currently stopped on a spu_run system call,
return to FD and ADDR the file handle and NPC parameter address
used with the system call. Return non-zero if successful. */
static int
parse_spufs_run (int *fd, CORE_ADDR *addr)
{
CORE_ADDR curr_pc;
int curr_insn;
int curr_r0;
if (register_size (0) == 4)
{
unsigned int pc, r0, r3, r4;
collect_register_by_name ("pc", &pc);
collect_register_by_name ("r0", &r0);
collect_register_by_name ("orig_r3", &r3);
collect_register_by_name ("r4", &r4);
curr_pc = (CORE_ADDR) pc;
curr_r0 = (int) r0;
*fd = (int) r3;
*addr = (CORE_ADDR) r4;
}
else
{
unsigned long pc, r0, r3, r4;
collect_register_by_name ("pc", &pc);
collect_register_by_name ("r0", &r0);
collect_register_by_name ("orig_r3", &r3);
collect_register_by_name ("r4", &r4);
curr_pc = (CORE_ADDR) pc;
curr_r0 = (int) r0;
*fd = (int) r3;
*addr = (CORE_ADDR) r4;
}
/* Fetch instruction preceding current NIP. */
if ((*the_target->read_memory) (curr_pc - 4,
(unsigned char *) &curr_insn, 4) != 0)
return 0;
/* It should be a "sc" instruction. */
if (curr_insn != INSTR_SC)
return 0;
/* System call number should be NR_spu_run. */
if (curr_r0 != NR_spu_run)
return 0;
return 1;
}
static CORE_ADDR
ppc_get_pc (void)
{
if (register_size (0) == 4)
CORE_ADDR addr;
int fd;
if (parse_spufs_run (&fd, &addr))
{
unsigned int pc;
(*the_target->read_memory) (addr, (unsigned char *) &pc, 4);
return ((CORE_ADDR)1 << 63) | ((CORE_ADDR)fd << 32) | (CORE_ADDR) (pc - 4);
}
else if (register_size (0) == 4)
{
unsigned int pc;
collect_register_by_name ("pc", &pc);
@@ -211,7 +273,15 @@ ppc_get_pc (void)
static void
ppc_set_pc (CORE_ADDR pc)
{
if (register_size (0) == 4)
CORE_ADDR addr;
int fd;
if (parse_spufs_run (&fd, &addr))
{
unsigned int newpc = pc;
(*the_target->write_memory) (addr, (unsigned char *) &newpc, 4);
}
else if (register_size (0) == 4)
{
unsigned int newpc = pc;
supply_register_by_name ("pc", &newpc);
@@ -355,11 +425,24 @@ ppc_breakpoint_at (CORE_ADDR where)
{
unsigned int insn;
(*the_target->read_memory) (where, (unsigned char *) &insn, 4);
if (insn == ppc_breakpoint)
return 1;
/* If necessary, recognize more trap instructions here. GDB only uses the
one. */
if (where & ((CORE_ADDR)1 << 63))
{
char mem_annex[32];
sprintf (mem_annex, "%d/mem", (int)((where >> 32) & 0x7fffffff));
(*the_target->qxfer_spu) (mem_annex, (unsigned char *) &insn,
NULL, where & 0xffffffff, 4);
if (insn == 0x3fff)
return 1;
}
else
{
(*the_target->read_memory) (where, (unsigned char *) &insn, 4);
if (insn == ppc_breakpoint)
return 1;
/* If necessary, recognize more trap instructions here. GDB only uses
the one. */
}
return 0;
}