diff options
Diffstat (limited to 'gdb/ppc-linux-nat.c')
| -rw-r--r-- | gdb/ppc-linux-nat.c | 37 |
1 files changed, 34 insertions, 3 deletions
diff --git a/gdb/ppc-linux-nat.c b/gdb/ppc-linux-nat.c index 8227aa8..372ad0c 100644 --- a/gdb/ppc-linux-nat.c +++ b/gdb/ppc-linux-nat.c @@ -127,7 +127,9 @@ ppc_register_u_addr (int regno) { int u_addr = -1; struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); - int wordsize = tdep->wordsize; + /* NOTE: cagney/2003-11-25: This is the word size used by the ptrace + interface, and not the wordsize of the program's ABI. */ + int wordsize = sizeof (PTRACE_XFER_TYPE); /* General purpose registers occupy 1 slot each in the buffer */ if (regno >= tdep->ppc_gp0_regnum && regno <= tdep->ppc_gplast_regnum ) @@ -235,6 +237,9 @@ fetch_register (int tid, int regno) return; } + /* Read the raw register using PTRACE_XFER_TYPE sized chunks. On a + 32-bit platform, 64-bit floating-point registers will require two + transfers. */ for (i = 0; i < DEPRECATED_REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) { errno = 0; @@ -248,7 +253,19 @@ fetch_register (int tid, int regno) perror_with_name (mess); } } - supply_register (regno, buf); + + /* Now supply the register. Be careful to map between ptrace's and + the current_regcache's idea of the current wordsize. */ + if ((regno >= FP0_REGNUM && regno < FP0_REGNUM +32) + || gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_LITTLE) + /* FPs are always 64 bits. Little endian values are always found + at the left-hand end of the register. */ + regcache_raw_supply (current_regcache, regno, buf); + else + /* Big endian register, need to fetch the right-hand end. */ + regcache_raw_supply (current_regcache, regno, + (buf + sizeof (PTRACE_XFER_TYPE) + - register_size (current_gdbarch, regno))); } static void @@ -380,7 +397,21 @@ store_register (int tid, int regno) if (regaddr == -1) return; - regcache_collect (regno, buf); + /* First collect the register value from the regcache. Be careful + to to convert the regcache's wordsize into ptrace's wordsize. */ + memset (buf, 0, sizeof buf); + if ((regno >= FP0_REGNUM && regno < FP0_REGNUM + 32) + || TARGET_BYTE_ORDER == BFD_ENDIAN_LITTLE) + /* Floats are always 64-bit. Little endian registers are always + at the left-hand end of the register cache. */ + regcache_raw_collect (current_regcache, regno, buf); + else + /* Big-endian registers belong at the right-hand end of the + buffer. */ + regcache_raw_collect (current_regcache, regno, + (buf + sizeof (PTRACE_XFER_TYPE) + - register_size (current_gdbarch, regno))); + for (i = 0; i < DEPRECATED_REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) { errno = 0; |