diff options
Diffstat (limited to 'tapset')
| -rw-r--r-- | tapset/ChangeLog | 4 | ||||
| -rw-r--r-- | tapset/s390x/registers.stp | 213 |
2 files changed, 217 insertions, 0 deletions
diff --git a/tapset/ChangeLog b/tapset/ChangeLog index d50e3fd5..377a7785 100644 --- a/tapset/ChangeLog +++ b/tapset/ChangeLog @@ -1,3 +1,7 @@ +2008-11-19 Ananth Mavinakayanahalli <ananth@us.ibm.com> and Jim Keniston <jkenisto@us.ibm.com> + + * s390x/registers.stp: Added + 2008-11-13 William Cohen <wcohen@redhat.com> * networking.stp: Order entries in table. diff --git a/tapset/s390x/registers.stp b/tapset/s390x/registers.stp new file mode 100644 index 00000000..48c5d59b --- /dev/null +++ b/tapset/s390x/registers.stp @@ -0,0 +1,213 @@ +/* Dwarfless register access for s390x */ + +global _reg_offsets, _stp_regs_registered + +function _stp_register_regs() { + /* Same order as pt_regs */ + _reg_offsets["args"] = 0 + _reg_offsets["psw.mask"] = 8 + _reg_offsets["psw.addr"] = 16 + _reg_offsets["r0"] = 24 + _reg_offsets["r1"] = 32 + _reg_offsets["r2"] = 40 + _reg_offsets["r3"] = 48 + _reg_offsets["r4"] = 56 + _reg_offsets["r5"] = 64 + _reg_offsets["r6"] = 72 + _reg_offsets["r7"] = 80 + _reg_offsets["r8"] = 88 + _reg_offsets["r9"] = 96 + _reg_offsets["r10"] = 104 + _reg_offsets["r11"] = 112 + _reg_offsets["r12"] = 120 + _reg_offsets["r13"] = 128 + _reg_offsets["r14"] = 136 + _reg_offsets["r15"] = 144 + + _reg_offsets["orig_gpr2"] = 152 + _reg_offsets["ilc"] = 160 + _reg_offsets["trap"] = 162 + + /* + * If we ever need to support s390 (31-bit arch), we can + * get to the register offsets by using just a + * reg32_offset = _reg_offsets["reg"]/2 + * or somesuch + */ + _stp_regs_registered = 1 +} + + +/* + * Though the flag says 31bit, asm-s390/thread_info.h comment + * says "32bit process" + */ +function probing_32bit_app() %{ /* pure */ + if (CONTEXT->regs) + THIS->__retvalue = (user_mode(CONTEXT->regs) && + test_tsk_thread_flag(current, TIF_31BIT)); + else + THIS->__retvalue = 0; +%} + +function _stp_probing_kernel: long () %{ /* pure */ + THIS->__retvalue = !user_mode(CONTEXT->regs); +%} + +function _stp_get_register_by_offset:long (offset:long) %{ /* pure */ + long value; + + if (offset <= 152) + memcpy(&value, ((char *)CONTEXT->regs) + THIS->offset, + sizeof(value)); + else { + /* ilc or trap */ + unsigned short us_value; + memcpy(&us_value, ((char *)CONTEXT->regs) + THIS->offset, + sizeof(us_value)); + value = us_value; // not sign-extended + } + THIS->__retvalue = value; +%} + +function _stp_sign_extend32:long (value:long) { + if (value & 0x80000000) + value |= (0xffffffff << 32) + return value +} + +function _stp_register:long (name:string, sign_extend:long) { + if (!registers_valid()) { + error("cannot access CPU registers in this context") + return 0 + } + if (!_stp_regs_registered) + _stp_register_regs() + offset = _reg_offsets[name] + if (offset == 0 && !(name in _reg_offsets)) { + error("Unknown register: " . name) + return 0 + } + value = _stp_get_register_by_offset(offset) + if (probing_32bit_app()) { + if (sign_extend) + value = _stp_sign_extend32(value) + else + value &= 0xffffffff + } + return value +} + +/* Return the named register value as a signed value. */ +function register:long (name:string) { + return _stp_register(name, 1) +} + +/* + * Return the named register value as an unsigned value. Specifically, + * don't sign-extend the register value when promoting it to 64 bits. + */ +function u_register:long (name:string) { + return _stp_register(name, 0) +} + +/* + * Return the value of function arg #argnum (1=first arg). + * If truncate=1, mask off the top 32 bits. + * If sign_extend=1 and (truncate=1 or the probepoint we've hit is in a + * 32-bit app), sign-extend the 32-bit value. + * + * We don't yet support extracting arg #6 and beyond, which are passed + * on stack + */ +function _stp_arg:long (argnum:long, sign_extend:long, truncate:long) { + val = 0 + if (argnum < 1 || argnum > 5) { + error(sprintf("Cannot access arg(%d)", argnum)) + return 0 + } + + if (argnum == 1) + val = u_register("r2") + else if (argnum == 2) + val = u_register("r3") + else if (argnum == 3) + val = u_register("r4") + else if (argnum == 4) + val = u_register("r5") + else (argnum == 5) + val = u_register("r6") + + if (truncate) { + if (sign_extend) + val = _stp_sign_extend32(val) + else + /* High bits may be garbage. */ + val = (val & 0xffffffff); + } + return val; +} + +/* Return the value of function arg #argnum (1=first arg) as a signed int. */ +function int_arg:long (argnum:long) { + return _stp_arg(argnum, 1, 1) +} + +/* Return the value of function arg #argnum (1=first arg) as an unsigned int. */ +function uint_arg:long (argnum:long) { + return _stp_arg(argnum, 0, 1) +} + +function long_arg:long (argnum:long) { + return _stp_arg(argnum, 1, 0) +} + +function ulong_arg:long (argnum:long) { + return _stp_arg(argnum, 0, 0) +} + +function longlong_arg:long (argnum:long) { + if (probing_32bit_app()) { + /* TODO verify if this is correct for 31bit apps */ + highbits = _stp_arg(argnum, 0, 1) + lowbits = _stp_arg(argnum+1, 0, 1) + return ((highbits << 32) | lowbits) + } else + return _stp_arg(argnum, 0, 0) +} + +function ulonglong_arg:long (argnum:long) { + return longlong_arg(argnum) +} + +function pointer_arg:long (argnum:long) { + return _stp_arg(argnum, 0, 0) +} + +function s32_arg:long (argnum:long) { + return int_arg(argnum) +} + +function u32_arg:long (argnum:long) { + return uint_arg(argnum) +} + +function s64_arg:long (argnum:long) { + return longlong_arg(argnum) +} + +function u64_arg:long (argnum:long) { + return ulonglong_arg(argnum) +} + +function asmlinkage() { +} + +function fastcall() { +} + +function regparm() %{ + snprintf(CONTEXT->error_buffer, sizeof(CONTEXT->error_buffer), + "regparm is invalid on s390."); + CONTEXT->last_error = CONTEXT->error_buffer; +%} |