Define PSEUDO_ERRVAL, SYSCALL_ERROR_LABEL under all conditions,
INTERNAL_SYSCALL_DECL, INTERNAL_SYSCALL_ERROR_P, INTERNAL_SYSCALL_ERRNO, INTERNAL_SYSCALL, and undef JUMPTARGET before use. [PIC]: Save pic register around syscall.
This commit is contained in:
Ulrich Drepper
parent
5420f85dbe
commit
f19a935e1b
@ -31,6 +31,20 @@
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#undef SYS_ify
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#define SYS_ify(syscall_name) (__NR_##syscall_name)
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#ifdef PIC
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/* WARNING: CANNOT BE USED IN A NOP! */
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# define STW_PIC stw %r19, -32(%sr0, %sp) ASM_LINE_SEP
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# define LDW_PIC ldw -32(%sr0, %sp), %r19 ASM_LINE_SEP
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# define STW_ASM_PIC " copy %%r19, %%r4\n"
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# define LDW_ASM_PIC " copy %%r4, %%r19\n"
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# define USING_GR4 "%r4",
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#else
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# define STW_PIC ASM_LINE_SEP
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# define LDW_PIC ASM_LINE_SEP
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# define STW_ASM_PIC " \n"
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# define LDW_ASM_PIC " \n"
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# define USING_GR4
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#endif
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#ifdef __ASSEMBLER__
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@ -77,20 +91,13 @@
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.text ASM_LINE_SEP \
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.export C_SYMBOL_NAME(name) ASM_LINE_SEP \
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.type C_SYMBOL_NAME(name),@function ASM_LINE_SEP \
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C_LABEL(name) \
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CALL_MCOUNT
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#define ret \
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bv 0(2) ASM_LINE_SEP \
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nop
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#define ret_NOERRNO \
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bv 0(2) ASM_LINE_SEP \
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nop
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C_LABEL(name) ASM_LINE_SEP \
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CALL_MCOUNT ASM_LINE_SEP
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#undef END
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#define END(name) \
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1: .size C_SYMBOL_NAME(name),1b-C_SYMBOL_NAME(name)
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1: ASM_LINE_SEP \
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.size C_SYMBOL_NAME(name),1b-C_SYMBOL_NAME(name) ASM_LINE_SEP
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/* If compiled for profiling, call `mcount' at the start of each function. */
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/* No, don't bother. gcc will put the call in for us. */
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@ -113,24 +120,80 @@
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#define PSEUDO(name, syscall_name, args) \
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ENTRY (name) \
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DO_CALL(syscall_name, args) ASM_LINE_SEP \
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nop
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nop ASM_LINE_SEP
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#define ret \
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/* Return value set by ERRNO code */ ASM_LINE_SEP \
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bv 0(2) ASM_LINE_SEP \
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nop ASM_LINE_SEP
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#undef PSEUDO_END
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#define PSEUDO_END(name) \
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END (name)
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/* We don't set the errno on the return from the syscall */
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#define PSEUDO_NOERRNO(name, syscall_name, args) \
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ENTRY (name) \
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DO_CALL(syscall_name, args) ASM_LINE_SEP \
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nop
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DO_CALL_NOERRNO(syscall_name, args) ASM_LINE_SEP \
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nop ASM_LINE_SEP
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#define ret_NOERRNO ret
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#undef PSEUDO_END_NOERRNO
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#define PSEUDO_END_NOERRNO(name) \
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END (name)
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/* This has to return the error value */
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#undef PSEUDO_ERRVAL
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#define PSEUDO_ERRVAL(name, syscall_name, args) \
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ENTRY(name) \
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DO_CALL_ERRVAL(syscall_name, args) ASM_LINE_SEP \
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nop ASM_LINE_SEP
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#define ret_ERRVAL ret
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#undef PSEUDO_END_ERRVAL
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#define PSEUDO_END_ERRVAL(name) \
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END(name)
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#undef JUMPTARGET
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#define JUMPTARGET(name) name
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#define SYSCALL_PIC_SETUP /* Nothing. */
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/* All the syscall assembly macros rely on finding the approriate
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SYSCALL_ERROR_LABEL or rather HANDLER. */
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/* int * __errno_location(void) so you have to store your value
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into the return address! */
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#define DEFAULT_SYSCALL_ERROR_HANDLER \
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.import __errno_location,code ASM_LINE_SEP \
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/* branch to errno handler */ ASM_LINE_SEP \
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bl __errno_location,%rp ASM_LINE_SEP
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/* Here are the myriad of configuration options that the above can
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work for... what we've done is provide the framework for future
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changes if required to each section */
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#ifdef PIC
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# if RTLD_PRIVATE_ERRNO
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# define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
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# else /* !RTLD_PRIVATE_ERRNO */
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# if defined _LIBC_REENTRANT
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# define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
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# else /* !_LIBC_REENTRANT */
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# define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
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# endif /* _LIBC_REENTRANT */
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# endif /* RTLD_PRIVATE_ERRNO */
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#else
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# ifndef _LIBC_REENTRANT
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# define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
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# else
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# define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
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# endif
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#endif
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/* Linux takes system call arguments in registers:
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syscall number gr20
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arg 1 gr26
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@ -159,25 +222,61 @@
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#undef DO_CALL
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#define DO_CALL(syscall_name, args) \
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DOARGS_##args \
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DOARGS_##args ASM_LINE_SEP \
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STW_PIC ASM_LINE_SEP \
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/* Do syscall, delay loads # */ ASM_LINE_SEP \
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ble 0x100(%sr2,%r0) ASM_LINE_SEP \
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ldi SYS_ify (syscall_name), %r20 ASM_LINE_SEP \
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ldi -0x1000,%r1 ASM_LINE_SEP \
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cmpb,>>=,n %r1,%ret0,0f ASM_LINE_SEP \
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stw %rp, -20(%sr0,%r30) ASM_LINE_SEP \
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stw %ret0, -24(%sr0,%r30) ASM_LINE_SEP \
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.import __errno_location,code ASM_LINE_SEP \
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bl __errno_location,%rp ASM_LINE_SEP \
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ldo 64(%r30), %r30 ASM_LINE_SEP \
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ldo -64(%r30), %r30 ASM_LINE_SEP \
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ldw -24(%r30), %r26 ASM_LINE_SEP \
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/* save rp or we get lost */ ASM_LINE_SEP \
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stw %rp, -20(%sr0,%sp) ASM_LINE_SEP \
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/* Restore r19 from frame */ ASM_LINE_SEP \
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LDW_PIC ASM_LINE_SEP \
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stw %ret0, -24(%sr0,%sp) ASM_LINE_SEP \
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SYSCALL_ERROR_HANDLER ASM_LINE_SEP \
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/* create frame */ ASM_LINE_SEP \
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ldo 64(%sp), %sp ASM_LINE_SEP \
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ldo -64(%sp), %sp ASM_LINE_SEP \
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/* OPTIMIZE: Don't reload r19 */ ASM_LINE_SEP \
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/* do a -1*syscall_ret0 */ ASM_LINE_SEP \
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ldw -24(%sr0,%sp), %r26 ASM_LINE_SEP \
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sub %r0, %r26, %r26 ASM_LINE_SEP \
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/* Store into errno location */ ASM_LINE_SEP \
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stw %r26, 0(%sr0,%ret0) ASM_LINE_SEP \
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/* return -1 as error */ ASM_LINE_SEP \
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ldo -1(%r0), %ret0 ASM_LINE_SEP \
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ldw -20(%r30), %rp ASM_LINE_SEP \
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ldw -20(%sr0,%sp), %rp ASM_LINE_SEP \
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0: ASM_LINE_SEP \
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UNDOARGS_##args ASM_LINE_SEP
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/* We do nothing with the return, except hand it back to someone else */
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#undef DO_CALL_NOERRNO
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#define DO_CALL_NOERRNO(syscall_name, args) \
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DOARGS_##args \
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/* No need to store r19 */ ASM_LINE_SEP \
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ble 0x100(%sr2,%r0) ASM_LINE_SEP \
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ldi SYS_ify (syscall_name), %r20 ASM_LINE_SEP \
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/* Caller will restore r19 */ ASM_LINE_SEP \
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UNDOARGS_##args
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/* Here, we return the ERRVAL in assembly, note we don't call the
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error handler function, but we do 'negate' the return _IF_
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it's an error. Not sure if this is the right semantic. */
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#undef DO_CALL_ERRVAL
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#define DO_CALL_ERRVAL(syscall_name, args) \
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DOARGS_##args ASM_LINE_SEP \
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/* No need to store r19 */ ASM_LINE_SEP \
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ble 0x100(%sr2,%r0) ASM_LINE_SEP \
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ldi SYS_ify (syscall_name), %r20 ASM_LINE_SEP \
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/* Caller will restore r19 */ ASM_LINE_SEP \
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ldi -0x1000,%r1 ASM_LINE_SEP \
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cmpb,>>=,n %r1,%ret0,0f ASM_LINE_SEP \
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sub %r0, %ret0, %ret0 ASM_LINE_SEP \
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0: ASM_LINE_SEP \
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UNDOARGS_##args ASM_LINE_SEP
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#define DOARGS_0 /* nothing */
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#define DOARGS_1 /* nothing */
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#define DOARGS_2 /* nothing */
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@ -198,19 +297,37 @@
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#else
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/* GCC has to be warned that a syscall may clobber all the ABI
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registers listed as "caller-saves", see page 8, Table 2
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in section 2.2.6 of the PA-RISC RUN-TIME architecture
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document. However! r28 is the result and will conflict with
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the clobber list so it is left out. Also the input arguments
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registers r20 -> r26 will conflict with the list so they
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are treated specially. Although r19 is clobbered by the syscall
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we cannot say this because it would violate ABI, thus we say
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r4 is clobbered and use that register to save/restore r19
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across the syscall. */
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#define CALL_CLOB_REGS "%r1", "%r2", USING_GR4 \
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"%r20", "%r29", "%r31"
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#undef INLINE_SYSCALL
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#define INLINE_SYSCALL(name, nr, args...) ({ \
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long __sys_res; \
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{ \
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register unsigned long __res asm("r28"); \
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LOAD_ARGS_##nr(args) \
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/* FIXME: HACK stw/ldw r19 around syscall */ \
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asm volatile( \
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"ble 0x100(%%sr2, %%r0)\n\t" \
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" ldi %1, %%r20" \
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STW_ASM_PIC \
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" ble 0x100(%%sr2, %%r0)\n" \
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" ldi %1, %%r20\n" \
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LDW_ASM_PIC \
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: "=r" (__res) \
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: "i" (SYS_ify(name)) ASM_ARGS_##nr \
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: CALL_CLOB_REGS CLOB_ARGS_##nr \
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); \
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__sys_res = __res; \
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__sys_res = (long)__res; \
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} \
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if ( (unsigned long)__sys_res >= (unsigned long)-4095 ){ \
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__set_errno(-__sys_res); \
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@ -219,6 +336,49 @@
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__sys_res; \
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})
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/* INTERNAL_SYSCALL_DECL - Allows us to setup some function static
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value to use within the context of the syscall
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INTERNAL_SYSCALL_ERROR_P - Returns 0 if it wasn't an error, 1 otherwise
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You are allowed to use the syscall result (val) and the DECL error variable
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to determine what went wrong.
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INTERLAL_SYSCALL_ERRNO - Munges the val/err pair into the error number.
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In our case we just flip the sign. */
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#undef INTERNAL_SYSCALL_DECL
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#define INTERNAL_SYSCALL_DECL(err) do { } while (0)
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/* Equivalent to (val < 0)&&(val > -4095) which is what we want */
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#undef INTERNAL_SYSCALL_ERROR_P
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#define INTERNAL_SYSCALL_ERROR_P(val, err) \
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((unsigned long)val >= (unsigned long)-4095)
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#undef INTERNAL_SYSCALL_ERRNO
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#define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
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/* Similar to INLINE_SYSCALL but we don't set errno */
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#undef INTERNAL_SYSCALL
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#define INTERNAL_SYSCALL(name, err, nr, args...) \
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({ \
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long __sys_res; \
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{ \
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register unsigned long __res asm("r28"); \
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LOAD_ARGS_##nr(args) \
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/* FIXME: HACK stw/ldw r19 around syscall */ \
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asm volatile( \
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STW_ASM_PIC \
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" ble 0x100(%%sr2, %%r0)\n" \
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" ldi %1, %%r20\n" \
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LDW_ASM_PIC \
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: "=r" (__res) \
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: "i" (SYS_ify(name)) ASM_ARGS_##nr \
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); \
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: CALL_CLOB_REGS CLOB_ARGS_##nr \
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); \
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__sys_res = (long)__res; \
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} \
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__sys_res; \
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})
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#define LOAD_ARGS_0()
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#define LOAD_ARGS_1(r26) \
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register unsigned long __r26 __asm__("r26") = (unsigned long)r26; \
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@ -239,12 +399,22 @@
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register unsigned long __r21 __asm__("r21") = (unsigned long)r21; \
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LOAD_ARGS_5(r26,r25,r24,r23,r22)
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/* Even with zero args we use r20 for the syscall number */
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#define ASM_ARGS_0
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#define ASM_ARGS_1 , "r" (__r26)
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#define ASM_ARGS_2 , "r" (__r26), "r" (__r25)
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#define ASM_ARGS_3 , "r" (__r26), "r" (__r25), "r" (__r24)
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#define ASM_ARGS_4 , "r" (__r26), "r" (__r25), "r" (__r24), "r" (__r23)
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#define ASM_ARGS_5 , "r" (__r26), "r" (__r25), "r" (__r24), "r" (__r23), "r" (__r22)
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#define ASM_ARGS_6 , "r" (__r26), "r" (__r25), "r" (__r24), "r" (__r23), "r" (__r22), "r" (__r21)
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#define ASM_ARGS_1 ASM_ARGS_0, "r" (__r26)
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#define ASM_ARGS_2 ASM_ARGS_1, "r" (__r25)
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#define ASM_ARGS_3 ASM_ARGS_2, "r" (__r24)
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#define ASM_ARGS_4 ASM_ARGS_3, "r" (__r23)
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#define ASM_ARGS_5 ASM_ARGS_4, "r" (__r22)
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#define ASM_ARGS_6 ASM_ARGS_5, "r" (__r21)
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/* The registers not listed as inputs but clobbered */
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#define CLOB_ARGS_6
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#define CLOB_ARGS_5 CLOB_ARGS_6, "%r21"
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#define CLOB_ARGS_4 CLOB_ARGS_5, "%r22"
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#define CLOB_ARGS_3 CLOB_ARGS_4, "%r23"
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#define CLOB_ARGS_2 CLOB_ARGS_3, "%r24"
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#define CLOB_ARGS_1 CLOB_ARGS_2, "%r25"
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#define CLOB_ARGS_0 CLOB_ARGS_1, "%r26"
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#endif /* __ASSEMBLER__ */
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