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mips: Do not include hi and lo in __SYSCALL_CLOBBERS for R6

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GCC 10 (PR 91233) won't silently allow registers that are not architecturally
available to be present in the clobber list anymore, resulting in build failure
for mips*r6 targets in form of:
...
.../sysdep.h:146:2: error: the register ‘lo’ cannot be clobbered in ‘asm’ for the current target
  146 |  __asm__ volatile (      \
      |  ^~~~~~~

This is because base R6 ISA doesn't define hi and lo registers w/o DSP extension.
This patch provides the alternative definitions of __SYSCALL_CLOBBERS for r6
targets that won't include those registers.

	* sysdeps/unix/sysv/linux/mips/mips32/sysdep.h (__SYSCALL_CLOBBERS): Exclude
	hi and lo from the clobber list for __mips_isa_rev >= 6.
	* sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h (__SYSCALL_CLOBBERS): Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n64/sysdep.h (__SYSCALL_CLOBBERS): Likewise.
This commit is contained in:
Dragan Mladjenovic
2019-11-19 15:06:20 +01:00
committed by dragan.mladjenovic
parent f1a0eb5b67
commit 020b2a97bb
3 changed files with 21 additions and 6 deletions
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9
sysdeps/unix/sysv/linux/mips/mips32/sysdep.h
View File

@ -346,8 +346,13 @@ libc_hidden_proto (__mips_syscall7, nomips16)
_sc_ret.reg.v0; \
})
#define __SYSCALL_CLOBBERS "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", \
"$14", "$15", "$24", "$25", "hi", "lo", "memory"
#if __mips_isa_rev >= 6
# define __SYSCALL_CLOBBERS "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", \
"$14", "$15", "$24", "$25", "memory"
#else
# define __SYSCALL_CLOBBERS "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", \
"$14", "$15", "$24", "$25", "hi", "lo", "memory"
#endif
#endif /* __ASSEMBLER__ */

9
sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h
View File

@ -294,8 +294,13 @@
_sys_result; \
})
#define __SYSCALL_CLOBBERS "$1", "$3", "$10", "$11", "$12", "$13", \
"$14", "$15", "$24", "$25", "hi", "lo", "memory"
#if __mips_isa_rev >= 6
# define __SYSCALL_CLOBBERS "$1", "$3", "$10", "$11", "$12", "$13", \
"$14", "$15", "$24", "$25", "memory"
#else
# define __SYSCALL_CLOBBERS "$1", "$3", "$10", "$11", "$12", "$13", \
"$14", "$15", "$24", "$25", "hi", "lo", "memory"
#endif
#endif /* __ASSEMBLER__ */

9
sysdeps/unix/sysv/linux/mips/mips64/n64/sysdep.h
View File

@ -290,8 +290,13 @@
_sys_result; \
})
#define __SYSCALL_CLOBBERS "$1", "$3", "$10", "$11", "$12", "$13", \
"$14", "$15", "$24", "$25", "hi", "lo", "memory"
#if __mips_isa_rev >= 6
# define __SYSCALL_CLOBBERS "$1", "$3", "$10", "$11", "$12", "$13", \
"$14", "$15", "$24", "$25", "memory"
#else
# define __SYSCALL_CLOBBERS "$1", "$3", "$10", "$11", "$12", "$13", \
"$14", "$15", "$24", "$25", "hi", "lo", "memory"
#endif
#endif /* __ASSEMBLER__ */