Hi, all
I have read the code about syscall in file entry.S and didn't known what's a fast syscall.
And why line 1322 can distinguish it through "andcc" (there %l7 is the sys_* funtions' address?) ?
Thanks .
1313 .globl linux_sparc_syscall
1314linux_sparc_syscall:
1315 sethi %hi(PSR_SYSCALL), %l4
1316 or %l0, %l4, %l0
1317 /* Direct access to user regs, must faster. */
1318 cmp %g1, NR_SYSCALLS
1319 bgeu linux_sparc_ni_syscall
1320 sll %g1, 2, %l4
1321 ld [%l7 + %l4], %l7
1322 andcc %l7, 1, %g0
1323 bne linux_fast_syscall
1324 /* Just do first insn from SAVE_ALL in the delay slot */
---
Best regards
Bo Liu
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