8356ef6c96
arm64 performs context-switch in kernel space instead of user space as in x86_64. Change-Id: Ib119b9ff014effb970183ee86cfac67fab773cba Futjitsu: POSTK_DEBUG_ARCH_DEP_99
42 lines
773 B
ArmAsm
42 lines
773 B
ArmAsm
/* archdep.S COPYRIGHT FUJITSU LIMITED 2017-2019 */
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#include <sys/syscall.h>
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/*
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* int switch_ctx(int fd, unsigned long cmd, void **param, void *lctx,
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* void *rctx);
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* <register> : <argument>
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* x0 : int fd
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* x1 : unsigned long cmd
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* x2 : void **param
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* x3 : void *lctx
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* x4 : void *rctx
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*
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* Save and switch the context including TLS.
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*/
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.global switch_ctx
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switch_ctx:
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/* send ioctl(fd, cmd, param) */
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mov w8, #__NR_ioctl
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svc #0x0
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/* if (syscall_ret < 0 && -4095(-MAX_ERRNO) <= syscall_ret) goto 1f; */
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cmp x0, #0xfffffffffffff000
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b.hi 1f
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/* if (syscall_ret != 0) goto 2f; */
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cmp x0, #0x0
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b.ne 2f
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/* function_ret = 0 */
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mov x0, #0x0
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ret
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/* error case */
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1:
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/* function_ret = -1 */
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mov x0, #0xffffffffffffffff
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2:
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ret
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