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5de29b |
Backport
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37d350073888887637aa67dddf988d9c4b226032 \
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aarch64: Re-implement setcontext without rt_sigreturn syscall
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03ea4d9b6916857e3c2a021f55d2a853cb837398 \
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[AArch64] Simplify getcontext pstate initialization.
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6e445a3d2bdf152ebf57d1c92bfea1828e070743 \
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[AArch64] Ensure getcontext() initializes PSTATE.
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diff --git a/ports/sysdeps/unix/sysv/linux/aarch64/getcontext.S b/ports/sysdeps/unix/sysv/linux/aarch64/getcontext.S
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index aff2e32..70b2e32 100644
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--- a/ports/sysdeps/unix/sysv/linux/aarch64/getcontext.S
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+++ b/ports/sysdeps/unix/sysv/linux/aarch64/getcontext.S
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@@ -1,6 +1,6 @@
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/* Save current context.
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- Copyright (C) 2009-2012 Free Software Foundation, Inc.
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+ Copyright (C) 2009-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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@@ -53,6 +53,9 @@ ENTRY(__getcontext)
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mov x2, sp
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str x2, [x0, oSP]
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+ /* Initialize the pstate. */
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+ str xzr, [x0, oPSTATE]
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+
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/* Figure out where to place the first context extension
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block. */
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add x2, x0, #oEXTENSION
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diff --git a/ports/sysdeps/unix/sysv/linux/aarch64/setcontext.S b/ports/sysdeps/unix/sysv/linux/aarch64/setcontext.S
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index a98f67f..f45a655 100644
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--- a/ports/sysdeps/unix/sysv/linux/aarch64/setcontext.S
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+++ b/ports/sysdeps/unix/sysv/linux/aarch64/setcontext.S
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@@ -1,6 +1,6 @@
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/* Set current context.
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- Copyright (C) 2009-2012 Free Software Foundation, Inc.
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+ Copyright (C) 2009-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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@@ -22,68 +22,108 @@
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#include "ucontext_i.h"
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#include "ucontext-internal.h"
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-/* int setcontext (const ucontext_t *ucp) */
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+/* int __setcontext (const ucontext_t *ucp)
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- .text
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-
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-ENTRY(__setcontext)
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-
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- /* Create a signal frame on the stack:
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-
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- fp
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- lr
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- ...
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- sp-> rt_sigframe
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- */
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-
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- stp x29, x30, [sp, -16]!
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- cfi_adjust_cfa_offset (16)
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- cfi_rel_offset (x29, 0)
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- cfi_rel_offset (x30, 8)
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-
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- mov x29, sp
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- cfi_def_cfa_register (x29)
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-
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- /* Allocate space for the sigcontext. */
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- mov w3, #((RT_SIGFRAME_SIZE + SP_ALIGN_SIZE) & SP_ALIGN_MASK)
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- sub sp, sp, x3
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+ Restores the machine context in UCP and thereby resumes execution
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+ in that context.
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- /* Compute the base address of the ucontext structure. */
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- add x1, sp, #RT_SIGFRAME_UCONTEXT
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+ This implementation is intended to be used for *synchronous* context
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+ switches only. Therefore, it does not have to restore anything
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+ other than the PRESERVED state. */
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- /* Only ucontext is required in the frame, *copy* it in. */
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-
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-#if UCONTEXT_SIZE % 16
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-#error The implementation of setcontext.S assumes sizeof(ucontext_t) % 16 == 0
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-#endif
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-
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- mov x2, #UCONTEXT_SIZE / 16
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-0:
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- ldp x3, x4, [x0], #16
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- stp x3, x4, [x1], #16
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- sub x2, x2, 1
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- cbnz x2, 0b
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+ .text
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- /* rt_sigreturn () -- no arguments, sp points to struct rt_sigframe. */
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- mov x8, SYS_ify (rt_sigreturn)
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+ENTRY (__setcontext)
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+ /* Save a copy of UCP. */
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+ mov x9, x0
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+
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+ /* Set the signal mask with
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+ rt_sigprocmask (SIG_SETMASK, mask, NULL, _NSIG/8). */
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+ mov x0, #SIG_SETMASK
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+ add x1, x9, #UCONTEXT_SIGMASK
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+ mov x2, #0
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+ mov x3, #_NSIG8
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+ mov x8, SYS_ify (rt_sigprocmask)
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svc 0
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-
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- /* Ooops we failed. Recover the stack */
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-
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- mov sp, x29
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- cfi_def_cfa_register (sp)
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-
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- ldp x29, x30, [sp], 16
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- cfi_adjust_cfa_offset (16)
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- cfi_restore (x29)
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- cfi_restore (x30)
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- b C_SYMBOL_NAME(__syscall_error)
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-
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+ cbz x0, 1f
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+ b C_SYMBOL_NAME (__syscall_error)
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+1:
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+ /* Restore the general purpose registers. */
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+ mov x0, x9
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+ cfi_def_cfa (x0, 0)
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+ cfi_offset (x18, oX0 + 18 * SZREG)
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+ cfi_offset (x19, oX0 + 19 * SZREG)
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+ cfi_offset (x20, oX0 + 20 * SZREG)
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+ cfi_offset (x21, oX0 + 21 * SZREG)
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+ cfi_offset (x22, oX0 + 22 * SZREG)
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+ cfi_offset (x23, oX0 + 23 * SZREG)
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+ cfi_offset (x24, oX0 + 24 * SZREG)
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+ cfi_offset (x25, oX0 + 25 * SZREG)
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+ cfi_offset (x26, oX0 + 26 * SZREG)
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+ cfi_offset (x27, oX0 + 27 * SZREG)
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+ cfi_offset (x28, oX0 + 28 * SZREG)
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+ cfi_offset (x29, oX0 + 29 * SZREG)
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+ cfi_offset (x30, oX0 + 30 * SZREG)
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+
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+ cfi_offset ( d8, oV0 + 8 * SZVREG)
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+ cfi_offset ( d9, oV0 + 9 * SZVREG)
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+ cfi_offset (d10, oV0 + 10 * SZVREG)
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+ cfi_offset (d11, oV0 + 11 * SZVREG)
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+ cfi_offset (d12, oV0 + 12 * SZVREG)
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+ cfi_offset (d13, oV0 + 13 * SZVREG)
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+ cfi_offset (d14, oV0 + 14 * SZVREG)
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+ cfi_offset (d15, oV0 + 15 * SZVREG)
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+ ldp x18, x19, [x0, oX0 + 18 * SZREG]
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+ ldp x20, x21, [x0, oX0 + 20 * SZREG]
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+ ldp x22, x23, [x0, oX0 + 22 * SZREG]
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+ ldp x24, x25, [x0, oX0 + 24 * SZREG]
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+ ldp x26, x27, [x0, oX0 + 26 * SZREG]
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+ ldp x28, x29, [x0, oX0 + 28 * SZREG]
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+ ldr x30, [x0, oX0 + 30 * SZREG]
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+ ldr x2, [x0, oSP]
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+ mov sp, x2
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+
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+ /* Check for FP SIMD context. We don't support restoring
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+ contexts created by the kernel, so this context must have
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+ been created by getcontext. Hence we can rely on the
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+ first extension block being the FP SIMD context. */
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+ add x2, x0, #oEXTENSION
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+
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+ mov w3, #(FPSIMD_MAGIC & 0xffff)
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+ movk w3, #(FPSIMD_MAGIC >> 16), lsl #16
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+ ldr w1, [x2, #oHEAD + oMAGIC]
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+ cmp w1, w3
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+ b.ne 2f
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+
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+ /* Restore the FP SIMD context. */
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+ add x3, x2, #oV0 + 8 * SZVREG
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+ ldp d8, d9, [x3], #2 * SZVREG
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+ ldp d10, d11, [x3], #2 * SZVREG
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+ ldp d12, d13, [x3], #2 * SZVREG
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+ ldp d14, d15, [x3], #2 * SZVREG
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+
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+ add x3, x2, oFPSR
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+
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+ ldr w4, [x3]
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+ msr fpsr, x4
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+
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+ ldr w4, [x3, oFPCR - oFPSR]
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+ msr fpcr, x4
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+
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+2:
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+ ldr x16, [x0, oPC]
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+ /* Restore arg registers. */
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+ ldp x2, x3, [x0, oX0 + 2 * SZREG]
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+ ldp x4, x5, [x0, oX0 + 4 * SZREG]
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+ ldp x6, x7, [x0, oX0 + 6 * SZREG]
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+ ldp x0, x1, [x0, oX0 + 0 * SZREG]
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+ /* Jump to the new pc value. */
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+ br x16
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PSEUDO_END (__setcontext)
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weak_alias (__setcontext, setcontext)
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5de29b |
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-ENTRY(__startcontext)
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+ENTRY (__startcontext)
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mov x0, x19
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cbnz x0, __setcontext
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-1: b HIDDEN_JUMPTARGET(_exit)
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-END(__startcontext)
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+1: b HIDDEN_JUMPTARGET (_exit)
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+END (__startcontext)
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diff --git a/ports/sysdeps/unix/sysv/linux/aarch64/ucontext_i.sym b/ports/sysdeps/unix/sysv/linux/aarch64/ucontext_i.sym
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5de29b |
index 1afff78..ab3930c 100644
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5de29b |
--- a/ports/sysdeps/unix/sysv/linux/aarch64/ucontext_i.sym
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5de29b |
+++ b/ports/sysdeps/unix/sysv/linux/aarch64/ucontext_i.sym
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5de29b |
@@ -37,6 +37,7 @@ STACK_FLAGS stack (ss_flags)
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oX0 mcontext (regs)
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5de29b |
oSP mcontext (sp)
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5de29b |
oPC mcontext (pc)
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+oPSTATE mcontext (pstate)
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5de29b |
oEXTENSION mcontext (__reserved)
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5de29b |
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5de29b |
#define fpsimd_context(member) offsetof (struct fpsimd_context, member)
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