356d37fb7f
With this change we allocate stack space only for the registers we actually store in the thread interrupt stack frame. Furthermore, no function is called on with the interrupt context save frame %sp so no full frame is needed here. ABI functions are called later in the interrupt trap handler, but that is after the dedicated interrupt stack has been installed. This saves 96 bytes of stack space for each interrupted context. Signed-off-by: Martin Åberg <martin.aberg@gaisler.com>
64 lines
2.5 KiB
C
64 lines
2.5 KiB
C
/*
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* Copyright (c) 2019-2020 Cobham Gaisler AB
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_ARCH_SPARC_CORE_STACK_H_
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#define ZEPHYR_ARCH_SPARC_CORE_STACK_H_
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/*
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* Offsets for SPARC ABI stack frame.
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*
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* Reference: System V Application Binary Interface, SPARC Processor
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* Supplement, Third Edition, Page 3-35.
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*/
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#define STACK_FRAME_L0_OFFSET 0x00
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#define STACK_FRAME_L1_OFFSET 0x04
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#define STACK_FRAME_L2_OFFSET 0x08
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#define STACK_FRAME_L3_OFFSET 0x0c
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#define STACK_FRAME_L4_OFFSET 0x10
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#define STACK_FRAME_L5_OFFSET 0x14
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#define STACK_FRAME_L6_OFFSET 0x18
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#define STACK_FRAME_L7_OFFSET 0x1c
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#define STACK_FRAME_I0_OFFSET 0x20
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#define STACK_FRAME_I1_OFFSET 0x24
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#define STACK_FRAME_I2_OFFSET 0x28
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#define STACK_FRAME_I3_OFFSET 0x2c
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#define STACK_FRAME_I4_OFFSET 0x30
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#define STACK_FRAME_I5_OFFSET 0x34
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#define STACK_FRAME_I6_OFFSET 0x38
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#define STACK_FRAME_I7_OFFSET 0x3c
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#define STACK_FRAME_STRUCTURE_RETURN_ADDRESS_OFFSET 0x40
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#define STACK_FRAME_SAVED_ARG0_OFFSET 0x44
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#define STACK_FRAME_SAVED_ARG1_OFFSET 0x48
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#define STACK_FRAME_SAVED_ARG2_OFFSET 0x4c
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#define STACK_FRAME_SAVED_ARG3_OFFSET 0x50
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#define STACK_FRAME_SAVED_ARG4_OFFSET 0x54
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#define STACK_FRAME_SAVED_ARG5_OFFSET 0x58
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#define STACK_FRAME_PAD0_OFFSET 0x5c
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#define STACK_FRAME_SIZE 0x60
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/* Interrupt stack frame */
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#define ISF_PSR_OFFSET (0x40 + 0x00)
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#define ISF_PC_OFFSET (0x40 + 0x04)
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#define ISF_NPC_OFFSET (0x40 + 0x08)
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#define ISF_G1_OFFSET (0x40 + 0x0c)
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#define ISF_G2_OFFSET (0x40 + 0x10)
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#define ISF_G3_OFFSET (0x40 + 0x14)
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#define ISF_G4_OFFSET (0x40 + 0x18)
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#define ISF_Y_OFFSET (0x40 + 0x1c)
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#if !defined(_FLAT)
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#define ISF_SIZE (0x20)
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#else
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/*
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* The flat ABI stores and loads "local" and "in" registers in the save area as
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* part of function prologue and epilogue. So we allocate space for a new save
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* area (0x40 byte) as part of the interrupt stack frame.
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*/
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#define ISF_SIZE (0x40 + 0x20)
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#endif
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#endif /* ZEPHYR_ARCH_SPARC_CORE_STACK_H_ */
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