645 lines
17 KiB
ArmAsm
645 lines
17 KiB
ArmAsm
#include "newlib.h"
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#include "arm.h"
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#include "swi.h"
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/* ANSI concatenation macros. */
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#define CONCAT(a, b) CONCAT2(a, b)
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#define CONCAT2(a, b) a ## b
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#ifdef __USER_LABEL_PREFIX__
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#define FUNCTION( name ) CONCAT (__USER_LABEL_PREFIX__, name)
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#else
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#error __USER_LABEL_PREFIX is not defined
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#endif
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#ifdef _HAVE_INITFINI_ARRAY
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#define _init __libc_init_array
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#define _fini __libc_fini_array
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#endif
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#if defined(__ARM_EABI__) && defined(__thumb__) && !defined(__thumb2__)
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/* For Thumb1 we need to force the architecture to be sure that we get the
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correct attributes on the object file; otherwise the assembler will get
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confused and mark the object as being v6T2. */
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#if defined(__ARM_ARCH_4T__)
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.arch armv4t
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#elif defined(__ARM_ARCH_5T__) || defined(__ARM_ARCH_5TE__)
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/* Nothing in this object requires higher than v5. */
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.arch armv5t
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#elif defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \
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|| defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) \
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|| defined(__ARM_ARCH_6ZK__)
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/* Nothing in this object requires higher than v6. */
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.arch armv6
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#elif defined(__ARM_ARCH_6M__)
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#ifdef ARM_RDP_MONITOR
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/* Object file uses SVC, so mark as v6s-m. */
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.arch armv6s-m
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#else
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.arch armv6-m
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#endif
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#endif
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#endif
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/* .text is used instead of .section .text so it works with arm-aout too. */
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.text
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.syntax unified
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#ifdef PREFER_THUMB
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.thumb
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.macro FUNC_START name
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.global \name
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.type \name, %function
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.thumb_func
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\name:
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.endm
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#else
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.code 32
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.macro FUNC_START name
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.global \name
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.type \name, %function
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\name:
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.endm
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#endif
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/* Annotation for EABI unwinding tables. */
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.macro FN_EH_START
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#if defined(__ELF__) && !defined(__USING_SJLJ_EXCEPTIONS__)
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.fnstart
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#endif
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.endm
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.macro FN_EH_END
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#if defined(__ELF__) && !defined(__USING_SJLJ_EXCEPTIONS__)
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/* Protect against unhandled exceptions. */
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.cantunwind
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.fnend
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#endif
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.endm
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.macro indirect_call reg
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#ifdef HAVE_CALL_INDIRECT
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blx \reg
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#else
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mov lr, pc
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mov pc, \reg
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#endif
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.endm
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/* For armv4t and newer, toolchains will transparently convert
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'bx lr' to 'mov pc, lr' if needed. GCC has deprecated support
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for anything older than armv4t, but this should handle that
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corner case in case anyone needs it anyway. */
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.macro FN_RETURN
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#if __ARM_ARCH <= 4 && __ARM_ARCH_ISA_THUMB == 0
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mov pc, lr
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#else
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bx lr
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#endif
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.endm
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/******************************************************************************
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* User mode only: This routine makes default target specific Stack
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* +-----+ <- SL_sys, Pointer initialization for different processor modes:
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* | | SL_usr FIQ, Abort, IRQ, Undefined, Supervisor, System (User)
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* | SYS | and setups a default Stack Limit in-case the code has
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* | USR | -=0x10000 been compiled with "-mapcs-stack-check" for FIQ and
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* | | System (User) modes.
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* | |
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* +-----+ <- initial SP,
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* becomes SP_sys Hard-wiring SL value is not ideal, since there is
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* and SL_usr currently no support for checking that the heap and
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* stack have not collided, or that this default 64k is
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* All modes: is enough for the program being executed. However,
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* +-----+ <- SL_sys, it ensures that this simple crt0 world will not
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* | | SL_usr immediately cause an overflow event.
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* | SYS |
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* | USR | -=0x10000 We go through all execution modes and set up SP
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* | | for each of them.
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* +-----+ <- SP_sys,
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* | | SP_usr Notes:
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* | SVC | -= 0x8000 - This code will not work as intended if the system
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* | | starts in secure mode. In particular the methods
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* +-----+ <- SP_svc of getting in and out of secure state are not as
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* | | simple as writing to the CPSR mode bits.
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* | IRQ | -= 0x2000 - Mode switch via CPSR is not allowed once in
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* | | non-privileged mode or in hypervisor mode, so we
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* ^ +-----+ <- SP_und take care not to enter "User" or "Hypervisor" mode
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* s | | to set up its SP, and also skip most operations if
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* t | UND | -= 0x1000 already in these modes.
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* a | | Input parameters:
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* c +-----+ <- SP_und - sp - Initialized SP
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* k | | - r2 - May contain SL value from semihosting
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* | ABT | -= 0x1000 SYS_HEAPINFO call
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* g | | Scratch registers:
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* r +-----+ <- SP_abt, - r1 - new value of CPSR
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* o | | SL_fiq - r2 - intermediate value (in standalone mode)
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* w | FIQ | -= 0x1000 - r3 - new SP value
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* t | | - r4 - save/restore CPSR on entry/exit
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* h +-----+ <- initial SP,
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* becomes SP_fiq Declared as "weak" so that user can write and use
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* his own implementation if current doesn't fit.
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*
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******************************************************************************/
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.align 0
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FUNC_START _stack_init
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.weak FUNCTION (_stack_init)
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FN_EH_START
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/* M profile doesn't have CPSR register. */
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#if (__ARM_ARCH_PROFILE != 'M')
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/* Following code is compatible for both ARM and Thumb ISA. */
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mrs r4, CPSR
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mov r3, sp /* Save input SP value. */
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ands r1, r4, #(CPSR_M_MASK)
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beq .Lskip_cpu_modes
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cmp r1, #(CPSR_M_HYP)
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beq .Lskip_cpu_modes
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/* FIQ mode, interrupts disabled. */
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mov r1, #(CPSR_M_FIQ|CPSR_M_32BIT|CPSR_I_MASK|CPSR_F_MASK)
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msr CPSR_c, r1
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mov sp, r3
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sub sl, sp, #0x1000 /* FIQ mode has its own SL. */
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/* Abort mode, interrupts disabled. */
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mov r3, sl
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mov r1, #(CPSR_M_ABT|CPSR_M_32BIT|CPSR_I_MASK|CPSR_F_MASK)
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msr CPSR_c, r1
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mov sp, r3
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sub r3, r3, #0x1000
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/* Undefined mode, interrupts disabled. */
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mov r1, #(CPSR_M_UND|CPSR_M_32BIT|CPSR_I_MASK|CPSR_F_MASK)
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msr CPSR_c, r1
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mov sp, r3
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sub r3, r3, #0x1000
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/* IRQ mode, interrupts disabled. */
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mov r1, #(CPSR_M_IRQ|CPSR_M_32BIT|CPSR_I_MASK|CPSR_F_MASK)
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msr CPSR_c, r1
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mov sp, r3
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sub r3, r3, #0x2000
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/* Supervisory mode, interrupts disabled. */
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mov r1, #(CPSR_M_SVR|CPSR_M_32BIT|CPSR_I_MASK|CPSR_F_MASK)
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msr CPSR_c, r1
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mov sp, r3
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sub r3, r3, #0x8000 /* Min size 32k. */
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bic r3, r3, #0x00FF /* Align with current 64k block. */
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bic r3, r3, #0xFF00
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# if __ARM_ARCH >= 4
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/* System (shares regs with User) mode, interrupts disabled. */
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mov r1, #(CPSR_M_SYS|CPSR_M_32BIT|CPSR_I_MASK|CPSR_F_MASK)
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msr CPSR_c, r1
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mov sp, r3
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# else
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/* Keep this for ARMv3, but GCC actually dropped it. */
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/* Move value into user mode SP without changing modes, */
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/* via '^' form of ldm. */
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str r3, [r3, #-4]
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ldmdb r3, {sp}^
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# endif
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/* Back to original mode, presumably SVC, with diabled FIQ/IRQ. */
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orr r4, r4, #(CPSR_I_MASK|CPSR_F_MASK)
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msr CPSR_c, r4
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.Lskip_cpu_modes:
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#endif
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/* Set SL register. */
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#if defined (ARM_RDI_MONITOR) /* semihosting */
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cmp r2, #0
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beq .Lsl_forced_zero
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/* Allow slop for stack overflow handling and small frames. */
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# ifdef THUMB1_ONLY
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adds r2, #128
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adds r2, #128
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mov sl, r2
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# else
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add sl, r2, #256
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# endif
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.Lsl_forced_zero:
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#else /* standalone */
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/* r3 contains SP for System/User mode. Set SL = SP - 0x10000. */
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#ifdef THUMB1_ONLY
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movs r2, #64
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lsls r2, r2, #10
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subs r2, r3, r2
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mov sl, r2
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#else
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/* Still assumes 256bytes below SL. */
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sub sl, r3, #64 << 10
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#endif
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#endif
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FN_RETURN
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FN_EH_END
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/*******************************************************************************
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* Main library startup code.
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*******************************************************************************/
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.align 0
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FUNC_START _mainCRTStartup
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FUNC_START _start
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FN_EH_START
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/* __ARM_ARCH_PROFILE is defined from GCC 4.8 onwards, however __ARM_ARCH_7A
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has been defined since 4.2 onwards, which is when v7-a support was added
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and hence 'A' profile support was added in the compiler. Allow for this
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file to be built with older compilers. We only call this for A profile
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cores. */
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#if defined (__ARM_ARCH_7A__) || (__ARM_ARCH_PROFILE == 'A')
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/* The init hook does not use the stack and is called before the stack has been set up. */
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#ifdef ARM_RDI_MONITOR
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bl _rdimon_hw_init_hook
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.weak FUNCTION (_rdimon_hw_init_hook)
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#endif
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#endif
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/* Start by setting up a stack. */
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#ifdef ARM_RDP_MONITOR
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/* Issue Demon SWI to read stack info. */
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swi SWI_GetEnv /* Returns command line in r0. */
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mov sp,r1 /* and the highest memory address in r1. */
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/* Stack limit is at end of data. */
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/* Allow slop for stack overflow handling and small frames. */
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#ifdef THUMB1_ONLY
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ldr r0, .LC2
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adds r0, #128
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adds r0, #128
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mov sl, r0
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#else
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ldr sl, .LC2
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add sl, sl, #256
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#endif
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#else
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#ifdef ARM_RDI_MONITOR
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/* Issue Angel SWI to read stack info. */
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movs r0, #AngelSWI_Reason_HeapInfo
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adr r1, .LC0 /* Point at ptr to 4 words to receive data. */
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#ifdef THUMB_VXM
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bkpt AngelSWI
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#elif defined(__thumb2__)
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/* We are in thumb mode for startup on armv7 architectures. */
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AngelSWIAsm (AngelSWI)
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#else
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/* We are always in ARM mode for startup on pre armv7 archs. */
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AngelSWIAsm (AngelSWI_ARM)
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#endif
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ldr r0, .LC0 /* Point at values read. */
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/* Set __heap_limit. */
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ldr r1, [r0, #4]
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cmp r1, #0
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beq .LC33
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ldr r2, =__heap_limit
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str r1, [r2]
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.LC33:
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ldr r1, [r0, #0]
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cmp r1, #0
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bne .LC32
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/* If the heap base value [r0, #0] is 0 then the heap base is actually
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at the end of program data (i.e. __end__). See:
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http://infocenter.arm.com/help/topic/com.arm.doc.dui0471-/Bacbefaa.html
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for more information. */
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ldr r1, .LC31
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str r1, [r0, #0]
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.LC32:
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ldr r1, [r0, #8]
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ldr r2, [r0, #12]
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/* We skip setting SP/SL if 0 returned from semihosting.
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- According to semihosting docs, if 0 returned from semihosting,
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the system was unable to calculate the real value, so it's ok
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to skip setting SP/SL to 0 here.
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- Considering M-profile processors, We might want to initialize
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SP by the first entry of vector table and return 0 to SYS_HEAPINFO
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semihosting call, which will be skipped here.
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- Considering R-profile processors there is no automatic SP init by hardware
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so we need to initialize it by default value. */
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ldr r3, .Lstack
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cmp r1, #0
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beq .LC26
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mov r3, r1
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.LC26:
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mov sp, r3
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/* r2 (SL value) will be used in _stack_init. */
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bl FUNCTION (_stack_init)
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#else /* standalone */
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/* Set up the stack pointer to a fixed value. */
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/* Changes by toralf:
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- Allow linker script to provide stack via __stack symbol - see
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defintion of .Lstack
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- Provide "hooks" that may be used by the application to add
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custom init code - see .Lhwinit and .Lswinit. */
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ldr r3, .Lstack
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cmp r3, #0
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#ifdef __thumb2__
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it eq
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#endif
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#ifdef THUMB1_ONLY
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bne .LC28
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ldr r3, .LC0
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.LC28:
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#else
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ldreq r3, .LC0
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#endif
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/* Note: This 'mov' is essential when starting in User, and ensures we
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always get *some* SP value for the initial mode, even if we
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have somehow missed it below (in which case it gets the same
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value as FIQ - not ideal, but better than nothing). */
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mov sp, r3
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/* We don't care of r2 value in standalone. */
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bl FUNCTION (_stack_init)
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#endif
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#endif
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/* Zero the memory in the .bss section. */
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movs a2, #0 /* Second arg: fill value. */
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mov fp, a2 /* Null frame pointer. */
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mov r7, a2 /* Null frame pointer for Thumb. */
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ldr a1, .LC1 /* First arg: start of memory block. */
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ldr a3, .LC2
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subs a3, a3, a1 /* Third arg: length of block. */
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#if __thumb__ && !defined(PREFER_THUMB)
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/* Enter Thumb mode... */
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add a4, pc, #1 /* Get the address of the Thumb block. */
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bx a4 /* Go there and start Thumb decoding. */
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.code 16
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.global __change_mode
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.thumb_func
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__change_mode:
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#endif
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bl FUNCTION (memset)
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#if !defined (ARM_RDP_MONITOR) && !defined (ARM_RDI_MONITOR)
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/* Changes by toralf: Taken from libgloss/m68k/crt0.S
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initialize target specific stuff. Only execute these
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functions it they exist. */
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ldr r3, .Lhwinit
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cmp r3, #0
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beq .LC24
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indirect_call r3
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.LC24:
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ldr r3, .Lswinit
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cmp r3, #0
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beq .LC25
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indirect_call r3
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.LC25:
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movs r0, #0 /* No arguments. */
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movs r1, #0 /* No argv either. */
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#else
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/* Need to set up standard file handles. */
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bl FUNCTION (initialise_monitor_handles)
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#ifdef ARM_RDP_MONITOR
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swi SWI_GetEnv /* Sets r0 to point to the command line. */
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movs r1, r0
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#else
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movs r0, #AngelSWI_Reason_GetCmdLine
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ldr r1, .LC30 /* Space for command line. */
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AngelSWIAsm (AngelSWI)
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ldr r1, .LC30
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ldr r1, [r1]
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#endif
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/* Parse string at r1. */
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movs r0, #0 /* Count of arguments so far. */
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/* Push a NULL argument onto the end of the list. */
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#ifdef __thumb__
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push {r0}
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#else
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stmfd sp!, {r0}
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#endif
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.LC10:
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/* Skip leading blanks. */
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#ifdef __thumb__
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ldrb r3, [r1]
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adds r1, #1
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#else
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ldrb r3, [r1], #1
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#endif
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cmp r3, #0
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beq .LC12
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cmp r3, #' '
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beq .LC10
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/* See whether we are scanning a string. */
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cmp r3, #'\"'
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#ifdef __thumb__
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beq .LC20
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cmp r3, #'\''
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bne .LC21
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.LC20:
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movs r2, r3
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b .LC22
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.LC21:
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movs r2, #' ' /* Terminator type. */
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subs r1, r1, #1 /* Adjust back to point at start char. */
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.LC22:
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#else
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cmpne r3, #'\''
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moveq r2, r3
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movne r2, #' ' /* Terminator type. */
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subne r1, r1, #1 /* Adjust back to point at start char. */
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#endif
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/* Stack a pointer to the current argument. */
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#ifdef __thumb__
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push {r1}
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#else
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stmfd sp!, {r1}
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#endif
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adds r0, r0, #1
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.LC11:
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#ifdef __thumb__
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ldrb r3, [r1]
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adds r1, #1
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#else
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ldrb r3, [r1], #1
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#endif
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cmp r3, #0
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beq .LC12
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cmp r2, r3 /* Reached terminator ? */
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bne .LC11
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movs r2, #0
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subs r3, r1, #1
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strb r2, [r3] /* Terminate the arg string. */
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b .LC10
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.LC12:
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mov r1, sp /* Point at stacked arg pointers. */
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/* We've now got the stacked args in order, reverse them. */
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#ifdef __thumb__
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movs r2, r0
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lsls r2, #2
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add r2, sp
|
|
mov r3, sp
|
|
.LC15: cmp r2, r3
|
|
bls .LC14
|
|
subs r2, #4
|
|
ldr r4, [r2]
|
|
ldr r5, [r3]
|
|
str r5, [r2]
|
|
str r4, [r3]
|
|
adds r3, #4
|
|
b .LC15
|
|
.LC14:
|
|
/* Ensure doubleword stack alignment. */
|
|
mov r4, sp
|
|
movs r5, #7
|
|
bics r4, r5
|
|
mov sp, r4
|
|
#else
|
|
add r2, sp, r0, LSL #2 /* End of args. */
|
|
mov r3, sp /* Start of args. */
|
|
.LC13: cmp r2, r3
|
|
ldrhi r4,[r2, #-4] /* Reverse ends of list. */
|
|
ldrhi r5, [r3]
|
|
strhi r5, [r2, #-4]!
|
|
strhi r4, [r3], #4
|
|
bhi .LC13
|
|
/* Ensure doubleword stack alignment. */
|
|
bic sp, sp, #7
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef __USES_INITFINI__
|
|
/* Some arm/elf targets use the .init and .fini sections
|
|
to create constructors and destructors, and for these
|
|
targets we need to call the _init function and arrange
|
|
for _fini to be called at program exit. */
|
|
movs r4, r0
|
|
movs r5, r1
|
|
#ifdef _LITE_EXIT
|
|
/* Make reference to atexit weak to avoid unconditionally pulling in
|
|
support code. Refer to comments in __atexit.c for more details. */
|
|
.weak FUNCTION(atexit)
|
|
ldr r0, .Latexit
|
|
cmp r0, #0
|
|
beq .Lweak_atexit
|
|
#endif
|
|
ldr r0, .Lfini
|
|
bl FUNCTION (atexit)
|
|
.Lweak_atexit:
|
|
bl FUNCTION (_init)
|
|
movs r0, r4
|
|
movs r1, r5
|
|
#endif
|
|
bl FUNCTION (main)
|
|
|
|
bl FUNCTION (exit) /* Should not return. */
|
|
|
|
#if __thumb__ && !defined(PREFER_THUMB)
|
|
/* Come out of Thumb mode. This code should be redundant. */
|
|
mov a4, pc
|
|
bx a4
|
|
|
|
.code 32
|
|
.global change_back
|
|
change_back:
|
|
/* Halt the execution. This code should never be executed. */
|
|
/* With no debug monitor, this probably aborts (eventually).
|
|
With a Demon debug monitor, this halts cleanly.
|
|
With an Angel debug monitor, this will report 'Unknown SWI'. */
|
|
swi SWI_Exit
|
|
#endif
|
|
|
|
FN_EH_END
|
|
|
|
/* For Thumb, constants must be after the code since only
|
|
positive offsets are supported for PC relative addresses. */
|
|
.align 0
|
|
.LC0:
|
|
#ifdef ARM_RDI_MONITOR
|
|
.word HeapBase
|
|
#else
|
|
#ifndef ARM_RDP_MONITOR
|
|
/* Changes by toralf: Provide alternative "stack" variable whose value
|
|
may be defined externally; .Lstack will be used instead of .LC0 if
|
|
it points to a non-0 value. Also set up references to "hooks" that
|
|
may be used by the application to provide additional init code. */
|
|
#ifdef __pe__
|
|
.word 0x800000
|
|
#else
|
|
.word 0x80000 /* Top of RAM on the PIE board. */
|
|
#endif
|
|
.Lhwinit:
|
|
.word FUNCTION (hardware_init_hook)
|
|
.Lswinit:
|
|
.word FUNCTION (software_init_hook)
|
|
|
|
/* Set up defaults for the above variables in the form of weak symbols
|
|
- so that application will link correctly, and get value 0 in
|
|
runtime (meaning "ignore setting") for the variables, when the user
|
|
does not provide the symbols. (The linker uses a weak symbol if,
|
|
and only if, a normal version of the same symbol isn't provided
|
|
e.g. by a linker script or another object file.) */
|
|
|
|
.weak FUNCTION (hardware_init_hook)
|
|
.weak FUNCTION (software_init_hook)
|
|
#endif
|
|
|
|
#endif
|
|
|
|
.Lstack:
|
|
.word __stack
|
|
.weak __stack
|
|
|
|
.LC1:
|
|
.word __bss_start__
|
|
.LC2:
|
|
.word __bss_end__
|
|
#ifdef __USES_INITFINI__
|
|
#ifdef _LITE_EXIT
|
|
.Latexit:
|
|
.word FUNCTION(atexit)
|
|
|
|
/* Weak reference _fini in case of lite exit. */
|
|
.weak FUNCTION(_fini)
|
|
#endif
|
|
.Lfini:
|
|
.word FUNCTION(_fini)
|
|
#endif
|
|
#ifdef ARM_RDI_MONITOR
|
|
.LC30:
|
|
.word AngelSWIArgs
|
|
.LC31:
|
|
.word __end__
|
|
|
|
/* Workspace for Angel calls. */
|
|
.data
|
|
/* Data returned by monitor SWI. */
|
|
.global __stack_base__
|
|
HeapBase: .word 0
|
|
HeapLimit: .word 0
|
|
__stack_base__: .word 0
|
|
StackLimit: .word 0
|
|
CommandLine: .space 256,0 /* Maximum length of 255 chars handled. */
|
|
AngelSWIArgs:
|
|
.word CommandLine
|
|
.word 255
|
|
#endif
|
|
|
|
#ifdef __pe__
|
|
.section .idata$3
|
|
.long 0,0,0,0,0,0,0,0
|
|
#endif
|