diff options
author | Peng Fan <van.freenix@gmail.com> | 2013-07-18 11:33:55 +0800 |
---|---|---|
committer | Peng Fan <van.freenix@gmail.com> | 2013-07-22 10:51:40 +0800 |
commit | 19b3b6033adfe740038a5cd483f05b7c9273a148 (patch) | |
tree | fb9b4115a78e1a06ddfa1bc88ce7ffb2fe71877f | |
parent | e4b6108400c8df19184fee30beeaa4edde9bca10 (diff) |
ARM Support
Signed-off-by: Peng Fan <van.freenix@gmail.com>
-rw-r--r-- | libbsd/include/arch/arm/machine/elf_machdep.h | 20 | ||||
-rw-r--r-- | rtl-mdreloc-arm.c | 291 | ||||
-rw-r--r-- | testcase/1.c | 106 | ||||
-rw-r--r-- | testcase/2.c | 14 | ||||
-rw-r--r-- | testcase/Readme | 11 | ||||
-rw-r--r-- | testcase/wscript | 32 | ||||
-rw-r--r-- | wscript | 8 |
7 files changed, 408 insertions, 74 deletions
diff --git a/libbsd/include/arch/arm/machine/elf_machdep.h b/libbsd/include/arch/arm/machine/elf_machdep.h index 963ff64..78c88b5 100644 --- a/libbsd/include/arch/arm/machine/elf_machdep.h +++ b/libbsd/include/arch/arm/machine/elf_machdep.h @@ -46,7 +46,7 @@ #define R_ARM_THM_ABS5 7 #define R_ARM_ABS8 8 #define R_ARM_SBREL32 9 -#define R_ARM_THM_PC22 10 +#define R_ARM_THM_CALL 10 #define R_ARM_THM_PC8 11 #define R_ARM_AMP_VCALL9 12 #define R_ARM_SWI24 13 @@ -68,6 +68,10 @@ #define R_ARM_GOTPC 25 #define R_ARM_GOT32 26 #define R_ARM_PLT32 27 +#define R_ARM_CALL 28 +#define R_ARM_JUMP24 29 +#define R_ARM_THM_JUMP24 30 +#define R_ARM_BASE_ABS 31 #define R_ARM_ALU_PCREL_7_0 32 #define R_ARM_ALU_PCREL_15_8 33 @@ -75,12 +79,22 @@ #define R_ARM_ALU_SBREL_11_0 35 #define R_ARM_ALU_SBREL_19_12 36 #define R_ARM_ALU_SBREL_27_20 37 +#define R_ARM_V4BX 40 +#define R_ARM_PREL31 41 + +#define R_ARM_MOVW_ABS_NC 43 +#define R_ARM_MOVT_ABS 44 + +#define R_ARM_THM_MOVW_ABS_NC 47 +#define R_ARM_THM_MOVT_ABS 48 + +#define R_ARM_THM_JUMP19 51 /* 96-111 are reserved to G++. */ #define R_ARM_GNU_VTENTRY 100 #define R_ARM_GNU_VTINHERIT 101 -#define R_ARM_THM_PC11 102 -#define R_ARM_THM_PC9 103 +#define R_ARM_THM_JUMP11 102 +#define R_ARM_THM_JUMP8 103 /* More TLS relocations */ #define R_ARM_TLS_GD32 104 /* PC-rel 32 bit for global dynamic */ diff --git a/rtl-mdreloc-arm.c b/rtl-mdreloc-arm.c index e55da1f..d1bfd5a 100644 --- a/rtl-mdreloc-arm.c +++ b/rtl-mdreloc-arm.c @@ -40,6 +40,18 @@ store_ptr(void *where, Elf_Addr val) memcpy(where, &val, sizeof(val)); } +/* + * The address of Thumb function symbols is it's real address plus one. + * This is done by compiler, thus do not consider symtype here. + */ +static inline int +isThumb(Elf_Word symvalue) +{ + if ((symvalue & 0x1) == 0x1) + return true; + else return false; +} + bool rtems_rtl_elf_rel_resolve_sym (Elf_Word type) { @@ -67,7 +79,10 @@ rtems_rtl_elf_relocate_rel (const rtems_rtl_obj_t* obj, const Elf_Word symvalue) { Elf_Addr *where; - Elf_Addr tmp; + Elf_Addr tmp; + Elf_Word insn, addend; + Elf_Word sign, i1, i2; + uint16_t lower_insn, upper_insn; where = (Elf_Addr *)(sect->base + rel->r_offset); @@ -75,81 +90,221 @@ rtems_rtl_elf_relocate_rel (const rtems_rtl_obj_t* obj, case R_TYPE(NONE): break; -#if 1 /* XXX should not occur */ - case R_TYPE(PC24): { /* word32 S - P + A */ - Elf32_Sword addend; - - /* - * Extract addend and sign-extend if needed. - */ - addend = *where; - if (addend & 0x00800000) - addend |= 0xff000000; - - tmp = (Elf_Addr)sect->base + symvalue - - (Elf_Addr)where + (addend << 2); - - if ((tmp & 0xfe000000) != 0xfe000000 && - (tmp & 0xfe000000) != 0) { - rtems_rtl_set_error (EINVAL, - "R_ARM_PC24 in %s relocation @ %p failed " \ - "(displacement %ld (%#lx) out of range)", - rtems_rtl_obj_oname (obj), where, (long) tmp, (long) tmp); - return false; - } - - tmp >>= 2; - *where = (*where & 0xff000000) | (tmp & 0x00ffffff); + case R_TYPE(CALL): /* BL/BLX */ + case R_TYPE(JUMP24): /* B/BL<cond> */ + insn = *where; + + if (insn & 0x00800000) + addend = insn | 0xff000000; + else addend = insn & 0x00ffffff; + + if (isThumb(symvalue)) { + if ((insn & 0xfe000000) == 0xfa000000); /* Already blx */ + else { + if ((insn & 0xff000000) == 0xeb000000) { /* BL <label> */ + *where = (insn & 0x00ffffff) | 0xfa000000; /* BL-->BLX */ + } else { + printf("JUMP24 is not suppored from arm to thumb\n"); + return false; + } + } + } + + tmp = symvalue + (addend << 2) - (Elf_Addr)where; + tmp = (Elf_Sword)tmp >> 2; + + if (((Elf_Sword)tmp > 0x7fffff) || ((Elf_Sword)tmp < -0x800000)) { + printf("CALL/JUMP24 Overflow\n"); + return false; + } + + *where = (*where & 0xff000000) | (tmp & 0xffffff); + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) - printf ("rtl: PC24 %p @ %p in %s", + printf ("rtl: JUMP24/PC24/CALL %p @ %p in %s\n", (void *)*where, where, rtems_rtl_obj_oname (obj)); - break; - } -#endif - - case R_TYPE(ABS32): /* word32 B + S + A */ - case R_TYPE(GLOB_DAT): /* word32 B + S */ - if (__predict_true(RELOC_ALIGNED_P(where))) { - tmp = *where + (Elf_Addr)sect->base + symvalue; - /* Set the Thumb bit, if needed. */ - if (ELF_ST_TYPE(syminfo) == STT_ARM_TFUNC) + + break; + + case R_TYPE(V4BX): + /* Miscellaneous, ignore */ + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) { + printf ("rtl: V4BX %p @ %p in %s\n", + (void *)*where, where, rtems_rtl_obj_oname (obj)); + } + break; + + case R_TYPE(MOVT_ABS): + case R_TYPE(MOVW_ABS_NC): + insn = *where; + + addend = ((insn >> 4) & 0xf000) | (insn & 0x0fff); + if (addend & 0x8000) + addend |= 0xffff0000; + + tmp = symvalue + addend; + + if (ELF_R_TYPE(rel->r_info) == R_TYPE(MOVW_ABS_NC)) + tmp &= 0xffff; + else { + tmp = (Elf_Sword)tmp >> 16; + if (((Elf_Sword)tmp > 0x7fff) || ((Elf_Sword)tmp < -0x8000)) { + printf("MOVT_ABS Overflow\n"); + return false; + } + } + + *where = (insn & 0xfff0f000) | ((tmp & 0xf000) << 4) | (tmp & 0xfff); + + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) + printf ("rtl: MOVT_ABS/MOVW_ABS_NC %p @ %p in %s\n", + (void *)*where, where, rtems_rtl_obj_oname (obj)); + break; + + + case R_TYPE(REL32): /* word32 (S + A) | T - P */ + case R_TYPE(ABS32): /* word32 (S + A) | T */ + case R_TYPE(GLOB_DAT): /* word32 (S + A) | T */ + if (__predict_true(RELOC_ALIGNED_P(where))) { + tmp = *where + symvalue; + if (isThumb(symvalue)) + tmp |= 1; + if (ELF_R_TYPE(rel->r_info) == R_TYPE(REL32)) + tmp -= (Elf_Addr)where; + *where = tmp; + } else { + tmp = load_ptr(where) + symvalue; + if (isThumb(symvalue)) tmp |= 1; - *where = tmp; - } else { - tmp = load_ptr(where) + symvalue; - /* Set the Thumb bit, if needed. */ - if (ELF_ST_TYPE(syminfo) == STT_ARM_TFUNC) - tmp |= 1; - store_ptr(where, tmp); - } + if (ELF_R_TYPE(rel->r_info) == R_TYPE(REL32)) + tmp -= (Elf_Addr)where; + store_ptr(where, tmp); + } + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) - printf ("rtl: ABS32/GLOB_DAT %p @ %p in %s", + printf ("rtl: REL32/ABS32/GLOB_DAT %p @ %p in %s", (void *)tmp, where, rtems_rtl_obj_oname (obj)); - break; + break; - case R_TYPE(RELATIVE): /* word32 B + A */ - if (__predict_true(RELOC_ALIGNED_P(where))) { - tmp = *where + (Elf_Addr)sect->base; - *where = tmp; - } else { - tmp = load_ptr(where) + (Elf_Addr)sect->base; - store_ptr(where, tmp); - } - if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) - printf ("rtl: RELATIVE in %s --> %p", - rtems_rtl_obj_oname (obj), (void *)tmp); - break; + case R_TYPE(THM_MOVT_ABS): + case R_TYPE(THM_MOVW_ABS_NC): + upper_insn = *(uint16_t *)where; + lower_insn = *((uint16_t *)where + 1); + + addend = ((upper_insn & 0x000f) << 12) | ((upper_insn & 0x0400) << 1) | + ((lower_insn & 0x7000) >> 4) | (lower_insn & 0x00ff); + addend = (addend ^ 0x8000) - 0x8000; + + tmp = addend + symvalue; + if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_ABS) + tmp >>= 16; + + *(uint16_t *)where = (uint16_t)((upper_insn & 0xfbf0) | + ((tmp & 0xf000) >> 12) | + ((tmp & 0x0800) >> 1)); + *((uint16_t *)where + 1) = (uint16_t)((lower_insn & 0x8f00) | + ((tmp & 0x0700) << 4) | + (tmp & 0x00ff)); + + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) { + printf ("rtl: THM_MOVT_ABS/THM_MOVW_ABS_NC %p @ %p in %s\n", + (void *)*where, where, rtems_rtl_obj_oname (obj)); + } + + break; + + case R_TYPE(THM_JUMP24): + /* same to THM_CALL; insn b.w */ + case R_TYPE(THM_CALL): + upper_insn = *(uint16_t *)where; + lower_insn = *((uint16_t *)where + 1); + sign = (upper_insn & (1 << 10)) >> 10; + i1 = ((lower_insn >> 13) & 1) ^ sign ? 0 : 1; + i2 = ((lower_insn >> 11) & 1) ^ sign ? 0 : 1; + tmp = (i1 << 23) | (i2 << 22) | ((upper_insn & 0x3ff) << 12) | ((lower_insn & 0x7ff) << 1); + addend = (tmp | ((sign ? 0 : 1) << 24)) - (1 << 24); + + if (isThumb(symvalue)) ;/*Thumb to Thumb call, nothing to care */ + else { + if (ELF_R_TYPE(rel->r_info) == R_TYPE(THM_JUMP24)) { + tmp = (tmp + 2) & ~3; /* aligned to 4 bytes only for JUMP24 */ + printf("THM_JUMP24 to arm not supported\n"); + return false; + } + else { + /* THM_CALL bl-->blx */ + lower_insn &=~(1<<12); + } + } + + tmp = symvalue + addend; + tmp = tmp - (Elf_Addr)where; + + if (((Elf_Sword)tmp > 0x7fffff) || ((Elf_Sword)tmp < -0x800000)) { + printf("THM_CALL/JUMP24 overflow\n"); + return false; + } + + sign = (tmp >> 24) & 1; + *(uint16_t *)where = (uint16_t)((upper_insn & 0xf800) | (sign << 10) | + ((tmp >> 12) & 0x3ff)); + + *((uint16_t *)where + 1) = (uint16_t)((lower_insn & 0xd000)| + ((sign ^ (~(tmp >> 23) & 1)) << 13) | + ((sign ^ (~(tmp >> 22) & 1)) << 11) | + ((tmp >> 1) & 0x7ff)); + + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)){ + printf ("rtl: THM_CALL/JUMP24 %p @ %p in %s\n", + (void *)*where, where, rtems_rtl_obj_oname (obj)); + } + + break; + + case R_TYPE(THM_JUMP19): + + if (!isThumb(symvalue)) { + printf("THM_JUMP19 to arm not supported\n"); + return false; + } + + upper_insn = *(uint16_t *)where; + lower_insn = *((uint16_t *)where + 1); + sign = (upper_insn >> 10) & 0x1; + + if ((((upper_insn & 0x3f) >> 7) & 0x7) == 0x7) { + printf("THM_JUMP19 failed\n"); + return false; /*if cond <3:1> == '111', see Related codings in armv7a manual */ + } + + i1 = (lower_insn >> 13) & 0x1; + i2 = (lower_insn >> 11) & 0x1; + + tmp = ((i2 << 19) | (i1 << 18) | ((upper_insn & 0x3f) << 12) | ((lower_insn & 0x7ff) << 1)); + addend = (tmp | ((sign ? 0 : 1) << 20)) - (1 << 20); + tmp = symvalue + addend; + + tmp = tmp - (Elf_Addr)where; + + if (((Elf_Sword)tmp > 0x7ffffe) || ((Elf_Sword)tmp < -0x800000)) { + rtems_rtl_set_error (EINVAL, "%s: Overflow %ld " + "THM_JUMP19 relocations", + sect->name, (uint32_t) ELF_R_TYPE(rel->r_info)); + return false; + } + + sign = (tmp >> 20) & 0x1; + i2 = (tmp >> 19) & 0x1; + i1 = (tmp >> 18) & 0x1; + + *(uint16_t*)where = (upper_insn & 0xfbc0) | (sign << 10) | ((tmp >> 12) & 0x3f); + *((uint16_t*)where + 1) = (lower_insn & 0xd000) | (i1 << 13) | + (i2 << 11) | ((tmp >> 1) & 0x7ff); - case R_TYPE(COPY): - /* - * These are deferred until all other relocations have - * been done. All we do here is make sure that the - * COPY relocation is not in a shared library. They - * are allowed only in executable files. - */ if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) - printf ("rtl: COPY (avoid in main)"); - break; + printf ("rtl: THM_JUMP19 %p @ %p in %s\n", + (void *)*where, where, rtems_rtl_obj_oname (obj)); + break; default: printf ("rtl: reloc unknown: sym = %lu, type = %lu, offset = %p, " diff --git a/testcase/1.c b/testcase/1.c new file mode 100644 index 0000000..e8a1241 --- /dev/null +++ b/testcase/1.c @@ -0,0 +1,106 @@ +int global; +static char local; + +void hello(int arg) +{ + switch (arg) { + case 1: + printf("Inner-module call hello()\n"); + break; + case 2: + printf("Inter-module call hello()\n"); + break; + default: + return; + } +} + +#if defined (__arm__) +int rtems_arm(int arg) +{ + switch (arg) { + case 24: + printf("R_ARM_JUMP24: arg = 24\n"); + break; + } + return 0; +} + +int rtems_thumb(int arg) +{ + switch (arg) { + case 19: + printf("R_ARM_THM_JUMP19: arg = 19\n"); + break; + case 24: + printf("R_ARM_THM_JUMP24: arg = 24\n"); + break; + } + return 0; +} +#endif + +/* This is the init entry, Because init() use "blx", it is not needed + * to handle arm/thumb switch here + */ +int rtems(int argc, char **argv) +{ + local = 1; + printf("In rtems() local = %d\n", local); //inner-module data access + hello(1); //inner-module call + test(argc, argv); + +#if defined (__arm__) +#ifdef THUMB_TEST + __asm__ volatile ( + "push {r0}\r\n" + "push {lr}\r\n" + "mov r0, #19\r\n" + "cmp r0, #19\r\n" + "mov lr, pc\r\n" + "add lr, #7\r\n" + "beq rtems_thumb\r\n" /*THM_JUMP19*/ + "nop\r\n" + "nop\r\n" + "nop\r\n" + "nop\r\n" + "pop {lr}\r\n" + "pop {r0}\r\n" + ); + __asm__ volatile ( + "push {r0}\r\n" + "push {lr}\r\n" + "mov r0, #24\r\n" + "mov lr, pc\r\n" + "add lr, #7\r\n" + "b.w rtems_thumb\r\n" /*THM_JUMP24*/ + "nop\r\n" + "nop\r\n" + "nop\r\n" + "nop\r\n" + "pop {lr}\r\n" + "pop {r0}\r\n" + ); +#elif defined ARM_TEST + /*arm instruction test*/ + __asm__ volatile ( + "push {r0}\r\n" + "push {lr}\r\n" + "mov r0, #24\r\n" + "mov lr, pc\r\n" + "add lr, #4\r\n" + "b rtems_arm\r\n" /*JUMP24*/ + "nop\r\n" + "nop\r\n" + "nop\r\n" + "nop\r\n" + "pop {lr}\r\n" + "pop {r0}\r\n" + ); +#endif + +#else + /* other archs */ +#endif + return 0; +} diff --git a/testcase/2.c b/testcase/2.c new file mode 100644 index 0000000..a63c1c7 --- /dev/null +++ b/testcase/2.c @@ -0,0 +1,14 @@ +extern int global; +extern void hello(int); + +int test(int argc, char **argv) +{ + global = 1; //inter-module data access + printf("In test() global = %d\n", global); + hello(2); //inter-module call +} + +int my_main(int argc, char **argv) +{ + exit(0); +} diff --git a/testcase/Readme b/testcase/Readme new file mode 100644 index 0000000..1312f60 --- /dev/null +++ b/testcase/Readme @@ -0,0 +1,11 @@ +==================== +arm: + Simulator: + qemu-system-arm -no-reboot -net none -nographic -M realview-pbx-a9 -m 256M -kernel build/arm-rtems4.11-realview_pbx_a9_qemu/rtld + add "-S -s" option and you can use gdbserver to debug rtld + use "halt" to exit qemu. + + Configuration: + waf configure --rtems=/opt/rtems-4.11 --rtems-tools=/opt/rtems-4.11 --rtems-archs=arm --rtems-bsps=arm/realview_pbx_a9_qemu + + In the wscript, you can use different cflags to test. diff --git a/testcase/wscript b/testcase/wscript new file mode 100644 index 0000000..a518cb6 --- /dev/null +++ b/testcase/wscript @@ -0,0 +1,32 @@ +import re +import rtems + +def build(bld): + arch = bld.get_env()['RTEMS_ARCH'] + + bld(target = 'x', + features = 'c cstlib', + includes = bld.includes, + defines = bld.defines, + source = ['1.c', '2.c']) + +# Note: the bsp is compiled in thumb mode +# The follow cflags is to test arm/thumb reloc code. +# cflags = '-marm -fno-common -DARM_TEST', +# cflags = '-mthumb -fno-common -DTHUMB_TEST', +# cflags = '-marm -mcpu=arm1176jzf-s -fno-common -DARM_TEST', + + if arch == 'arm': + bld(target = 'test.rap', + features = 'c rap', + xxxx = 'hello', + + cflags = '-mthumb -fno-common -DTHUMB_TEST', + + rtems_linkflags = ['--base', 'rtld.prelink', + '--entry', 'my_main'], + source = ['1.c', '2.c']) + + bld(target = '../test.rap', + source = ['test.rap'], + rule = 'cp ${SRC} ${TGT}') @@ -145,7 +145,7 @@ def build(bld): # bld(target = 'fs-root.tar', source = ['shell-init', 'libx.a'], - rule = 'tar cf - ${SRC} > ${TGT}') + rule = 'tar --format=ustar -cf ${TGT} ${SRC}') bld.objects(name = 'rootfs.prelink', target = 'fs-root-tarfile.o', source = 'fs-root.tar', @@ -181,6 +181,8 @@ def build(bld): source = ['xa.c', 'x-long-name-to-create-gnu-extension-in-archive.c']) + bld.recurse('testcase'); + if re.match('pc[3456]86', bsp) is not None: raps = ['bsdport.rap'] else: @@ -188,8 +190,8 @@ def build(bld): bld(target = 'fs-root.tar', name = 'fs', - source = ['shell-init', 'libx.a', 'x.rap'] + raps, - rule = 'tar cf - ${SRC} > ${TGT}') + source = ['shell-init', 'libx.a', 'x.rap', 'test.rap'] + raps, + rule = 'tar --format=ustar -cf ${TGT} ${SRC}') bld.objects(name = 'rootfs', target = 'fs-root-tarfile.o', source = 'fs-root.tar', |