From: Zhangjin Wu <falcon@tinylab.org> To: thomas@t-8ch.de, w@1wt.eu Cc: falcon@tinylab.org, arnd@arndb.de, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-riscv@lists.infradead.org Subject: [PATCH v1 09/11] tools/nolibc: loongarch: shrink _start with _start_c Date: Thu, 29 Jun 2023 03:02:29 +0800 [thread overview] Message-ID: <3304844b9d5c02416d08aaffd2f009941b38163c.1687976753.git.falcon@tinylab.org> (raw) In-Reply-To: <cover.1687976753.git.falcon@tinylab.org> Let's move most of the _start operations to _start_c(). Signed-off-by: Zhangjin Wu <falcon@tinylab.org> --- tools/include/nolibc/arch-loongarch.h | 42 +++------------------------ 1 file changed, 4 insertions(+), 38 deletions(-) diff --git a/tools/include/nolibc/arch-loongarch.h b/tools/include/nolibc/arch-loongarch.h index fbb4844f7993..f5cac2e81a13 100644 --- a/tools/include/nolibc/arch-loongarch.h +++ b/tools/include/nolibc/arch-loongarch.h @@ -145,26 +145,9 @@ _arg1; \ }) -char **environ __attribute__((weak)); -const unsigned long *_auxv __attribute__((weak)); - #if __loongarch_grlen == 32 -#define LONGLOG "2" -#define SZREG "4" -#define REG_L "ld.w" -#define LONG_S "st.w" -#define LONG_ADD "add.w" -#define LONG_ADDI "addi.w" -#define LONG_SLL "slli.w" #define LONG_BSTRINS "bstrins.w" #else /* __loongarch_grlen == 64 */ -#define LONGLOG "3" -#define SZREG "8" -#define REG_L "ld.d" -#define LONG_S "st.d" -#define LONG_ADD "add.d" -#define LONG_ADDI "addi.d" -#define LONG_SLL "slli.d" #define LONG_BSTRINS "bstrins.d" #endif @@ -173,28 +156,11 @@ void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) __no_stack_pr { __asm__ volatile ( #ifdef _NOLIBC_STACKPROTECTOR - "bl __stack_chk_init\n" /* initialize stack protector */ + "bl __stack_chk_init\n" /* initialize stack protector */ #endif - REG_L " $a0, $sp, 0\n" /* argc (a0) was in the stack */ - LONG_ADDI " $a1, $sp, "SZREG"\n" /* argv (a1) = sp + SZREG */ - LONG_SLL " $a2, $a0, "LONGLOG"\n" /* envp (a2) = SZREG*argc ... */ - LONG_ADDI " $a2, $a2, "SZREG"\n" /* + SZREG (skip null) */ - LONG_ADD " $a2, $a2, $a1\n" /* + argv */ - - "move $a3, $a2\n" /* iterate a3 over envp to find auxv (after NULL) */ - "0:\n" /* do { */ - REG_L " $a4, $a3, 0\n" /* a4 = *a3; */ - LONG_ADDI " $a3, $a3, "SZREG"\n" /* a3 += sizeof(void*); */ - "bne $a4, $zero, 0b\n" /* } while (a4); */ - "la.pcrel $a4, _auxv\n" /* a4 = &_auxv */ - LONG_S " $a3, $a4, 0\n" /* store a3 into _auxv */ - - "la.pcrel $a3, environ\n" /* a3 = &environ */ - LONG_S " $a2, $a3, 0\n" /* store envp(a2) into environ */ - LONG_BSTRINS " $sp, $zero, 3, 0\n" /* sp must be 16-byte aligned */ - "bl main\n" /* main() returns the status code, we'll exit with it. */ - "li.w $a7, 93\n" /* NR_exit == 93 */ - "syscall 0\n" + "move $a0, $sp\n" /* save stack pointer to a0, as arg1 of _start_c*/ + LONG_BSTRINS " $sp, $zero, 3, 0\n" /* sp must be 16-byte aligned */ + "bl _start_c\n" /* transfer to c runtime */ ); __builtin_unreachable(); } -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Zhangjin Wu <falcon@tinylab.org> To: thomas@t-8ch.de, w@1wt.eu Cc: falcon@tinylab.org, arnd@arndb.de, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-riscv@lists.infradead.org Subject: [PATCH v1 09/11] tools/nolibc: loongarch: shrink _start with _start_c Date: Thu, 29 Jun 2023 03:02:29 +0800 [thread overview] Message-ID: <3304844b9d5c02416d08aaffd2f009941b38163c.1687976753.git.falcon@tinylab.org> (raw) In-Reply-To: <cover.1687976753.git.falcon@tinylab.org> Let's move most of the _start operations to _start_c(). Signed-off-by: Zhangjin Wu <falcon@tinylab.org> --- tools/include/nolibc/arch-loongarch.h | 42 +++------------------------ 1 file changed, 4 insertions(+), 38 deletions(-) diff --git a/tools/include/nolibc/arch-loongarch.h b/tools/include/nolibc/arch-loongarch.h index fbb4844f7993..f5cac2e81a13 100644 --- a/tools/include/nolibc/arch-loongarch.h +++ b/tools/include/nolibc/arch-loongarch.h @@ -145,26 +145,9 @@ _arg1; \ }) -char **environ __attribute__((weak)); -const unsigned long *_auxv __attribute__((weak)); - #if __loongarch_grlen == 32 -#define LONGLOG "2" -#define SZREG "4" -#define REG_L "ld.w" -#define LONG_S "st.w" -#define LONG_ADD "add.w" -#define LONG_ADDI "addi.w" -#define LONG_SLL "slli.w" #define LONG_BSTRINS "bstrins.w" #else /* __loongarch_grlen == 64 */ -#define LONGLOG "3" -#define SZREG "8" -#define REG_L "ld.d" -#define LONG_S "st.d" -#define LONG_ADD "add.d" -#define LONG_ADDI "addi.d" -#define LONG_SLL "slli.d" #define LONG_BSTRINS "bstrins.d" #endif @@ -173,28 +156,11 @@ void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) __no_stack_pr { __asm__ volatile ( #ifdef _NOLIBC_STACKPROTECTOR - "bl __stack_chk_init\n" /* initialize stack protector */ + "bl __stack_chk_init\n" /* initialize stack protector */ #endif - REG_L " $a0, $sp, 0\n" /* argc (a0) was in the stack */ - LONG_ADDI " $a1, $sp, "SZREG"\n" /* argv (a1) = sp + SZREG */ - LONG_SLL " $a2, $a0, "LONGLOG"\n" /* envp (a2) = SZREG*argc ... */ - LONG_ADDI " $a2, $a2, "SZREG"\n" /* + SZREG (skip null) */ - LONG_ADD " $a2, $a2, $a1\n" /* + argv */ - - "move $a3, $a2\n" /* iterate a3 over envp to find auxv (after NULL) */ - "0:\n" /* do { */ - REG_L " $a4, $a3, 0\n" /* a4 = *a3; */ - LONG_ADDI " $a3, $a3, "SZREG"\n" /* a3 += sizeof(void*); */ - "bne $a4, $zero, 0b\n" /* } while (a4); */ - "la.pcrel $a4, _auxv\n" /* a4 = &_auxv */ - LONG_S " $a3, $a4, 0\n" /* store a3 into _auxv */ - - "la.pcrel $a3, environ\n" /* a3 = &environ */ - LONG_S " $a2, $a3, 0\n" /* store envp(a2) into environ */ - LONG_BSTRINS " $sp, $zero, 3, 0\n" /* sp must be 16-byte aligned */ - "bl main\n" /* main() returns the status code, we'll exit with it. */ - "li.w $a7, 93\n" /* NR_exit == 93 */ - "syscall 0\n" + "move $a0, $sp\n" /* save stack pointer to a0, as arg1 of _start_c*/ + LONG_BSTRINS " $sp, $zero, 3, 0\n" /* sp must be 16-byte aligned */ + "bl _start_c\n" /* transfer to c runtime */ ); __builtin_unreachable(); } -- 2.25.1 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv
next prev parent reply other threads:[~2023-06-28 19:04 UTC|newest] Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-06-28 18:50 [PATCH v1 00/11] tools/nolibc: shrink arch support Zhangjin Wu 2023-06-28 18:50 ` Zhangjin Wu 2023-06-28 18:51 ` [PATCH v1 01/11] tools/nolibc: remove old arch specific stat support Zhangjin Wu 2023-06-28 18:51 ` Zhangjin Wu 2023-06-28 18:53 ` [PATCH v1 02/11] tools/nolibc: add new crt.h with _start_c Zhangjin Wu 2023-06-28 18:53 ` Zhangjin Wu 2023-06-28 18:54 ` [PATCH v1 03/11] tools/nolibc: include crt.h before arch.h Zhangjin Wu 2023-06-28 18:54 ` Zhangjin Wu 2023-07-02 18:57 ` Thomas Weißschuh 2023-07-02 18:57 ` Thomas Weißschuh 2023-07-03 9:58 ` Zhangjin Wu 2023-07-03 9:58 ` Zhangjin Wu 2023-07-03 10:11 ` Thomas Weißschuh 2023-07-03 10:11 ` Thomas Weißschuh 2023-07-03 14:55 ` Zhangjin Wu 2023-07-03 14:55 ` Zhangjin Wu 2023-06-28 18:55 ` [PATCH v1 04/11] tools/nolibc: arm: shrink _start with _start_c Zhangjin Wu 2023-06-28 18:55 ` Zhangjin Wu 2023-06-28 18:57 ` [PATCH v1 05/11] tools/nolibc: aarch64: " Zhangjin Wu 2023-06-28 18:57 ` Zhangjin Wu 2023-06-28 18:58 ` [PATCH v1 06/11] tools/nolibc: i386: " Zhangjin Wu 2023-06-28 18:58 ` Zhangjin Wu 2023-06-28 18:59 ` [PATCH v1 07/11] tools/nolibc: x86_64: " Zhangjin Wu 2023-06-28 18:59 ` Zhangjin Wu 2023-06-28 19:01 ` [PATCH v1 08/11] tools/nolibc: mips: " Zhangjin Wu 2023-06-28 19:01 ` Zhangjin Wu 2023-06-28 19:02 ` Zhangjin Wu [this message] 2023-06-28 19:02 ` [PATCH v1 09/11] tools/nolibc: loongarch: " Zhangjin Wu 2023-06-28 19:04 ` [PATCH v1 10/11] tools/nolibc: riscv: " Zhangjin Wu 2023-06-28 19:04 ` Zhangjin Wu 2023-06-28 19:06 ` [PATCH v1 11/11] tools/nolibc: s390: " Zhangjin Wu 2023-06-28 19:06 ` Zhangjin Wu
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