refactor(arch): extract hermit-entry-specific start code

[mkroening]

Extracted from #2546.

[github-actions]

Benchmark Results

Details

Benchmark	Current: d752a02	Previous: 2e23902	Performance Ratio
startup_benchmark Build Time	80.31 s	80.34 s	1.00 ❗
startup_benchmark File Size	0.79 MB	0.80 MB	1.00 ❗
Startup Time - 1 core	0.76 s (±0.02 s)	0.75 s (±0.02 s)	1.01
Startup Time - 2 cores	0.77 s (±0.02 s)	0.74 s (±0.02 s)	1.04 ❗
Startup Time - 4 cores	0.79 s (±0.02 s)	0.74 s (±0.02 s)	1.06 ❗
multithreaded_benchmark Build Time	83.28 s	82.11 s	1.01 ❗
multithreaded_benchmark File Size	0.89 MB	0.86 MB	1.04 ❗
Multithreaded Pi Efficiency - 2 Threads	88.24 % (±8.69 %)	85.89 % (±6.61 %)	1.03
Multithreaded Pi Efficiency - 4 Threads	43.41 % (±2.87 %)	43.43 % (±2.56 %)	1.00
Multithreaded Pi Efficiency - 8 Threads	25.51 % (±1.83 %)	25.76 % (±1.53 %)	0.99
micro_benchmarks Build Time	77.36 s	80.40 s	0.96 ❗
micro_benchmarks File Size	0.90 MB	0.86 MB	1.04 ❗
Scheduling time - 1 thread	64.78 ticks (±3.34 ticks)	62.65 ticks (±4.06 ticks)	1.03
Scheduling time - 2 threads	36.60 ticks (±4.98 ticks)	34.08 ticks (±4.10 ticks)	1.07
Micro - Time for syscall (getpid)	3.35 ticks (±0.70 ticks)	3.45 ticks (±0.58 ticks)	0.97
Memcpy speed - (built_in) block size 4096	83607.36 MByte/s (±57810.11 MByte/s)	82448.38 MByte/s (±56997.13 MByte/s)	1.01
Memcpy speed - (built_in) block size 1048576	30334.80 MByte/s (±24412.18 MByte/s)	30585.98 MByte/s (±24707.84 MByte/s)	0.99
Memcpy speed - (built_in) block size 16777216	29091.30 MByte/s (±23897.82 MByte/s)	26340.06 MByte/s (±21720.96 MByte/s)	1.10
Memset speed - (built_in) block size 4096	83223.15 MByte/s (±57565.27 MByte/s)	82292.76 MByte/s (±56891.50 MByte/s)	1.01
Memset speed - (built_in) block size 1048576	31071.78 MByte/s (±24844.66 MByte/s)	31323.85 MByte/s (±25145.86 MByte/s)	0.99
Memset speed - (built_in) block size 16777216	29840.31 MByte/s (±24330.10 MByte/s)	27104.68 MByte/s (±22209.94 MByte/s)	1.10
Memcpy speed - (rust) block size 4096	74299.94 MByte/s (±51857.32 MByte/s)	74097.96 MByte/s (±51811.44 MByte/s)	1.00
Memcpy speed - (rust) block size 1048576	30138.15 MByte/s (±24437.15 MByte/s)	30361.60 MByte/s (±24602.37 MByte/s)	0.99
Memcpy speed - (rust) block size 16777216	29235.05 MByte/s (±24043.68 MByte/s)	27625.34 MByte/s (±22806.88 MByte/s)	1.06
Memset speed - (rust) block size 4096	74706.35 MByte/s (±52149.56 MByte/s)	74373.47 MByte/s (±51976.48 MByte/s)	1.00
Memset speed - (rust) block size 1048576	30908.37 MByte/s (±24877.06 MByte/s)	31110.89 MByte/s (±25033.24 MByte/s)	0.99
Memset speed - (rust) block size 16777216	29995.07 MByte/s (±24478.17 MByte/s)	28386.93 MByte/s (±23265.03 MByte/s)	1.06
alloc_benchmarks Build Time	78.77 s	74.76 s	1.05 ❗
alloc_benchmarks File Size	0.87 MB	0.87 MB	1.00 ❗
Allocations - Allocation success	91.31 %	91.31 %	1
Allocations - Deallocation success	100.00 %	100.00 %	1
Allocations - Pre-fail Allocations	61.44 %	61.44 %	1
Allocations - Average Allocation time	4549.84 Ticks (±138.41 Ticks)	5860.58 Ticks (±98.43 Ticks)	0.78 ❗
Allocations - Average Allocation time (no fail)	5365.92 Ticks (±131.56 Ticks)	6554.81 Ticks (±92.86 Ticks)	0.82 ❗
Allocations - Average Deallocation time	1323.36 Ticks (±136.58 Ticks)	1805.01 Ticks (±250.35 Ticks)	0.73 ❗
mutex_benchmark Build Time	78.24 s	79.82 s	0.98 ❗
mutex_benchmark File Size	0.90 MB	0.86 MB	1.04 ❗
Mutex Stress Test Average Time per Iteration - 1 Threads	12.14 ns (±0.40 ns)	12.10 ns (±0.41 ns)	1.00
Mutex Stress Test Average Time per Iteration - 2 Threads	39.60 ns (±2.15 ns)	40.26 ns (±1.68 ns)	0.98

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